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EMF JSON mapper at!

by Jonas Helming and Maximilian Koegel at November 30, 2020 12:27 PM

Do you want to convert EMF model instances into JSON or vice versa? Do you want to make EMF data available...

The post EMF JSON mapper at! appeared first on EclipseSource.

by Jonas Helming and Maximilian Koegel at November 30, 2020 12:27 PM

Add SpotBugs support to Eclipse, Maven, and Jenkins

by Christian Pontesegger ( at November 24, 2020 06:01 PM

SpotBugs (successor of FindBugs) is a tool for static code analysis, similar like PMD. Both tools help to detect bad code constructs which might need improvement. As they partly detect different issues, they may be well combined and used simultaneously.

Step 1: Add Eclipse IDE Support

The SpotBugs Eclipse Plugin can be installed directly via the Eclipse Marketplace.

After installation projects can be configured to use it from the projects Properties context menu. Navigate to the SpotBugs category and enable all checkboxes on the main site. Further set Minimum rank to report to 20 and Minimum confidence to report to Low.

Once done SpotBugs immediately scans the project for problems. Found issues are displayed as custom markers in editors. Further they are visible in the Bug Explorer view as well as in the Problems view.

SpotBugs also comes with a label decoration on elements in the Package Explorer. If you do not like these then disable all Bug count decorator entries in Preferences/General/Appearance/Label Decorations.

Step 2: Maven Integration

Integration is done via the SpotBugs Maven Plugin. To enable, add following section to your master pom:


<!-- enable spotbugs code analysis -->



The execution entry takes care that the spotbugs goal is automatically executed during the verify phase. If you remove the execution section you would have to call the spotbugs goal separately:

mvn spotbugs:spotbugs

Step 3: File Exclusions

You might have code that you do not want to get checked (eg generated files). Exclusions need to be defined in an xml file. A simple filter on package level looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<!-- skip EMF generated packages -->
<Package name="~org\.eclipse\.skills\.model.*" />

See the documentation for a full description of filter definitions.

Once defined this file can be used from the SpotBugs Eclipse plugin as well as from the maven setup.

To simplify the maven configuration we can add following profile to our master pom:

<!-- apply filter when filter file exists -->

<!-- enable spotbugs exclude filter -->


It gets automatically enabled when a file .settings/spotbugs-exclude.xml exists in the current project.

Step 4: Jenkins Integration

Like with PMD, we again use the warnings-ng plugin on Jenkins to track our findings:

	recordIssues tools: [spotBugs(useRankAsPriority: true)]

Try out the live chart on the skills project.

Final Thoughts

PMD is smoother on integration as it stores its rulesets in a common file which can be shared by maven and the Eclipse plugin. SpotBugs currently requires to manage rulesets separately. Still both can be implemented in a way that users automatically get the same warnings in maven and the IDE.

by Christian Pontesegger ( at November 24, 2020 06:01 PM

Eclipse Vert.x 4 CR2 released!

by vietj at November 24, 2020 12:00 AM

We are extremely pleased to announce the first release candidate of Vert.x 4.0 .

We consider Vert.x 4.0 as feature complete and we will do a few release candidates to allow the community to test it and report issues.

Vert.x 4 is the evolution of the Vert.x 3.x series that will bring key features to Vert.x.

Since this release candidate we have created a new HomeBrew distribution with a custom thirdparty repository (TAP) and a vertx4 formula:

> brew tap vertx-distrib/tap
> brew install vertx4

This is the second relase candidate of Vert.x 4, you can of course expect more as we get feedback from the community and fix issues that we failed to catch before.

You can also read the previous announces to know more about the overral changes:

The deprecations and breaking changes can be found on the wiki.

For this release there are no Docker images.

The release artifacts have been deployed to Maven Central and you can get the distribution on Maven Central.

You can bootstrap a Vert.x 4.0.0.CR2 project using

The documentation has been deployed on this preview web-site

That’s it! Happy coding and see you soon on our user or dev channels.

by vietj at November 24, 2020 12:00 AM

How to deploy Eclipse Dirigible private Docker image in the SAP Cloud Platform Kyma environment

by Yordan Pavlov at November 24, 2020 12:00 AM

Starting with Eclipse Dirigible 5.0, there are built-in integrations with the SAP Cloud Platform Cloud Foundry and Kyma environments. To deploy Eclipse Dirigible on either one of these environments, you need to use a Docker image. In this tutorial, I’m going to show you how to deploy Eclipse Dirigible based Docker image from a private Docker repository …

To read the whole article go to: How to deploy Eclipse Dirigible private Docker image in the SAP Cloud Platform Kyma environment

by Yordan Pavlov at November 24, 2020 12:00 AM

Eclipse Dirigible – SAP Identity and Authentication Service Integration on the SAP Cloud Platform

by Yordan Pavlov at November 24, 2020 12:00 AM

Starting with Eclipse Dirigible 5.0, there are built-in integrations with the SAP Cloud Platform Cloud Foundry and Kyma environments. Beyond the most basic configuration with the default Identity Provider, there are plenty of use cases where integration with the SAP Identity and Authentication Service is needed …

To read the whole article go to: Eclipse Dirigible – SAP Identity and Authentication Service Integration on the SAP Cloud Platform

by Yordan Pavlov at November 24, 2020 12:00 AM

My main update site moved

by Andrey Loskutov ( at November 23, 2020 08:51 AM

My host provider GMX decided that free hosting that they offered for over a decade is not fitting to their portfolio  anymore (for some security reasons) and simply switched my domain off.


... aus Sicherheitsgründen modernisieren wir regelmäßig unser Produktportfolio.
Im Zuge dessen möchten wir Sie darüber informieren, dass wir Ihren Webspace mit Ihrem Subdomain-Namen zum 19‌.11‌.20‌20 kündigen. 

Because of that, Eclipse update site for all my plugins is moved now: 



Same way, my "home" is moved to

(Github obviously has no issues with free hosting).

That means, anyone who used to have my main update site in scripts / Oomph setups, has to change them to use instead.

I'm sorry for that, but that is nothing I could change.

by Andrey Loskutov ( at November 23, 2020 08:51 AM

Heaven’s Gate

by Donald Raab at November 23, 2020 03:01 AM

A poem about the finality of life.

Photo taken in Kauai, Hawaii with moon behind clouds


This is the first poem I ever wrote. It is about the sense of helplessness and loss of control everyone may feel in the final moments of their life. The poem was published in my high school literary magazine in 1987.

Heaven’s Gate

Here I am,
Moving? No.
Lost in time;
time so slow

A breath of wind,
too soon I fear.
Heartbeat withering,
for death is near.

Upon a table
troubled will.
Breathing rapid,
fighting still.

My life before me
in mind’s eye.
Nothing accomplished
before I die.

God have mercy
on me I pray.
Forgive my sins
of yesterday.

-Donald Raab

Reflections on living the life you’re given

The poem may seem dark, sad and depressing, but there is a motivational message in the words. Minimize your regrets. Be kind. Complete things. Appreciate the little things. Celebrate a win every day. You do more than you realize. You are more important than you realize.

Photo taken right before landing in Atlanta

by Donald Raab at November 23, 2020 03:01 AM

Add Code Coverage Reports to Eclipse, Maven, and Jenkins

by Christian Pontesegger ( at November 20, 2020 10:53 AM

Code coverage may provide some insights in your tests. They show which classes, lines of codes, and conditional branches are called by your tests. A high percentage of coverage does not automatically mean that your tests are great - as you might not have a single assertion in your test code - but at least they can give you an impression of dark areas in your code base.

This article is heavily based on the article of Lorenzo Bettini on JaCoCo Code Coverage and Report of multiple Eclipse plug-in projects, so the credits for this setup are his!

Step 1: Eclipse IDE Setup

Coverage in Java projects is typically tracked with the JaCoCo library. The according plugin for Eclipse is called EclEmma and is available via the Eclipse Marketplace.

After installation you have a new run target 

that adds coverage information to your execution. Only thing to do is to rerun your unit tests and check out the Coverage view.

Multiple coverage sessions can be combined into one. That allows to accumulate the results of multiple unit tests into a single coverage report.

Step 2: Tycho integration

For the next steps I expect that you basically followed my tycho tutorials and have a similar setup.

First we need to enable JaCoCo in our builds:

<!-- enable JaCoCo code coverage -->



Tycho surefire executes unit tests in the maven integration-test phase, therefore we start the agent right before. This plugin needs to be active for any plugin of type eclipse-plugin-test (see tycho tutorial), but it is safe to put it in the master pom of your *.releng project.

Now each test run creates coverage reports. For analysis purposes we need to merge them into a single one. Therefore create a new General/Project in your workspace, named *.releng.coverage. In the pom.xml file we need to add a step to aggregate all reports into one:


Afterwards we need to define dependencies for the projects containing our source code:

<!-- Code dependencies to show coverage on -->


Further we need dependencies to our test fragments (mind the different scope) :

<!-- Test dependencies -->


If unsure, have a look at a complete pom file.

Finally add the new project as a module to your master pom:


The maven build now generates *.releng.coverage/target/site/jacoco-aggregate/jacoco.xml which can be picked up by various tools. Further you get a nice HTML report in the same folder for free.

Step 3: Jenkins reports

While you may directly publish the HTML report on your jenkins builds, I prefer to use the Code Coverage plugin. With a single instruction in your pipeline

	publishCoverage adapters: [jacocoAdapter(path: 'releng/com.example.releng.coverage/target/site/jacoco-aggregate/jacoco.xml')], sourceFileResolver: sourceFiles('STORE_LAST_BUILD')

it generates nice, interactive reports like these:

You may also have a look at this live report to play around with.

by Christian Pontesegger ( at November 20, 2020 10:53 AM

Member Case Study: Payara Services Joins Industry Leaders

by Thabang Mashologu at November 17, 2020 03:40 PM

One of our mandates at the Eclipse Foundation is to communicate the differentiated value proposition and broad benefits we deliver to our members. No one can describe the unique entrepreneurial opportunities and advantages offered by the Eclipse ecosystem better than our members themselves. 

We recently asked several members to tell us why they joined the Eclipse Foundation and what their membership means for their business. We captured their input in a series of case studies so prospective members can learn from their experiences. We’ll be sharing the case studies with you, starting today with the Payara Services story. 

Payara Services joined the Eclipse Foundation in 2017 after Oracle announced it was contributing Java EE and related GlassFish technologies to the Eclipse Foundation. The company’s flagship product, Payara Server Enterprise, is based on Eclipse GlassFish, so it was a logical move to participate in Jakarta EE, the successor to Java EE. Membership was affordable because membership fees are based on an organization’s annual corporate revenues.

Today, Payara Services is actively engaged as a Strategic member of the Jakarta EE Working Group alongside much larger companies such as Oracle, IBM, Fujitsu, and Red Hat. According to company founder Steve Millidge, the Eclipse Foundation membership easily pays for itself and has a direct impact on the company’s success.

To learn more, read the case study.


Share Your Success Story

We invite all Eclipse Foundation members to participate in our member case study initiative and share their experiences with well-governed, vendor-neutral open source collaboration at the Eclipse Foundation.

To get involved, email

For more insight into why the Eclipse Foundation is the home of entrepreneurial open source, click here.


Share or Adapt Our Case Study Content With Attribution

In the spirit of open source, we’re publishing all of our member case studies under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. As long as you provide attribution according to the terms of the license, you can:

  • Copy and redistribute the case study content in any medium or format.
  • Adapt, transform, and build on the material for any purpose.


Watch for More Member Case Studies

Over the coming months, we’ll bring you member stories from Cedalo, Obeo, and itemis. Keep an eye on my blog for updates on member case studies.

by Thabang Mashologu at November 17, 2020 03:40 PM

OSGi Alliance to Transition to Eclipse Foundation

by Alex Blewitt at November 16, 2020 02:00 PM

The OSGi Alliance announced that after 21 years of being an independent foundation, they would be transferring their assets into the Eclipse Foundation, and continuing work under the OSGi Working Group. InfoQ reached out to Dan Bandera, president of the OSGi Alliance, to find out more about the move.

By Alex Blewitt

by Alex Blewitt at November 16, 2020 02:00 PM

Playing in the Sand

by Donald Raab at November 16, 2020 12:33 AM

A poem about the little things in life.

Rolling sand dunes of Long Beach Island, NJ


I wrote a poem titled “Playing in the Sand” when I was in high school. It was published in my high school literary magazine in 1988. This poem has remained one of my favorites over the years. I think of it every time I go to the beach. I thought the poem might have been lost to time, but my wife found my high school literary magazines today while organizing the closet in our office. I’m posting it today so that I might not lose it again. I hope you enjoy the poem, and think about the the little things in life that are so important.

Playing in the Sand

Can one ever know the beauty of a simple grain of sand?
Tossed about in carelessness and sifted by someone’s hand.
They’re washed up on our beaches and sent back with the tide;
The looking glass of society reflecting the thoughts we hide.
Always felt but never seen like something left behind;
For the individual nobody cares, still the grains don’t seem to mind.
They’re the crystals of the beaches yet treated like so much dirt;
We just shake them off our towels and brush them off our shirts.
The kings of our children’s boxes but to us so many pawns;
We should ask ourselves this question, Would we miss them were they gone?

-Donald Raab

Reflections upon the Sands of Time

Thirty two years have passed since I wrote this poem. To this day, it still evokes positive emotions in me when I go to the beach. I feel at peace and recall all of the fun times I had as a child when I walk in the sand. My kids are now teenagers and I recall all of the fun times we had visiting the Jersey Shore each year. My kids would bury me up to my neck in the sand when they were younger. I always feel relaxed and at peace when I am one with the grains of sand.

Long Beach Island, NJ

by Donald Raab at November 16, 2020 12:33 AM

Weak acknowledgments to decouple signal publishers and subscribers

November 16, 2020 12:00 AM


Ditto 1.2.0 introduced at-least-once delivery via acknowledgement requests.
It increased coupling between the publisher and the subscriber of signals in that the subscriber is no longer at the liberty to filter for signals it is interested in. Instead, the subscriber must consume all signals in order to fulfill acknowledgement requests and prevent endless redelivery.

To combat the problem, Ditto 1.4.0 made acknowledgement labels unique and introduced the requirement to manage declared acknowledgements, identifying of each subscriber.
It is now possible for Ditto to issue weak acknowledgements on behalf of the subscriber whenever it decides to not consume a signal. That allows subscribers to configure RQL and namespace filters freely without causing any futile redelivery.

Note: Weak acknowledgements are available since Ditto 1.5.0.

What it is

A weak acknowledgement is issued by Ditto for any acknowledgement request that will not be fulfilled now or ever without configuration change.
A weak acknowledgement is identified by the header ditto-weak-ack: true.

The status code of weak acknowledgements is 200 OK; it signifies that any redelivery is not to be made on their account.

A weak acknowledgement may look like this in Ditto protocol:

  "topic": "com.acme/xdk_53/things/twin/acks/my-mqtt-connection:my-mqtt-topic",
  "headers": {
    "ditto-weak-ack": true
  "path": "/",
  "value": "Acknowledgement was issued automatically, because the subscriber is not authorized to receive the signal.",
  "status": 200

How it works

Since Ditto 1.4.0, subscribers of twin events or live signals are required to declare unique acknowledgement labels they are allowed to send. The labels of acknowledgement requests are then identifying the intended subscribers.
If the intended subscriber exists but does not receive the signal for non-transient reasons, Ditto issues a weak acknowledgement for that subscriber.
Such reasons may be:

  • The intended subscriber is not authorized to receive the signal by policy;
  • The intended subscriber did not subscribe for the signal type (twin event, live command, live event or live message);
  • The intended subscriber filtered the signal out by its namespace or RQL filter;
  • The intended subscriber dropped the signal because its payload mapper produced nothing.


The distributed nature of cluster pub/sub means that weak acknowledgements are not always issued correctly.
They are only eventually correct in the sense that some time after a change to the publisher-subscriber pair, the issued weak acknowledgements will reflect the change.
Such changes include:

  • Opening and closing of Websocket or other connections acting as the subscriber;
  • Subscribing and unsubscribing for different signal types via Websocket;
  • Modification of connections via the connectivity API;
  • Migration of a connection from one Ditto cluster member to another due to load balancing.


Please get in touch if you have feedback or questions towards this new concept of weak acknowledgements.


The Eclipse Ditto team

November 16, 2020 12:00 AM

Desired Feature Properties

November 11, 2020 12:00 AM

Desired feature properties added to things model

With the upcoming release of Eclipse Ditto version 1.5.0 desired feature properties are introduced to the things model for API versions later than 1. The desired properties for features are added on the same level of the model as the feature properties and can reflect for example feature property updates ,which are intended, but not yet applied.

Note: Further logics for desired feature properties might be implemented in future Ditto versions.

A fully-fledged JSON representation of a feature with desired properties is shown below:

    "lamp": {
        "definition": [ "com.mycompany.fb:Lamp:1.0.0" ],
        "properties": {
            "configuration": {
                "on": true,
                "location": {
                    "longitude": 34.052235,
                    "latitude": -118.243683
            "status": {
                "on": false,
                "color": {
                    "red": 128,
                    "green": 255,
                    "blue": 0
        "desiredProperties": {
            "configuration": {
                "on": false

Operations on desired feature properties

  • CRUD operations
    • You can create multiple desired properties of a feature or just single ones.
    • You can retrieve all desired properties of a feature or just single ones.
    • You can modify all desired properties of a feature or just single ones.
    • You can delete all desired properties of a feature or just single ones.
  • Search
    • You can search for things with specific desired properties with RQL-functions.
    • You can search for things, which have existent desired properties for a feature.
  • Get notified on changes
    • You can receive events for changes done to the desired properties of things you’re authorized to read.
    • You can enrich and filter the events you want to receive, for changes done to the desired properties.

Executing CRUD operations on desired feature properties

CRUD operations can be executed either via the Ditto HTTP API versions later than 1 or via ditto-protocol messages.

Possible CRUD operations for desired feature properties via ditto-protocol:

Using the ditto-client to manage desired feature properties

The desired feature properties can also be retrieved, modified and deleted via the Ditto Java Client. With the upcoming (Ditto Java Client version 1.5.0), no special CRUD operations for desired feature properties are implemented in the client. Thus, the operations have to be executed via creating ditto-protocol messages manually in the client.

Example for creating/modifying desired feature properties of a thing via the ditto-client:

final Adaptable modifyFeatureDesiredProperties =
                                .withValue(JsonObject.newBuilder().set("on", false).build())

        client.sendDittoProtocol(modifyFeatureDesiredProperties).whenComplete(((adaptable, throwable) -> {
            if (throwable != null) {
                LOGGER.error("Received error while sending ModifyFeatureDesiredProperties: '{}' ",
            } else {
      "Received response for ModifyFeatureDesiredProperties: '{}'", adaptable);


Please get in touch if you have feedback or questions towards this new concept of desired properties.


The Eclipse Ditto team

November 11, 2020 12:00 AM

Open VSX Registry is Under New Management!

by Brian King at November 10, 2020 09:05 PM

An Important Announcement to Publishers and Users

What is Open VSX?

The Open VSX Registry offers a community driven, fully open platform for publishing VS Code extensions. The Registry is built on Eclipse Open VSX, which is an open source project hosted at the Eclipse Foundation.

Open VSX is integrated into multiple software applications that support VS Code extensions. There is strong demand for a fully open alternative to the Visual Studio Marketplace, and with hundreds of great extensions already available, it is the intent of the Eclipse Foundation to enable continued and accelerated growth. 

What is Happening?

The Open VSX Registry is being transitioned to the Eclipse Foundation and as of December 9, 2020 will be managed under the Eclipse Cloud Development (ECD) Tools working group. Once the website transition is completed, Eclipse will be responsible for the hosting and maintenance of the site. This post explains what will happen during the transition phase and the implications for you as a publisher or user.


All stakeholders will benefit from  the Open VSX Registry being run by Eclipse. Advantages include:

  • Vendor-neutral, open source operation and governance under the Eclipse Cloud Dev Tools Working Group

  • More marketing and promotion, with the intent of driving more extensions, more visibility, and more consumers to this open, vendor-neutral service. 

  • A publisher agreement designed to add a level of trust, building off the Eclipse Foundation’s reputation for intellectual property management, thus making published extensions more attractive to a broader group of downstream consumers, notably corporate consumers. 

What you Need to Know if you are a Consumer of Open VSX Extensions

If you are consuming extensions in applications that use the Open VSX Registry ( i.e. in Gitpod or VSCodium) there will be no usage impact. You can expect  a seamless experience, while we work to add more extensions, raise the visibility and increase the number of consumers, to ensure the long-term viability and vibrancy of the registry.

What you Need to Know if you are a Publisher to Open VSX

Our goal is to minimize disruption through this transition. If you are an existing publisher to the Open VSX Registry, there are two items that will require your attention:

  • You will be required to accept the Eclipse Publisher Agreement

  • You will need to ensure that your extensions are published under a license

Publisher Agreement

The current publishing process is described in the openvsx Wiki. From December 2020 onwards, in order to publish an extension or to keep your current extensions published, you will need to take the following steps:

  • Login and authorize with your GitHub account. Even if you have already authorized, you will need to do it again. A GitHub account is still required as the initial authentication layer.

  • Set up or use an existing Eclipse account. You will be able to set that up or connect an existing account on the Settings page of 

  • Confirm your consent to the Publisher Agreement


Open VSX currently allows the publication of all extensions, including those which do not specify their license terms. Going forward, unlicensed extensions will not be allowed. If publishing an unlicensed extension, you will have the opportunity to choose the MIT license as a default. You are also free to choose any other license by putting its identifier into the extension manifest (package.json file). The opportunity to choose MIT will be given by the command line tool. If you have questions about what license is best for you, we recommend that you read about licenses at the Open Source Initiative.


Above all, Open VSX is a community. We thrive on collaboration and, with this change, will continue to build more opportunities to contribute.

Here are some ways to get involved right now:


For Publishers, these are the important dates to be aware of:

November 10, 2020: Starting from the publish date of this post, you should prepare for the upcoming changes. If your extension is unlicensed, choose one that is right for you and add it to your extension. Otherwise you will have the opportunity later to opt-in to the MIT license.

December 9, 2020:  Changes to the site will be effective as of this date. From that day on, if you already have an extension listed, you will have a 30 day grace period to accept the publisher agreement and add a license. Note that adding a license will require that you create a new version.

January 8, 2021: If you have not taken both steps by this date, your extension will be deactivated until you do take necessary action. Before this date and potentially after, we will be reaching out to publishers via their code repositories to remind them of the changes needed.

The Open VSX Registry is not a success without you and the great extensions that you write. Thank you for considering and supporting these changes, which are designed to cause as little disruption as possible. Please join us in offering a first class open and vendor-neutral extension registry.

by Brian King at November 10, 2020 09:05 PM

Eclipse RCP and REST – Improved ECF support for properties and profiles

by Patrick at November 05, 2020 05:33 PM

This is a continuation of a series of blog posts demonstrating the use of the ECF Remote Services JAX-RS Jersey Client within an Eclipse RCP application. The previous posts are:

The REST calls made by the Eclipse RCP SpaceX client are done using the ECF Remote Services framework. To make it easier to configure these services, two new additional features have been added in ECF 3.14.18 released this week.

Support for properties files alongside the EDEF XML

Up to this point ECF Remote Services endpoints have been configured with an EDEF file, which is an XML file containing the endpoint definition. While that still works well, it’s now possible to create a properties file alongside the EDEF file. The properties file must be in the same directory and have the same base filename as the EDEF file.

So in our SpaceX client we have an XML file called LaunchService_EDEF.xml.

<endpoint-descriptions xmlns="">
		<property name="" value-type="String" value="" />
		<property name="objectClass" value-type="String">
		<!--  More properties here -->

Using the new ECF support for local properties we can create a file (in the same directory) called Properties specified in this file will override any set in the XML file.

# This URL will be used to locate the endpoint

Support for multiple configurations using profiles

Endpoint definitions often need to vary based on some runtime configuration. For example, you may have a different endpoint URL for various environments.

ECF Remote Services endpoints now support this type of configuration using a profile name and matching properties files. The profile name itself is specified as a command line argument:

The framework will attempt to locate a properties file (again, in the same directory as the EDEF XML file) that has the profile name attached to the base file name: basename-{profile}.properties.

Given this argument set to dev, the framework will be looking for a matching properties file named

Wrapping up

These additional features make it easier to create and manage REST clients using the ECF Remote Services framework. If you’re buried in low-level Java REST client code, the ECF Remote Services JAX-RS Jersey Client can offer a much simpler and cleaner approach.

Note that if you’ve been using earlier versions of ECF Remote Services, you’ll need to reload the SpaceX Client target to bring in the latest version (3.14.18 or later).

The latest SpaceX client code can be found here:

by Patrick at November 05, 2020 05:33 PM

Eclipse Vert.x 4 CR1 released!

by vietj at November 04, 2020 12:00 AM

We are extremely pleased to announce the first release candidate of Vert.x 4.0 .

We consider Vert.x 4.0 as feature complete and we will do a few release candidates to allow the community to test it and report issues.

Vert.x 4 is the evolution of the Vert.x 3.x series that will bring key features to Vert.x.

Tracing control

When a component (i.e server or client) is involved in a Vert.x instance configured with tracing, a new tracing policy controls the component participation in a trace:

  • with IGNORE the component will not be involved in the trace, e.g an HTTP client will not report a span in an existing trace
  • with PROPAGATE the component will report a span and propagate when possible
  • ALWAYS the component will report a span or create a new trace

Kafka tracing

Our Kafka client is now able to propagate and report span in active traces.


A new method has been added to RoutingContext to allow sending responses from asynchronous calls using Vert.x futures.

For example, returning the content of a file in a single action:

  .respond(ctx ->

This method allows composition of Futures. The Future result will be processed by the JSON codec if no data has been written, otherwise it will use the future success/failure to decide how to terminate the connection.

This method should improve the code readablility of current and future applications.

Web client auth

With this release you will be able to use Basic, Digest and Bearer authentication in a single and concise API: client.authentication(new Credentials(...)). This is a type safe alternative to compute the headers yourself.

Redis client

Redis clients are now garanteed to call all handlers on the correct event loop. This reduces context switches and remove possible races.

RabbitMQ client TLS support

RabbitMQ client can now connect using TLS.

SockJS JavaScript client versionning change

SockJS event bus JavaScript client is now versionned according to the EventBus bridge protocol and is now independant on the Vert.x version.

That has always been the case and with Vert.x 4 we decided to make this change to simplify application upgrade since upgrading Vert.x will not imply to upgrade event bus bridge clients.

In order to ensure that the artifact can be used both with Vert.x 3 and Vert.x 4, a new name has been choosen for it: @vertx/eventbus-bridge-client.js


This is the first relase candidate of Vert.x 4, you can of course expect more as we get feedback from the community and fix issues that we failed to catch before.

You can also read the previous announces to know more about the overral changes:

The deprecations and breaking changes can be found on the wiki.

For this release there are no Docker images.

The release artifacts have been deployed to Maven Central and you can get the distribution on Maven Central.

You can bootstrap a Vert.x 4.0.0.CR1 project using

The documentation has been deployed on this preview web-site

That’s it! Happy coding and see you soon on our user or dev channels.

by vietj at November 04, 2020 12:00 AM

What’s new in Fabric8 Kubernetes Java client 4.12.0

by Rohan Kumar at October 30, 2020 07:00 AM

The recent Fabric8 Kubernetes Java client 4.12.0 release includes many new features and bug fixes. This article introduces the major features we’ve added between the 4.11.0 and 4.12.0 releases.

I will show you how to get started with the new VolumeSnapshot extension, CertificateSigningRequests, and Tekton triggers in the Fabric8 Tekton client (to name just a few). I’ll also point out several minor changes that break backward compatibility with older releases. Knowing about these changes will help you avoid problems when you upgrade to the latest version of Fabric8’s Java client for Kubernetes or Red Hat OpenShift.

How to get the new Fabric8 Java client

You will find the most current Fabric8 Java client release on Maven Central. To start using the new Java client, add it as a dependency in your Maven pom.xml. For Kubernetes, the dependency is:


For OpenShift, it’s:


Breaking changes in this release

We have moved several classes for this release, so upgrading to the new version of the Fabric8 Kubernetes Java client might not be completely smooth. The changes are as follows:

  • We moved the CustomResourceDefinition to io.fabric8.kubernetes.api.model.apiextensions.v1 and io.fabric8.kubernetes.api.model.apiextensions.v1beta1.
  • We moved SubjectAccessReview, SelfSubjectAccessReview, LocalSubjectAccessReview, and SelfSubjectRulesReview to io.fabric8.kubernetes.api.model.authorization.v1 and io.fabric8.kubernetes.api.model.authorization.v1beta1.
  • The io.fabric8.tekton.pipeline.v1beta1.WorkspacePipelineDeclaration is now io.fabric8.tekton.pipeline.v1beta1.PipelineWorkspaceDeclaration.
  • We introduced a new interface, WatchAndWaitable, which is used by WatchListDeletable and other interfaces. This change should not affect you if you are using the Fabric8 Kubernetes Java client’s domain-specific language (DSL).

The new VolumeSnapshot extension

You might know about the Fabric8 Kubernetes Java client extensions for Knative, Tekton, Istio, and Service Catalog. In this release, we’ve added a new Container Storage Interface (CSI) VolumeSnapshot extension. VolumeSnapshots are in the directory. To start using the new extension, add the following dependency to your Maven pom.xml:


Once you’ve added the dependency, you can start using the VolumeSnapshotClient. Here’s an example of how to create a VolumeSnapshot:

try (VolumeSnapshotClient client = new DefaultVolumeSnapshotClient()) {
      System.out.println("Creating a volume snapshot");

Spin up a single pod with

Just like you would with kubectl run, you can quickly spin up a pod with the Fabric8 Kubernetes Java client. You only need to provide a name and image:

try (KubernetesClient client = new DefaultKubernetesClient()) {"default").withName("hello-openshift")

Authentication API support

A new authentication API lets you use the Fabric8 Kubernetes Java client to query a Kubernetes cluster. You should be able to use the API for all operations equivalent to kubectl auth can-i. Here’s an example:

try (KubernetesClient client = new DefaultKubernetesClient()) {
    SelfSubjectAccessReview ssar = new SelfSubjectAccessReviewBuilder()

    ssar = client.authorization().v1().selfSubjectAccessReview().create(ssar);

    System.out.println("Allowed: "+  ssar.getStatus().getAllowed());

OpenShift 4 resources

The Fabric8 Kubernetes Java client now supports all of the new OpenShift 4 resources in its OpenShift model. Additional resources added in,,, and are also available within the OpenShift model. Here is an example of using PrometheusRule to monitor a Prometheus instance:

try (OpenShiftClient client = new DefaultOpenShiftClient()) {
    PrometheusRule prometheusRule = new PrometheusRuleBuilder()


    PrometheusRuleList prometheusRuleList = client.monitoring().prometheusRules().inNamespace("rokumar").list();
    System.out.println(prometheusRuleList.getItems().size() + " items found");

Certificate signing requests

We’ve added a new entry point, certificateSigningRequests(), in the main KubernetesClient interface. This means you can use CertificateSigningRequest resources in all of your applications developed with Fabric8:

try (KubernetesClient client = new DefaultKubernetesClient()) {

    CertificateSigningRequest csr = new CertificateSigningRequestBuilder()
            .addNewUsage("client auth")

Custom resource definitions

We’ve moved the apiextensions/v1 CustomResourceDefinition (CRD) to the io.fabric8.kubernetes.api.model.apiextensions.v1beta1 and io.fabric8.kubernetes.api.model.apiextensions.v1 packages. You can now use CustomResourceDefinition objects inside apiextensions() like this:

try (KubernetesClient client = new DefaultKubernetesClient()) {
            .getItems().forEach(crd -> System.out.println(crd.getMetadata().getName()));

Creating bootstrap project templates

We’ve provided a new, built-in way to create a project with all of the role bindings you need. It works like OpenShift’s oc adm create-bootstrap-project-template command. Specify the parameters that the template requires in the DSL method. The method then creates the Project and related RoleBindings for you:

try (OpenShiftClient client = new DefaultOpenShiftClient()) {
    client.projects().createProjectAndRoleBindings("default", "Rohan Kumar", "default", "developer", "developer");

Tekton model 0.15.1

We’ve updated the Tekton model to version 0.15.1 so that you can take advantage of all the newest upstream features and enhancements for Tekton. This example creates a simple Task and TaskRun to echo “hello world” in a pod. Instead of YAML, we use the Fabric8 TektonClient:

try (TektonClient tkn = new DefaultTektonClient()) {
    // Create Task
            .withArgs("Hello World")

    // Create TaskRun

When you run this code, you will see the Task and TaskRun being created. The TaskRun, in turn, creates a pod, which prints the “Hello World” message:

tekton-java-client-demo : $ tkn taskrun list
NAME                        STARTED         DURATION     STATUS
echo-hello-world-task-run   2 minutes ago   19 seconds   Succeeded
tekton-java-client-demo : $ kubectl get pods
NAME                                  READY   STATUS      RESTARTS   AGE
echo-hello-world-task-run-pod-4gczw   0/1     Completed   0          2m17s
tekton-java-client-demo : $ kubectl logs pod/echo-hello-world-task-run-pod-4gczw
Hello World

Tekton triggers in the Fabric8 Tekton client

The Fabric8 Tekton client and model now support Tekton triggers. You can use triggers to automate the creation of Tekton pipelines. All you have to do is embed your triggers in the Tekton continuous deployment (CD) pipeline. Here is an example of using the Fabric8 Tekton client to create a Tekton trigger template:

try (TektonClient tkn = new DefaultTektonClient()) {
                    .withDescription("The git repository url")
                    .withDescription("The git revision")
                    .withDescription("The message to print")
                    .withDefault("This is default message")
                    .withDescription(" The Content-Type of the event")
            .withResourcetemplates(Collections.singletonList(new PipelineRunBuilder()
                            .withValue(new ArrayOrString("$(tt.params.message)"))
                            .withValue(new ArrayOrString("$(tt.params.contenttype)"))

Automatically refresh OpenID Connect tokens

If your Kubernetes provider uses OpenID Connect tokens (like IBM Cloud), you don’t need to worry about your tokens expiring. The new Fabric8 Kubernetes Java client automatically refreshes your tokens by contacting the OpenID Connect provider, which is listed in the ~/.kube/config.

Support for Knative 0.17.2 and Knative Eventing Contrib

For this release, we’ve updated the Knative model to the latest version. We also added new support for the additional resources from Knative Eventing Contrib, which involves sources and channel implementations that integrate with Apache CouchDB, Apache Kafka, Amazon Simple Queue Service (AWS SQS), GitHub, GitLab, and so on.

Here’s an example of creating an AwsSqsSource using KnativeClient:

try (KnativeClient client = new DefaultKnativeClient()) {
    AwsSqsSource awsSqsSource = new AwsSqsSourceBuilder()
            .withNewAwsCredsSecret("credentials", "aws-credentials", true)
            .withSink(new ObjectReferenceBuilder()

Get involved!

There are a few ways to get involved with the development of the Fabric8 Kubernetes Java client:


The post What’s new in Fabric8 Kubernetes Java client 4.12.0 appeared first on Red Hat Developer.

by Rohan Kumar at October 30, 2020 07:00 AM

Jakarta EE Community Update October 2020

by Tanja Obradovic at October 28, 2020 01:55 PM

This month’s Jakarta EE round-up includes news about the latest Jakarta EE 9-compatible product, Jakarta EE 9 specification status, JakartaOne Livestream and Jakarta EE Virtual Tour 2020 (and 2021!) dates, community calls, and more. Keep reading to get all the details.


Another Jakarta EE 8 Compatible Product

Great news! The FUJITSU Software Enterprise Application Platform has achieved full platform compatibility with Jakarta EE 8. That is the 9th Jakarta EE 8 compatible product!!

For the complete list of Jakarta EE 8 platform and web profile compatible products, click here.


Encourage Developer Tool and Platform Providers to Migrate to the New Namespace

If you have a preferred developer tool vendor or a platform provider please consider asking them to migrate to the new Jakarta namespace so you can continue to use them with Jakarta EE 9 and beyond. Also, this is a great time to start planning migration of your enterprise applications to the new Jakarta namespace!

 To help vendors make the transition, the Jakarta EE community has developed a data sheet summarizing the namespace migration challenge and opportunity. You can download the data sheet here.


All but Five of the Jakarta EE 9 Specifications are in ballot!

As we get closer to the November 20 General Availability release date for Jakarta EE 9, here’s a summary of the latest status on specification approvals. Following the Jakarta EE Specification Process (JESP), we now have more than half of the specifications approved as Ratified Final Specification, 8 specifications are being voted on and we are about to start the ballot for 4 specifications. The only one still in waiting is the final Jakarta EE Specification, expected to be on the ballot at the end of next week! We are right on track for November 20th release.

Completed: 57 percent (or 20 specification)

Jakarta Concurrency
Jakarta Persistence
Jakarta Web Services Metadata
Jakarta Activation
Jakarta Bean Validation
Jakarta Dependency Injection
Jakarta Expression Language
Jakarta JSON Processing
Jakarta Servlet
Jakarta SOAP with Attachments
Jakarta Authentication
Jakarta Authorization
Jakarta Debugging Support for Other Language
Jakarta JSON Binding
Jakarta Mail
Jakarta Contexts and Dependency Injection (CDI)
Jakarta XML Web Services Specification
Jakarta Batch
Jakarta Security
Jakarta Server Faces


In the ballot process: 26 percent or 8 specifications

Jakarta Messaging
Jakarta WebSocket
Jakarta Server Pages
Jakarta XML Binding
Jakarta RESTful Web Services
Jakarta Transactions
Jakarta Connectors
Jakarta Standard Tag Library

About to start the ballot process: 14 percent or 4 specifications

Jakarta Interceptors
Jakarta Enterprise Beans
Jakarta Enterprise Web Services
Jakarta EE Web Profile

Updates in progress: 3 percent or 1 specification

Jakarta EE Platform

The chart below provides a visual summary of our progress.



Register for JakartaOne Livestream Today

Be sure to reserve Tuesday, December 8, to attend JakartaOne Livestream. This year’s virtual event will include demos and interviews as well as a keynote address by Eclipse Foundation Executive Director, Mike Milinkovich.

The program committee is now reviewing the submitted papers — thanks to everyone who submitted — and you can expect to see the event details and program schedule in early November.

Register today to reserve your spot. JakartaOne Livestream is a great way to learn more about the technical benefits and architectural advances that become possible with cloud native Java, Jakarta EE, Eclipse MicroProfile, and Java EE technologies.

For live event updates, speaker announcements, news, and more, follow @JakartaOneConf on Twitter.


JakartaOne Livestream - Spanish: Watch the Replay

The JakartaOne Livestream Spanish event on October 12 was a huge success with 513 registered individuals so far. More than 300 people attended the live event and almost 200 more have watched the replay.

The event included a keynote address, vendor talks about compatible implementations by Red Hat, Tomitribe, Payara, and Oracle, and five technical talks.

To see the session topics, click here.

To watch the session replays, click here. Note that the sessions are delivered in Spanish.


Book Your Jakarta EE Virtual Tour

Jakarta EE Developer Advocate, Ivar Grimstad, and I (Tanja Obradovic) have started our Jakarta EE Virtual Tour, providing one-hour talks on Jakarta EE 9 and beyond to Java communities.

The current schedule for the Jakarta EE Virtual Tour is shown below, but there are still openings, and the tour will continue in 2021, so don’t hesitate to contact me ( if you’d like us to present at your Java User Group (JUG) or Meetup event.

Upcoming Events

Eclipse Foundation staff and community members will be participating in a number of upcoming events related to Java and Jakarta EE. Here are brief summaries to help you choose the ones you want to attend.

Java Community Online Conference (JCON) 2020

·  Speaker: Gaël Blondelle, Managing Director, Eclipse Foundation Europe GmbH, and Vice President, Ecosystem Development at the Eclipse Foundation

·  Topic: Cloud Native Java at the Eclipse Foundation - Not your parents' Eclipse!

·  Date: Thursday October 29, 2020, 15:00-16:00 CET

Cloud Native Development Panel Discussion Meetup

·  Speakers: Niklas Heidloff from IBM and Rudy De Busscher from Payara with me (Tanja Obradovic) as moderator

·  Topic: All things cloud native

·  Date: Tuesday October 27, 2020, 17:00-18:00 GMT+1

KubeCon + CloudNativeCon North America

·  Speakers: The Eclipse Foundation will host a virtual community booth with cloud native Java experts on hand and community members who will participate in the booth chat session so be sure to visit us, meet community experts, and ask questions.

·  Topics: Live talks, demos, and Q&A sessions

·  Dates: November 17-20


Jakarta EE Community Calls

The Jakarta EE community hosted two calls in October. If you weren’t able to join the calls live, we’ve provided very brief summaries and links to the recordings below.

Jakarta EE Working Group Members’ Call

On October 6, the Jakarta EE Steering Committee hosted a call with Jakarta EE Working Group members to discuss the following topics:

·  Welcome Jakarta EE members: Will Lyons and David Blevins

·  Introduction of Jakarta EE Working Group committees: Will Lyons (Steering), Paul Buck (Specification), Neil Patterson (Marketing)

·  Jakarta EE to date: Will Lyons, Tanja Obradovic

·  Jakarta EE 9: Kevin Sutter

·  Opportunities and benefits for members: Tanja Obradovic

·  Jakarta EE Working Group experiences and how we can do better: Eric Meng, Ruslan Synytsky, Rob Tompkins, and others

Access the recording here.

Public Steering Committee Call

On October 13, Jakarta EE Steering Committee members provided the following updates during the J4K conference:

·  Jakarta EE 9: Kevin Sutter

·  JakartaOne Livestream 2020: Tanja Obradovic

·  Jakarta EE 10: Ivar Grimstad

Access the recording here.

Join Our Upcoming Calls

Jakarta EE community calls are open to everyone! For upcoming dates and connection details, see the Jakarta EE Community Calendar.

We know it’s not always possible to join calls in real time, so here are links to the recordings and presentations:

·  October call presentations

·  The complete playlist


Stay Connected With the Jakarta EE Community

The Jakarta EE community is very active and there are a number of channels to help you stay up to date with all of the latest and greatest news and information. Subscribe to your preferred channels today:

·  Social media: Twitter, Facebook, LinkedIn Group

·  Mailing lists:,, project mailing lists

·  Newsletters, blogs, and emails: Eclipse newsletter, Jakarta EE blogs

·  Meetings: Jakarta Tech Talks, Jakarta EE Update, Jakarta Town Hall, and Eclipse Foundation events and conferences

You can find the complete list of channels here.

To help shape the future of open source, cloud native Java, get involved in the Jakarta EE Working Group.

To learn more about Jakarta EE-related plans and check the date for the next Jakarta Tech Talk, be sure to bookmark the Jakarta EE Community Calendar.


by Tanja Obradovic at October 28, 2020 01:55 PM

2020 Trends in IoT, Edge, and AI Development

by Mike Milinkovich at October 19, 2020 01:08 PM

The results of our 2020 IoT Developer Survey are in, revealing a number of interesting trends that will impact all IoT ecosystem players. Whether you’re a technology manufacturer, a service provider, an enterprise adopter of IoT solutions, or an individual developer, this year’s survey results provide insight that will help you better understand how developers’ choices are impacting IoT strategies and businesses.

This year, more than 1,650 individuals from a broad range of industries and organizations around the globe responded to the IoT Developer Survey and I want to thank them for their time. Their valuable input will help ensure the Eclipse IoT Working Group and the Eclipse Edge Native Working Group continue to focus on developers’ top priorities for cloud-to-edge IoT solution development.

Here are just a few of the highlights.

Smart Agriculture Is the New Industry Focus Area

One of the most significant findings in this year’s survey is that smart agriculture is now the top IoT industry focus area, jumping from 21 percent in our 2019 IoT Developer Survey to 26 percent this year.

IoT-based solutions are increasingly being used to boost yields, lower costs, reduce waste, and achieve other efficiencies on farm and dairy enterprises, as well as within food processing plants. Optimizing food production is vital to every country in the world, and a quick internet search on the topic confirms our survey results reflect the overall growth in the global agriculture IoT market.

Interestingly, last year’s top industry focus, home automation, dropped significantly in this year’s survey. At 19 percent, this category fell behind industrial automation, education, automotive, and smart cities, which tied for second place at 21 percent.

Artificial Intelligence Is the Top Choice for Edge Computing Workloads

IoT and edge computing are intrinsically linked, so it was natural to include questions related to edge computing technologies in this year’s IoT Developer Survey.

Notably, the results show that developers are now more focused on artificial intelligence (AI). AI was the most frequently selected edge computing workload at 30 percent. However, other applications follow closely behind:

  • Control logic: 29 percent
  • Data exchange: 27 percent
  • Data aggregation and filtering (sensor fusion): 27 percent

The relatively even rankings among these four options confirm they’re all being actively used for edge computing workloads. It will be interesting to see how their usage evolves over time and how quickly AI adoption progresses.

IoT Is Synonymous With Open Source

The survey results also reveal that 65 percent of respondents experiment with, use, or contribute to open source projects. In the database domain, open source almost completely dominates with only four percent of survey respondents relying on a proprietary database. These are very strong endorsements of the value developers see in open source software for IoT solutions.

At the Eclipse Foundation, we’re experiencing first-hand the momentum toward open source software in IoT.

Over the last few years, the Eclipse Foundation IoT community has grown to become one of the largest open source collaborations in the world with 45 projects, 350+ contributors, 40+ corporate members, and more than eight million lines of code produced. Eclipse IoT projects have been adopted by some of the world’s leading companies, including Bosch, Red Hat, Eurotech, and many others, to deliver commercial IoT solutions and services. 

Get the Complete Survey Results

The findings I’ve highlighted here provide just a small glimpse into this year’s IoT Developer Survey results. I encourage everyone to download the full 2020 IoT Developer Survey results to gain additional insight into:

  • The top IoT developer concerns
  • The most widely used security techniques in IoT and the growing momentum of distributed ledger technologies
  • The most widely used programming languages for IoT solutions
  • The top edge computing artifacts and deployment choices
  • The top IoT middleware choices
  • The top public IoT and cloud platforms

Download the 2020 IoT Developer Survey results.

Get Involved in Eclipse IoT Communities

To stay current with the happenings in the Eclipse IoT Working Group, join the mailing list here.

To join the Eclipse Edge Native Working Group conversation on Slack, click here.

by Mike Milinkovich at October 19, 2020 01:08 PM

T-4:00 OCP is ready to go

October 17, 2020 10:00 AM

Atop the Sirius-II Mission’s rocket is the Obeo Cloud Platform (OCP), with two flavors – OCP Modeler and OCP Publication – safely strapped inside. The Obeo Cloud Platform is built as an open-core product relying on the open source Eclipse Sirius project (EPL 2.0 licence) and more precisely on the Sirius Web component. As I explained in my previous post, Sirius Web is a framework from Obeo for building cloud graphical modelers for a dedicated DSL.

OCP Publication

OCP Publication exposes models in a read-only mode for fast access from OSLC clients or web browsers. The first version of this product is ready to be deployed to our customers at the end of October.

One of the first use cases we developed allows us to reunite two of our chosen fields: Capella and model servers, it is Publication For Capella. Publication for Capella provides a tight integration between OSLC-compliant ALM tools (Polarion, Doors Next…) and the MBSE workbench Capella. It enables a fine grained traceability between your requirements and your system design.

OCP Modeler

OCP Modeler is a unique technology to easily develop custom and state-of-the-art modeling tools to be deployed to the Cloud. The Obeo Cloud Platform Modeler is a Sirius Web build extended with Enterprise features, to deploy on public, private clouds or on premise and including support and upgrade guarantees. The Obeo Cloud Platform provides collaborative features: authentication, live collaboration, webhooks…

To get more details, attend the OCP Modeler’s launch on October 21 at 2:00 p.m CET.

October 17, 2020 10:00 AM

Eclipse Che vs. VS Code (online|codespaces)

by Jonas Helming and Maximilian Koegel at October 14, 2020 12:39 PM

Have you heard about Eclipse Che and wonder how it compares to VS Code Online or “VS Code Codespaces”? What are...

The post Eclipse Che vs. VS Code (online|codespaces) appeared first on EclipseSource.

by Jonas Helming and Maximilian Koegel at October 14, 2020 12:39 PM

T-8:00 1st stage Sirius Web loading begins

October 13, 2020 10:00 AM

Source code is flowing into the first stage of the Obeo rocket. Our goal is to bring the spirit of Sirius into a new technological space : Sirius Web is the Cloud-based evolution of Sirius, 100% Open Source.

The Sirius Web engine combines the open source components EMF-JSON & Sirius Components. These components will be available under the Sirius project :, with the source code on Github :

  • EMF-JSON is a small library to serialize EMF models to JSON,
  • The Sirius Components repository provides backend and frontend components
  • The Sirius Web repository combines the open source Sirius components to provide a graphical modeler sample application.

How do you create a cloud-ready modeler based on Sirius Web?

  1. Define your metamodel thanks to EMF.
  2. Provide a Sirius configuration to specify the mapping between the different concepts of your DSL and how they should be represented graphically.
  3. Register the metamodel & the Sirius specification in the Sirius Web application.
  4. Build and launch the application!

As a result, you get a graphical modeler dedicated to your DSL rendered in your browser.

To get more details about Sirius Web and how to run it for your own DSL, attend Obeo’s rocket liftoff. Launch remains on schedule for October 21 at 2:00 p.m CET.

October 13, 2020 10:00 AM

JBoss Tools and Red Hat CodeReady Studio for Eclipse 2020-09

by jeffmaury at October 13, 2020 09:57 AM

JBoss Tools 4.17.0 and Red Hat CodeReady Studio 12.17 for Eclipse 2020-09 are here waiting for you. Check it out!



Red Hat CodeReady Studio comes with everything pre-bundled in its installer. Simply download it from our Red Hat CodeReady product page and run it like this:

java -jar codereadystudio-<installername>.jar

JBoss Tools or Bring-Your-Own-Eclipse (BYOE) CodeReady Studio require a bit more:

This release requires at least Eclipse 4.17 (2020-09) but we recommend using the latest Eclipse 4.17 2020-06 JEE Bundle since then you get most of the dependencies preinstalled.

Java11 is now required to run Red Hat Developer Studio or JBoss Tools (this is a requirement from Eclipse 4.17). So make sure to select a Java11 JDK in the installer. You can still work with pre-Java11 JDK/JRE and projects in the tool.

Once you have installed Eclipse, you can either find us on the Eclipse Marketplace under "JBoss Tools" or "Red Hat CodeReady Studio".

For JBoss Tools, you can also use our update site directly.

What is new?

Our main focus for this release was an improved tooling for the Quarkus framework, improvements for container based development and bug fixing. Eclipse 2020-09 itself has a lot of new cool stuff but let me highlight just a few updates in both Eclipse 2020-09 and JBoss Tools plugins that I think are worth mentioning.


OpenShift Container Platform 4.6 support

With the new OpenShift Container Platform (OCP) 4.6 now available, JBoss Tools is compatible with this major release in a transparent way. Just define your connection to your OCP 4.6 based cluster as you did before for an OCP 3 cluster, and use the tooling !


Support for YAML configuration file

Quarkus supports configuration through YAML format. For more information, see the Quarkus documentation

In order to use it, follow the steps:

  • create a Quarkus project using the new Quarkus wizard

  • create a new application.yaml or application.yml next to the in src/main/resources

The editor will open and you will get content assist and syntax validation.

Server Tools

Wildfly 21 Server Adapter

A server adapter has been added to work with Wildfly 21. It adds support for Java EE 8, Jakarta EE 8 and Microprofile 3.3.

Hibernate Tools

Hibernate Runtime Provider Updates

A number of additions and updates have been performed on the available Hibernate runtime providers.

Runtime Provider Updates

The Hibernate 5.4 runtime provider now incorporates Hibernate Core version 5.4.21.Final and Hibernate Tools version 5.4.21.Final.

The Hibernate 5.3 runtime provider now incorporates Hibernate Core version 5.3.18.Final and Hibernate Tools version 5.3.18.Final.


Views, Dialogs and Toolbar

Adjustable view fonts

The font used for tree and table views can now be customized with a font preference. This preference is called "Tree and Table font for views" and can be found in Window > Preferences > General > Appearance > Colors and Fonts under the "View and Editor Folders" category.

adjustable view font preference

The Project Explorer is an example of a view that gets affected by this font preference.

adjustable view font
Remove gifs from views

Several years ago, the icons of the platform views were migrated to .png files. As already opened views store their reference to the image, the .gif files were left in the code. These have been removed now. If you are using the same workspace for multiple years and view icons are missing due to that removal, you have to close and reopen the view.

Default changed for confirm on exit for last window

By default, Eclipse now closes if you select the close icon on the last window without additional confirmation dialog. If you want to get a confirmation dialog, you can enable that via Window > Preferences > General > Startup and Shutdown > Confirm exit when closing last window.

Workbench models created in releases before 2014 are not automatically converted

Workbench models (workbench.xmi) stored in workspaces created with releases before 2014 and never opened with a later release are not automatically converted anymore if opened with the 2020-09 release.

Text Editors

Multiple Last Edit Locations

Previous Edit Location navigation (formerly named Last Edit Location) is now expanded to remember multiple edit locations.

The last 15 edit locations are now remembered. For convenience, similar edit locations in close proximity to each other are also merged so that each of the 15 remembered locations remains distinct.

multiple last edit locations

How to use

Two new keyboard shortcuts are introduced:

  • Ctrl+Alt+LEFT_ARROW (or on Mac Ctrl+Opt+LEFT_ARROW) navigates to the most recent edit location, just as Ctrl+Q always has in prior releases.

    However, now continuing to hold Ctrl+Alt and then pressing LEFT_ARROW again begins a traversal through the history of prior edit locations, with each additional press of LEFT_ARROW moving a step further back in history. Once traversal stops, future Ctrl+Alt+LEFT_ARROW actions are now temporarily anchored to this older historical location for easy exploration of that code region.

    The classic Ctrl+Q mapping has been likewise enhanced with this new functionality, so that Ctrl+Q and Ctrl+Alt+LEFT_ARROW are synonymous.

  • Ctrl+Alt+RIGHT_ARROW (or on Mac Ctrl+Opt+RIGHT_ARROW) conversely moves the anchor forward through edit history, so after traversing backward with Ctrl+Alt+LEFT_ARROW, you can go forward again by holding Ctrl+Alt and repeatedly pressing RIGHT_ARROW. A new menu item has likewise been added for this forward navigation as well.

New edit locations are always inserted at the end, so original historical ordering is always maintained. New edits also reset the last location "anchor" back to the most recent edit, so that pressing Ctrl+Alt+LEFT_ARROW once again brings you to the most recent edit rather than a historical one.

Printing editor content adds date in header

Printing editor content now includes the current date in addition to the filename in the header of each printed page.

print header date

Themes and Styling

Improved GTK light theme

The GTK light theme has been updated to align better with the default GTK3 Adwaita theme.


gtk light old


gtk light new
Windows menus are styled in the dark theme

SWT now natively styles the menu under Windows in the dark theme.


menu background old


menu background dark
Dropbox boxes (Combos) are styled under Windows in the dark theme

SWT now natively styles drop-down boxes under Windows in the dark theme.


combo win32 dark old


combo win32 dark new
Selection highlighter for dark theme

The active tab selection highlighter has been enabled for Eclipse’s default dark themes. This will help users identify which tab is active at a glance.

dark selection highlighter
Selection highlighter for tables under Windows in the dark theme

SWT now natively supports selection highlighter in tables under Windows in the dark theme.

selection highlight


Filter null bytes from console output

The interpretation of ASCII control characters in the Console View was extended to recognize the characters: \0 - null byte. If interpretation is enabled, any null byte will be stripped and not shown in console view. This is most relevant for the Linux platform where a null byte in console view causes anything after it on the same line to be not rendered.

This feature is disabled by default. You can enable it on the Run/Debug > Console preference page.

General Updates

Builds for Linux AArch64 (aka Arm64) added

Binaries for Linux AArch64 (Arm64) are available for testing. With the raising popularity of this architecture people can continue using the Eclipse IDE even when changing their machine.

Java Developement Tools (JDT)

Java 15 Support

Java 15

Java 15 is out and Eclipse JDT supports Java 15 for 4.17 via Marketplace.

The release notably includes the following Java 15 features:

  • JEP 378: Text Blocks (Standard).

  • JEP 384: Records (Second Preview).

  • JEP 375: Pattern Matching for Instanceof (Second Preview).

  • JEP 360: Sealed Classes (Preview).

Please note that preview option should be on for preview language features. For an informal introduction of the support, please refer to Java 15 Examples wiki.


Collapse all nodes in JUnit view

JUnit view now provides a context-menu option to collapse all nodes:

junit collapse all
Sort test results by execution time

JUnit view now provides the ability to sort results by execution time. By default, results will be sorted by execution order. Choosing Sort By > Execution Time from the JUnit View menu will reorder the results once all tests are complete. While tests are still running, they will be shown in execution order.

junit sort time before

Sorting by execution order results in:

junit sort time after

Java Editor

Substring/Subword matches for types

Content Assist now fully supports both substring and subword matches for types:

substring types

Substring matches are always shown and subword matches can be enabled/disabled with the existing Show subword matches option on the Java > Editor > Content Assist preference page.

Optimization tab

A new tab has been added that gathers cleanups that improve the time performance: the existing lazy operator cleanup and the regex precompiler cleanup.

regex preferences

A new clean up has been added that makes use of Objects.equals() to implement the equals(Object) method.

It reduces the code and improves the reading. The cleanup is only available for Java 7 or higher. Although this kind of comparison is almost exclusively seen in the equals(Object) method, it can also reduce code in other methods.

To select the clean up, invoke Source > Clean Up…​, use a custom profile, and on the Configure…​ dialog select Use Objects.equals() in the equals method implementation on the Unnecessary Code tab.

objects equals preferences

For the given code:

objects equals before

You get this after the clean up:

objects equals after
Precompiles the regular expressions

A new clean up has been added that optimizes the regular expression execution by precompiling it.

It replaces some usages of java.lang.String by usages of java.util.regex.Pattern. The cleanup is done only if it is sure that the string is used as a regular expression. If there is any doubt, nothing is done. The regular expression must be explicitly used several times to be sure the cleanup is useful.

To select the clean up, invoke Source > Clean Up…​, use a custom profile, and on the Configure…​ dialog select Precompiles reused regular expressions on the Optimization tab.

regex preferences

For the given code:

regex before

You get this after the clean up:

regex after
String.format quickfix

A new quickfix has been added to replace string concatenation with String.format, similar to the existing ones for StringBuilder and MessageFormat.

String.format quickfix
Method reference quickfix

A new quickfix has been added to create missing methods for method references.

Current restriction is that this quickfix is only available on current class.

Expect current implementation to work on simple cases only.

Method references invoking nested generics or type parameters might be problematic to resolve correct.

methodreference 1

Java Views and Dialog

Toggle Code Minings From Find Actions Menu

The code minings within an editor can be enabled/disabled through the Find Actions menu (Ctrl+3).

toggle code minings

Java Formatter

Assert statement wrapping

A new setting in the Formatter profile controls line wrapping of assert statements. A line wrap can be added between the assert condition and its error message. The setting can be found in the Profile Editor (Preferences > Java > Code Style > Formatter > Edit…​) in the Line Wrapping > Wrapping Settings > Statemtens > 'assert' messages node.

formatter wrap assert


Anonymous class instance in evaluation

The JDT debugger is now capable of inspecting/evaluating expressions with anonymous class instances.

anon instance inspection code
anon instance inspection
JEP 358: Helpful NullPointerExceptions

The JDT debugger has now a checkbox option to activate the command line support for JEP 358. This is disabled below Java 14 and enabled by default for Java programs launched with Java 14 and above.



JVM is now capable of analyzing which variable was null at the point of NullPointerException and describe the variable with a null-detail message in the NPE.

Actual type in Variables view

The option Show Type Names in the Variables and Expressions views now displays the value’s actual type instead of its declared type. This simplifies debugging especially when variable details (toString()) is shown As the label for all variables.

To enable Show Type Names in the Variables view, column mode must be disabled (View Menu > Layout > Show Columns).


Object s = "some string";
      	Collection<?> c = Arrays.asList(s, 1);
      	// breakpoint
variables actual type

And more…​

You can find more noteworthy updates in on this page.

What is next?

Having JBoss Tools 4.17.0 and Red Hat CodeReady Studio 12.17 out we are already working on the next release.


Jeff Maury

by jeffmaury at October 13, 2020 09:57 AM

e(fx)clipse 3.7.0 is released

by Tom Schindl at October 12, 2020 06:50 PM

We are happy to announce that e(fx)clipse 3.7.0 has been released. This release contains the following repositories/subprojects:

There are almost no new features (eg the new boxshadow) but only bugfixes who are very important if you use OpenJFX in an OSGi-Environment.

For those of you who already use our pom-First approache the new bits have been pushed to and the Sample application at has been updated to use the latest release.

by Tom Schindl at October 12, 2020 06:50 PM

Getting started with Eclipse GEF – the Mindmap Tutorial

by Tamas Miklossy ( at October 12, 2020 06:00 AM

The Eclipse Graphical Editing Framework is a toolkit to create graphical Java applications either integrated in Eclipse or standalone. The most common use of the framework is to develop diagram editors, like a simple Mindmap editor we will create in the GEF Mindmap Tutorial series. Currently, the tutorial consists of 6 parts and all together 19 steps. They are structured as follows:


Part I – The Foundations

  • Step 1: Preparing the development environment
  • Step 2: Creating the model
  • Step 3: Defining the visuals


  • Step 4: Creating the GEF parts
  • Step 5: Models, policies and behaviors
  • Step 6: Moving and resizing a node

Part III – Adding nodes and connections

  • Step 7: Undo and redo operations
  • Step 8: Creating new nodes
  • Step 9: Creating connections

Part IV – Modifying and removing nodes

  • Step 10: Deleting nodes (1)
  • Step 11: Modifying nodes
  • Step 12: Creating feedback
  • Step 13: Deleting nodes (2)

Part V – Creating an Eclipse editor

  • Step 14: Creating an Eclipse editor
  • Step 15: Undo, redo, select all and delete in Eclipse
  • Step 16: Contributing toolbar actions

Part VI – Automatic layouting

  • Step 17: Automatic layouting via GEF layout
  • Step 18: Automatic layouting via Graphviz DOT
  • Step 19: Automatic layouting via the Eclipse Layout Kernel

You can register for the tutorial series using the link below. The article How to set up Eclipse tool development with OpenJDK, GEF, and OpenJFX describes the necessary steps to properly set up your development environment.

Your feedback regarding the Mindmap Tutorial (and the Eclipse GEF project in general) is highly appreciated. If you have any questions or suggestions, please let us know via the Eclipse GEF forum, or create an issue on Eclipse Bugzilla.

For further information, we recommend to take a look at the Eclipse GEF blog articles and watch the Eclipse GEF session on the EclipseCon Europe 2018.


by Tamas Miklossy ( at October 12, 2020 06:00 AM

Eclipse Collections 10.4.0 Released

by Nikhil Nanivadekar at October 09, 2020 08:36 PM

View of the Grinnell Glacier from overlook point after a grueling 9 mile hike

This is a release which we had not planned for, but we released it nonetheless.

This must be the first time since we open sourced Eclipse Collections that we performed two releases within the same month.

Changes in Eclipse Collections 10.4.0

There are only 2 changes in the 10.4.0 release compared to the feature rich 10.3.0 release viz.

  • Added CharAdapter.isEmpty(), CodePointAdapter.isEmpty(), CodePointList.isEmpty(), as JDK-15 introduced CharSequence.isEmpty().
  • Fixed Javadoc errors.

Why was release 10.4.0 necessary?

In today’s rapid deployment world, it should not be a novel aspect that a project performs multiple releases. However, the Eclipse Collections maintainer team, performs releases when one or more of the below criteria are satisfied:

  1. A bulk of features are ready to be released
  2. A user requests a release for their use case
  3. JDK-EA compatibility is breaking
  4. It has been more than 6 months that a version is released

The Eclipse Collections 10.4.0 release was necessary due to point #3. Eclipse Collections participates in the Quality Outreach program of Open JDK. As a part of this program the library is expected to test the Early Access (EA) versions of Java and identify potential issues in the library or the JDK. I had missed setting up the JDK-15-EA builds until after Eclipse Collections 10.3.0 was released. After setting up the JDK-15-EA builds on 16 August 2020, I found compiler issues in the library due to isEmpty() added as a default method on CharSequence. Stuart Marks has written an in-depth blog of why this new default method broke compatibility. So, we had 2 options, let the library not be compatible with JDK-15, or release a new version with the fix. The Eclipse Collections team believes in supporting Java versions from Java 8 to Java-EA. After release 10.3.0, we had opened a new major version target (11.0.0), but the changes required did not warrant a new major version. So, we decided to release 10.4.0 with the fixes to support JDK-15. Eclipse Collections 10.4.0 release is compatible with JDK-15 and JDK-16-EA.

Thank you

To the vibrant and supportive Eclipse Collections community on behalf of contributors, committers, and maintainers for using Eclipse Collections. We hope you enjoy Eclipse Collections 10.4.0.

I am a Project Lead and Committer for the Eclipse Collections OSS project at the Eclipse Foundation. Eclipse Collections is open for contributions.

Show your support, star us on GitHub.

Eclipse Collections Resources:
Eclipse Collections comes with it’s own implementations of List, Set and Map. It also has additional data structures like Multimap, Bag and an entire Primitive Collections hierarchy. Each of our collections have a rich API for commonly required iteration patterns.

  1. Website
  2. Source code on GitHub
  3. Contribution Guide
  4. Reference Guide

Photo of the blog: I took the photo after hiking to the Grinnell Glacier overlook point. It was a strenuous hike, but the view from up top made it worth it. I picked this photo, to elaborate the sense of accomplishment after completing a release in a short amount of time.

Eclipse Collections 10.4.0 Released was originally published in Oracle Groundbreakers on Medium, where people are continuing the conversation by highlighting and responding to this story.

by Nikhil Nanivadekar at October 09, 2020 08:36 PM

Eclipse ioFog Wins IoT Edge Computing Excellence Award

by Thabang Mashologu at October 09, 2020 08:06 PM

Edge computing has become one of the most transformative technologies in the world. Rapid advancements in AI, IoT, and 5G solutions are being enabled through edge computing architectures. As a recognized leader in open source technologies, the Eclipse Foundation has made edge computing an important focus area through our Eclipse IoT Working Group and Edge Native Working Group.

Today, we’re proud to announce that Eclipse ioFog was recognized with the IoT Edge Computing Excellence award from IoT Evolution. 

“The Edge of the network is increasingly the home of real-time, actionable intelligence in the IoT, and the IoT industry needs to develop excellence at the Edge in order to fulfill its potential,” said Ken Briodagh, editorial director for IoT Evolution. “In selecting the winners, it is easy to see why these companies and their solutions have risen to the top.”

Started with an initial contribution from Edgeworx, ioFog is a fully mature and widely used open source platform designed specifically for the edge. Unlike other open source edge computing projects that primarily consist of roadmaps and specifications, it is a commercial-grade production-ready platform offering a readily available open source solution that enterprises and service providers can use immediately to build new applications and services. 

ioFog aims to simplify and optimize edge development by bringing cloud native architectures to the edge. This approach enables developers to easily manage, orchestrate, and deploy microservices to any edge in the cloud-to-edge continuum. ioFog also provides a true cloud-to-edge solution by seamlessly integrating with Kubernetes, enabling Kubernetes to orchestrate microservices all the way down to the edge.

Congratulations and a big thanks go to the Eclipse ioFog project team led by Edgeworx CEO and Project Lead Kilton Hopkins!

by Thabang Mashologu at October 09, 2020 08:06 PM

ECD Tools Community Update - October 2020

by Brian King at October 07, 2020 10:01 AM

About Us

September was a big month for the ECD Tools WG, but before we jump into these exciting community updates, here is a brief reminder about what we do.

The Eclipse Cloud Development Tools Working Group (ECD Tools WG) is a vendor-neutral open source collaboration that focuses on defining, promoting and implementing tools for cloud-native development.

The ECD Tools WG accelerates the adoption of Cloud IDE and container-based workspace management, through the adoption of standards, engagement with third party developer tool providers, and the promotion of Eclipse projects to cloud developers.


We recently welcomed Intel as a Guest Member. Here is the full member line-up of our rapidly-growing Working Group.



For more information, read these resources:

To become a member, contact us about joining the ECD Tools Working Group.


ECD Tools ecosystem projects are already seeing broad adoption, and there is plenty happening in their respective communities. Here are some of the highlights from September:


Eclipse Theia is an extensible platform to develop multi-language Cloud & Desktop IDEs with state-of-the-art web technologies.

  • Work is being done on installable desktop versions of Theia. We are still early in this process, with the current focus on builds rather than features, but expect more to come.

  • The file system API was added

  • Gitpod, an early Theia adopter, was open-sourced

Theia is a vibrant project with a diverse set of contributors. Here are some ways you can help right now:

Open VSX

Open VSX is an open source registry for VS Code extensions. It is integrated in Theia, and used by Gitpod with more adopters on the way. Other highlights currently include:

  • Supports VSCodium (or any other VS Code fork)

  • We are building community of extension users and maintainers

  • We are in the process of moving to the Eclipse Foundation

How you can get involved:

  • Development - frontend (React) and backend (Spring / SQL / Elasticsearch). Find out more on Github.

  • Help with community building by spreading the word and encouraging publishers to add their extensions


JKube enables hassle-free Cloud-Native Java Application development. It is a collection of plugins and libraries that are used for building container images using Docker, JIB or S2I build strategies. and GLSP

These projects provide domain-specific tools in the cloud.

Eclipse comprises a set of components that facilitate and simplify the adoption of the Eclipse Modeling Framework (EMF) in cloud-based applications.

Eclipse GLSP is an open-source framework for efficiently developing graphical diagram editors for web- and cloud-based tools.

  • has a new tree editor framework

  • There are three related sessions at EclipseCon, more information below

An online Demo is available at


Eclipse Che makes Kubernetes development accessible for developer teams, providing one-click developer workspaces and eliminating local environment configuration for your entire team. Che brings your Kubernetes application into your development environment and provides an in-browser IDE, allowing you to code, build, test and run applications exactly as they run on production from any machine.

  • Experimentation: IntelliJ as a Che editor

  • Che in the CNCF landscape - More on Twitter 

  • DevWorkspace

    • More information on Github here and here.

    • A blog post is on the way

Keep in touch with the Che community on Mattermost.

Upcoming Events

We are working hard to bring more events to you, as learning opportunities and to raise awareness of what we do and how our projects are adopted.


EclipseCon is fast approaching, starting on October 19. ECD Tools will have a solid presence, both on Community Day and during the main sessions. Make sure to register not to miss anything.

19 October

Community Day ECD Tools Session | 19 Oct 2020 - 16:30

20 October

21 October

22 October

Webinar Series

Are you or someone you know working on a Cloud Development Tools project? Share your work with the community! We are starting a webinar series.

We are flexible on format, so sessions could be a presentation, panel, demo, AMA and more. With already nine proposals, you will be in good company.

Even if you do not want to present and just have an idea of a topic you would like to hear about, we would like to hear from you. You can submit your proposals on our webinar form.

Get Involved

The ECD Tools community is growing and there are many ways to keep in touch and to contribute.

  • Join the ECD Tools community mailing list (an Eclipse account is required)

  • For instant messaging, we use Slack and you can join at

  • Get social with us on Twitter @ECDTools and (NEW!) on LinkedIn.  

    • Use the #ECDTools or #EclipseCloudDev hashtags whenever relevant in your posts

    • Ask your company’s social media manager to follow and retweet from official handles

    • Please share news and updates with your own personal networks

  • Author blog posts that mention ECD Tools WG or related projects

    • Write a post about your experience as a member of the ECD Tools community

  • Share your use cases and success stories with

    • Let us know how you are adopting Eclipse projects related to ECD Tools

  • Volunteer to give a webinar / host a virtual meetup

  • Submit talks to event CFPs for ECD Tools awareness

  • Add our community calendar to your calendar to hear about our upcoming events. It’s available in Google Calendar (use the + in the bottom right to add) or ICS format.

by Brian King at October 07, 2020 10:01 AM

Using Dependency Injection in RCP 3 Views and Editors

by Patrick at October 06, 2020 07:47 PM

Most of the teams I work with are creating hybrid Eclipse RCP applications, meaning that they’re working with a combination of the base RCP 4 platform and the Compatibility Layer which supports the traditional extension points and frameworks that the Eclipse IDE itself is based on.

But in these hybrid applications, there is still a lot of opportunity to use newer RCP 4 features, such as:

  • Dependency Injection
  • Lifecycle annotations
  • A live workbench model based on EMF
  • CSS styling

In this post, I want to focus on some very simple ways to incorporate dependency injection into RCP 3 style views and editors.

Using a part site to access the Eclipse context

Dependency injection in Eclipse RCP is supported by a context (basically a map) that contains all of the objects that may potentially be injected. This ranges from workbench model elements (MPart, MWindow, etc) to OSGi services provided by the framework or by your own team.

In RCP 3 parts that extend ViewPart or EditorPart, it’s very easy to access this context programmatically using a part’s site. Essentially, these blocks of code do very similar things.

MPart part = getSite().getService(MPart.class);

MyOsgiService myService = getSite().getService(MyOsgiService.class);
private MPart part;

private MyOsgiService myService;

Once you have access to the context in this way, you can do things like:

  • Use workbench model elements such as MPart to store persisted state. For those of you working with mementos, try working with MPart.getPersistedState() instead.
  • Move away from Activator-based access to resources and in particular OSGi services. If your Activators are full of ServiceTrackers and accessors for OSGi services, you can now directly access these services in your parts.

Using @Inject directly in RCP 3 views (and editors)

While using a part’s site to access the context is a simple way to get started, it’s also possible to use the @Inject annotation directly in RCP 3 parts. For views, this functionality has been available since Oxygen.

To make an RCP 3 view (extending ViewPart) injectable, you’ll need to set the inject attribute for the view extension.

Once that is done, you can use DI normally for instance variables and for regular methods. DI is not available for constructors.

Also, though this attribute is only available for views, it’s also possible to turn on injection for editors by adding the following lines of code to your init method.

MPart part = site.getService(MPart.class);

Wrapping up

This is not meant to be an exhaustive description of how to use dependency injection with the Compatibility Layer. Other mechanisms include the e4 Bridge, the e4view element of the views extension point, and using RCP 4-style model fragments. Each of these more advanced mechanisms has trade-offs, but if you want to move in the direction of creating true POJO-style RCP 4 parts, they’re worth looking into.

But if you’re looking for a simple way to access the Eclipse context or use dependency injection without refactoring your existing code too much, I think the mechanisms described here are the best approach.

by Patrick at October 06, 2020 07:47 PM

Obeo's Chronicles, Autumn 2020

by Cédric Brun ( at October 06, 2020 12:00 AM

I can’t believe we are already looking at Q4. I have so much news to share with you!

Eclipse Sirius, Obeo Cloud Platform and Sirius Web:

This last summer we had the pleasure to organize SiriusCon. This one-day event is each year the opportunity for the modeling community to share their experience, and for the development team to provide visibility on what is currently being worked on and how we see the future of the technology. SiriusCon reached 450 attendees from 53 different countries thanks to 13 fabulous speakers !

The latest edition was special to us, it used to be organized at the end of each year but we decided to postpone it for a few months to be ready for an announcement very close to our heart. We’ve been working on bringing on the Web what we love about Sirius for quite a few years already and reached a point where we have a promising product. Now is the time to accelerate, Mélanie Bats announced it during the conference: we are releasing “Sirius Web” as Open-Source and officially started the countdown !

The announcement at SiriusCon 2020

The reactions to this announcement were fantastic with a lot of excitement within the community.

I am myself very excited for several reasons:

Firstly, I expect this decision will, just like Sirius Desktop was released in Open-Source in 2013, a key factor leading to the creation of hundreds of graphical modelers, in the same way currently demonstrated by the Sirius Gallery but now easily accessible through the Web and leveraging all the capabilities this platform brings.

Our vision is to empower the tool specifier from the data structure and tool definition up to the deployment and exploitation of a modeling tool, directly from the browser, end to end and in an integrated and seamless way.

We are not there yet, though as you’ll see the technology is already quite promising.

Obeo Cloud Platform Modeler

Secondly, for Obeo this decision strengthens our product-based business model while being faithful to our “open core” approach. We will offer, through Obeo Cloud Platform a Sirius Web build extended with Enterprise features, to deploy on public, private clouds or on premise and including support and upgrade guarantees.

Obeo Cloud Platform Offer

Since the announcement the team is working on Sirius Web to publish it as an Open-Source product so that you can start experimenting as soon as EclipseCon 2020. Mélanie will present this in detail during her talk: “Sirius Web: 100% open source cloud modeling platform” ,

EclipseCon 2020

Hint: it’s still time to register for EclipseCon 2020 but do it quickly! The program committee did an excellent job in setting up an exciting program thanks to your many submissions, don’t miss it!

Capella Days Online is coming up!

That’s not it! Each day we see Eclipse Capella get more and more adoption across the globe, this Open-Source product has its own 4-days event: Capella Days Online 2020!

A unique occasion to get many experience reports from multiple domains: Space systems (CNES and GMV), Rail and transportation (Virgin Hyperloop, Nextrail and Vitesco technologies), healthcare (Siemens and Still AB), waste collecting with The SeaCleaners and all of that in addition to aerospace, defence and security with Thales Group. The program is packed with high-quality content: 12 sessions over 4 days from October 12th to 15th, more than 500 attendees already registered, join us and register!

Capella Days
Capella Days Program

SmartEA 6.0 supports Archimate 3.1 and keeps rising!

We use those open-source technologies, like Eclipse Sirius, Acceleo, EMF Compare, M2doc and many more in our “off the shelf” software solution for Enterprise Architecture: Obeo SmartEA.

SmartEA 6.0

This spring we released SmartEA 6.0, which got the Archimate 3.1 certification and brought among many other improvements: new modeling capabilities, extended user management, enhanced BPMN modeling and streamlined user experience.

Our solution is a challenger on the market and convinces more and more customers. Stay tuned, I should be able to share a thrilling announcement soon!

World Clean Up Day and The SeaCleaners

In a nutshell: an excellent dynamic on many fronts and exciting challenges ahead! This is all made possible thanks to the energy and cohesion of the Obeo team in this weird, complex and unusual time. We are committed to the environment and to reduce plastic waste, as such we took part in the World Clean Up Day in partnership with The Sea Cleaners . Beyond the impact of this action which has so much sense to us, it was also a sharing and fun moment!

#WeAreObeo at the World Cleanup Day

Obeo's Chronicles, Autumn 2020 was originally published by Cédric Brun at CEO @ Obeo on October 06, 2020.

by Cédric Brun ( at October 06, 2020 12:00 AM

MapIterable.getOrDefault() : New but not so new API

by Nikhil Nanivadekar at September 23, 2020 02:30 AM

MapIterable.getOrDefault() : New but not so new API

Sunset at Port Hardy (June 2019)

Eclipse Collections comes with it’s own List, Set, and Map implementations. These implementations extend the JDK List, Set, and Map implementations for easy interoperability. In Eclipse Collections 10.3.0, I introduced a new API MapIterable.getOrDefault(). In Java 8, Map.getOrDefault() was introduced, so what makes it a new API for Eclipse Collections 10.3.0? Technically, it is new but not so new API! Consider the code snippets below, prior to Eclipse Collections 10.3.0:

MutableMap.getOrDefault() compiles and works fine
ImmutableMap.getOrDefault() does not compile

As you can see in the code, MutableMap has getOrDefault() available, however ImmutableMap does not have it. But there is no reason why ImmutableMap should not have this read-only API. I found that MapIterable already had getIfAbsentValue() which has the same behavior. Then why did I still add getOrDefault() to MapIterable?

I added MapIterable.getOrDefault() mainly for easy interoperability. Firstly, most Java developers will be aware of the getOrDefault() method, only Eclipse Collections users would be aware of getIfAbsentValue(). By providing the API same as the JDK it reduces the necessity to learn a new API. Secondly, even though getOrDefault() is available on MutableMap, it is not available on the highest Map interface of Eclipse Collections. Thirdly, I got to learn a Java compiler check which I had not experienced before. I will elaborate this check a bit more in detail because I find it interesting.

After I added getOrDefault() to MapIterable, various Map interfaces in Eclipse Collections started giving compiler errors with messages like: inherits unrelated defaults for getOrDefault(Object, V) from types and java.util.Map. This I thought was cool, because at compile time, the Java compiler is ensuring that if there is an API with default implementation in more than one interface in a multi-interface scenario, then Java will not decide which implementation to pick but rather throw compiler errors. Hence, Java ensures at compile time that there is no ambiguity regarding which implementation will be used at runtime. How awesome is that?!? In order to fix the compile time errors, I had to add a default implementations on the interfaces which gave the errors. I always believe in Compiler Errors are better than Runtime Exceptions.

Stuart Marks has put together an awesome blog which covers the specifics of such scenarios. I suggest reading that for in-depth understanding of how and why this behavior is observed.

Post Eclipse Collections 10.3.0 the below code samples will work:

MapIterable.getOrDefault() compiles and works fine
MutableMap.getOrDefault() compiles and works fine
ImmutableMap.getOrDefault() compiles and works fine

Eclipse Collections 10.3.0 was released on 08/08/2020 and is one of our most feature packed releases. The release constitutes numerous contributions from the Java community.

I am a Project Lead and Committer for the Eclipse Collections OSS project at the Eclipse Foundation. Eclipse Collections is open for contributions.

Show your support star us on GitHub.

Eclipse Collections Resources:
Eclipse Collections comes with it’s own implementations of List, Set and Map. It also has additional data structures like Multimap, Bag and an entire Primitive Collections hierarchy. Each of our collections have a rich API for commonly required iteration patterns.

  1. Website
  2. Source code on GitHub
  3. Contribution Guide
  4. Reference Guide

by Nikhil Nanivadekar at September 23, 2020 02:30 AM

Using gRPC-java code generation to create OSGi Services

by Scott Lewis ( at September 22, 2020 04:21 PM

OSGi Services are usually first created by declaring a java service interface class.  As an OSGi service, this interface class serves as both the name for the service in the service registry, and defines the service contract (i.e. the interface method signatures...i.e. the method name, argument types, and return types) for that version of the service.

gRPC (Google RPC) is a popular and high-performance rpc approach that allows developers to define networked services based upon protocol buffers (proto3).

By extending bndtools recently-added code generation capability, it's now possible to generate an OSGi (remote) service API from just a proto3 service declaration.  All the classes necessary for an OSGi Remote Service API (service interface, arg and return types) can be generated by bndtools within Eclipse from a single proto3 file, immediately and completely.

Ready to implement-and-consume OSGi Services can be generated by Eclipse+bndtools + a proto3 service declaration.

Further, the proto3 service declaration can be modified, and the tooling will immediately generate new service API classes, compile, and package them into a bundle, all from within Eclipse+bndtools.

To get this bndtools-grpc generation with an example see here.

by Scott Lewis ( at September 22, 2020 04:21 PM

5 Talks Java Developers Won’t Want to Miss at EclipseCon 2020

by Tanja Obradovic at September 22, 2020 12:57 PM

Java is a major technology focus area for many members of the Eclipse community, and EclipseCon is always a great opportunity to expand and deepen your knowledge in this space. Last year’s EclipseCon featured about 20 Java-related sessions, and they’ve been popular YouTube replays.

This year’s EclipseCon features another great lineup of Java-related sessions, including talks on Jakarta EE, Eclipse MicroProfile, and Java Development Tools (JDT). To help you plan your EclipseCon 2020 experience, here are brief summaries of five talks you won’t want to miss:

·      Boost your APIs With GraphQL. GraphQL is an open source API query language originally developed by Facebook. Jean-François James will explain how GraphQL relates to REST and how it can be used. To demonstrate the potential, Jean-François will show you an Eclipse MicroProfile GraphQL project.

·      What's New in Java? With its six-month release cycle and preview features, Java evolves at a rapid pace. Manoj Palat will explore Java 14 and Java 15 features, including switch expressions, records, text blocks, pattern InstanceOf, and sealed types to help you understand how and when to use them. Manoj will also review features in upcoming Java releases

·      What's New in JDT? Since last year’s EclipseCon, there have been four Eclipse JDT releases. Jeff Johnston will take you through new JDT features, focusing on those that aren’t part of supporting new Java language features. You’ll learn about new cleanup and quick fixes, enhanced completion support, formatting, and debug enhancements. Jeff will also provide live demos of the features and share related code samples.

·      AdoptOpenJDK — Making Java Free Again. With more than 140 million downloads in the last year, AdoptOpenJDK is a serious contender for production use of Java. Hendrik Eggers and George Adams will explain how they use AdoptOpenJDK to build on more than 15 different platforms, execute more than 87 million tests, and distribute OpenJDK binaries to millions of users. They’ll also explain how AdoptOpenJDK binaries compare to the Java binaries you use today.

·      Make your Microservices as Robust as Mission-Critical Systems With MicroProfile and Jakarta EE. Kenji Kazumura explains how to use and fine-tune Eclipse MicroProfile functions, such as fault tolerance, metrics, and OpenTracing to build microservices for mission-critical enterprise systems. You’ll also learn how to use these parameters in conjunction with Istio and tools such as Grafana and Kiali to monitor microservices.


Register for EclipseCon 2020 Today

EclipseCon is a virtual event this year and it’s being held October 19-22. There’s no cost to attend the sessions, but you do need to register. Space is limited, so be sure to register early to reserve your spot.

Get all the registration details and register now.

 For event details, visit

To join the EclipseCon conversation and get the latest updates:

·      Use #EclipseCon on social media

·      Follow @EclipseCon on Twitter

And stay tuned for more insight into EclipseCon 2020. Our upcoming blogs will focus on:

·      Community Day events

·      Tips to get the most out of EclipseCon

by Tanja Obradovic at September 22, 2020 12:57 PM

Migrating from Fabric8 Maven Plugin to Eclipse JKube 1.0.0

by Rohan Kumar at September 21, 2020 07:00 AM

The recent release of Eclipse JKube 1.0.0 means that the Fabric8 Maven Plugin is no longer supported. If you are currently using the Fabric8 Maven Plugin, this article provides instructions for migrating to JKube instead. I will also explain the relationship between Eclipse JKube and the Fabric8 Maven Plugin (they’re the same thing) and introduce the highlights of the new Eclipse JKube 1.0.0 release. These migration instructions are for developers working on the Kubernetes and Red Hat OpenShift platforms.

Eclipse JKube is the Fabric8 Maven Plugin

Eclipse JKube and the Fabric8 Maven Plugin are one and the same. Eclipse JKube was first released in 2014 under the name of Fabric8 Maven Plugin. The development team changed the name when we pre-released Eclipse JKube 0.1.0 in December 2019. For more about the name change, see my recent introduction to Eclipse JKube. This article focuses on the migration path to JKube 1.0.0.

What’s new in Eclipse JKube 1.0.0

If you are hesitant about migrating to JKube, the following highlights from the new 1.0.0 release might change your mind:

Fabric8 Maven Plugin generates both Kubernetes and Red Hat OpenShift artifacts, and it automatically detects and deploys resources to the underlying cluster. But developers who use Kubernetes don’t need OpenShift artifacts, and OpenShift developers don’t need Kubernetes manifests. We addressed this issue by splitting Fabric8 Maven Plugin into two plugins for Eclipse JKube: Kubernetes Maven Plugin and OpenShift Maven Plugin.

Eclipse JKube migration made easy

Eclipse JKube has a migrate goal that automatically updates Fabric8 Maven Plugin references in your pom.xml to the Kubernetes Maven Plugin or OpenShift Maven Plugin. In the next sections, I’ll show you how to migrate a Fabric8 Maven Plugin-based project to either platform.

Replace the code for the Fabric8 Maven plugin with either the code for the Kubernetes Maven plugin or the OpenShft Maven plugin.

For demonstration purposes, we can use my old random generator application, which displays a random JSON response at a /random endpoint. To start, clone this repository:

$ git clone
cd fmp-demo-project

Then build the project:

$ mvn clean install

Eclipse JKube migration for Kubernetes users

Use the following goal to migrate to Eclipse JKube’s Kubernetes Maven Plugin. Note that we have to specify a complete artifactId and groupId because the plugin is not automatically included in the pom.xml:

$ mvn org.eclipse.jkube:kubernetes-maven-plugin:migrate

Here are the logs for the migrate goal:

fmp-demo-project : $ mvn org.eclipse.jkube:kubernetes-maven-plugin:migrate
[INFO] Scanning for projects...
[INFO] ----------------------< meetup:random-generator >-----------------------
[INFO] Building random-generator 0.0.1
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] --- kubernetes-maven-plugin:1.0.0-rc-1:migrate (default-cli) @ random-generator ---
[INFO] k8s: Found Fabric8 Maven Plugin in pom with version 4.4.1
[INFO] k8s: Renamed src/main/fabric8 to src/main/jkube
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  3.154 s
[INFO] Finished at: 2020-09-08T19:32:01+05:30
[INFO] ------------------------------------------------------------------------
fmp-demo-project : $

You’ll notice that all of the Fabric8 Maven Plugin references have been replaced by references to Eclipse JKube. The Kubernetes Maven Plugin is the same as the Fabric8 Maven Plugin. The only differences are the k8s prefix and that it generates Kubernetes manifests.

Once you’ve installed the Kubernetes Maven Plugin, you can deploy your application as usual:

$ mvn k8s:build k8s:resource k8s:deploy

Eclipse JKube migration for OpenShift users

Use the same migration process for the OpenShift Maven Plugin as you would for the Kubernetes Maven Plugin. Run the migrate goal but with the OpenShift MavenPlugin specified:

$ mvn org.eclipse.jkube:openshift-maven-plugin:migrate

Here are the logs for this migrate goal:

fmp-demo-project : $ mvn org.eclipse.jkube:openshift-maven-plugin:migrate
[INFO] Scanning for projects...
[INFO] ----------------------< meetup:random-generator >-----------------------
[INFO] Building random-generator 0.0.1
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] --- openshift-maven-plugin:1.0.0-rc-1:migrate (default-cli) @ random-generator ---
[INFO] k8s: Found Fabric8 Maven Plugin in pom with version 4.4.1
[INFO] k8s: Renamed src/main/fabric8 to src/main/jkube
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.227 s
[INFO] Finished at: 2020-09-08T19:41:34+05:30
[INFO] ------------------------------------------------------------------------

This goal replaces all of your Fabric8 Maven Plugin references with references to OpenShift Maven Plugin. You can then deploy your application to Red Hat OpenShift just as you normally would:

$ mvn oc:build oc:resource oc:deploy


See the Eclipse JKube migration guide for more about migrating from the Fabric8 Maven Plugin on OpenShift or Kubernetes. Feel free to create a GitHub issue to report any problems that you encounter during the migration. We really value your feedback, so please report bugs, ask for improvements, and tell us about your migration experience.

Whether you are already using Eclipse JKube or just curious about it, don’t be shy about joining our welcoming community:


The post Migrating from Fabric8 Maven Plugin to Eclipse JKube 1.0.0 appeared first on Red Hat Developer.

by Rohan Kumar at September 21, 2020 07:00 AM

After eight: How to set up Eclipse tool development with OpenJDK, GEF, and OpenJFX for newer Java versions

by Svenja Wendler ( at September 18, 2020 08:00 AM

The article describes the solution to possible stumbling blocks in overcoming a transition from Oracle JDK to OpenJDK 11 in PDE development with GEF and JavaFX.

Eclipse development with Java and JavaFX

"Legacy – with concrete feet into the future" I read in an announcement and wondered whether Java 8 will soon be on the way to the technological future with concrete shoes. But before this happens, we prefer to strip them off and migrate to an up-to-date Java version.

We will focus on an eclipse-based application with JavaFX components below. The conversion is to be made to the latest Java-LTE version, i.e. Java 11. The following survey shows that many developers are still cautious about migrating to higher versions of Java:


JavaFX is no longer a JRE component from Java 11

The first hurdle is already apparent when switching to Java 11, because JavaFX is no longer part of the JDK, either at Oracle or in the open source distribution OpenJDK. There are several solutions to this problem. One would be to use a JDK distribution that delivers Java 11 with JavaFX, such as Bellsoft's Liberica JDK. However, this article focuses on using e(fx)clipse and the OpenJFX SDK.

We use JavaFX in our YAKINDU products and have successfully and successfully converted the development of the GEF framework to the following configuration:

In the following we on the one hand convert our development environment to OpenJDK 11 with OpenJFX and e(fx)clipse, and then turn to the transition for our development, including compiler and launch configurations.

Transforming the development environment

We download and install a new Eclipse IDE, ideally for Eclipse committers.

We upload OpenJDK 11to any directory.

We download OpenJFX SDKand store it in a directory.

We install e(fx)clipse at least in version 3.6.0 in our Eclipse environment (Update-Site:

We finish Eclipse and insert the following lines below the "-vmargs" line into the eclipse.ini file ("---add-modules=ALL-SYSTEM" does not need to be re-inserted if already available):

Files\Java\javafx-sdk-11.0.2\lib --add-modules=ALL-SYSTEM

Note: We adjust the path to the OpenJFX libraries according to the operating system and the location in the file system. We don't use quotation marks, even if the path contains spaces. Otherwise, the setting would be tacitly ignored. Furthermore, the path must not be terminated with a slash or backslash. The changes to the eclipse.ini must be made after the installation of e(fx)clipse, otherwise Eclipse will not start again.

If OpenJDK 11 is the only JDK installed, nothing else needs to be changed. If OpenJDK 11 is not installed, but is only unpacked or other Java versions are installed on the computer, then the following lines should also be inserted in the eclipse.ini directly above the "-vmargs" line:

/path/to/jdk-11.0.5+10/Contents/Home/bin (adapt to your directory)

Now let's start Eclipse again. We then install the end-user tools of GEF DOT via the eclipse release update site (for example,

These use JavaFX (and SWT integration) so we can check if our installation worked. If successful, the "DOT Graph" view should look like this:

Possible source of error here are the settings in the eclipse.ini, which we should look again step by step.

Possible source of error here are the settings in the eclipse.ini, which we should look again step by step.

If the IDE finally runs successfully with OpenJDK 11, OpenJFX 11 and e(fx)clipse, we now take care of the workspace and the runtime.

Transforming the development

In order to change the trend, the following must be done:

  • Set OpenJDK as JRE to use
  • Ensure that this JRE is used as an execution environment
  • Set the openjfx-libs folder in the e(fx)clipse preferences

These changes should compile the workspace. The following section describes these steps in more detail.

We set OpenJDK as a runtime environment in the Eclipse preferences. To do this, we select  „Window → Preferences → Java → Installed JREs → Add … and the path to the bin directory of the JDK.

We make sure that this JDK is applied to the execution environment we set. If necessary, we may remove all other JDKs to ensure that the OpenJDK is actually used:

We set the OpenJFX SDK in the preferences for e(fx)clipse. Above, we saved the OpenJFX SDK to a directory. Its lib directory must be in the Eclipse Preferences (Window → Preferences → JavaFX) JavaFX 11 + SDK. This should be the same path as before in the eclipse.ini. This setting makes your Eclipse aware of the JavaFX libraries for development.

Now everything is done to compile the workspace. If we want to start the application in the runtime, there is still a small thing to do.

We'll add the following VM arguments in the launch configuration; they are the same ones that we have previously entered in the eclipse.ini :


If necessary, you can load the sources ( of the GEF framework into the workspace and try out the above points directly. For more information on GEF development, see the developer documentation page:


The procedure above should be used to switch existing Eclipse applications to OpenJDK 11 and OpenJFX 11 with e(fx)clipse.

Are there any comments or questions about this approach?

We welcome any kind of feedback.

by Svenja Wendler ( at September 18, 2020 08:00 AM

WTP 3.19 Released!

September 16, 2020 10:55 PM

The Eclipse Web Tools Platform 3.19 has been released! Installation and updates can be performed using the Eclipse IDE 2020-09 Update Site or through the Eclipse Marketplace . Release 3.19 is included in the 2020-09 Eclipse IDE for Enterprise Java Developers , with selected portions also included in several other packages . Adopters can download the R3.19.0 p2 repository directly and combine it with the necessary dependencies.

More news

September 16, 2020 10:55 PM

JBoss Tools 4.17.0.AM1 for Eclipse 2020-09

by jeffmaury at September 16, 2020 01:27 PM

Happy to announce 4.17.0.AM1 (Developer Milestone 1) build for Eclipse 2020-09.

Downloads available at JBoss Tools 4.17.0 AM1.

What is New?

Full info is at this page. Some highlights are below.


Support for YAML configuration file

Quarkus supports configuration through YAML format. For more information, see the Quarkus documentation

In order to use it, follow the steps:

  • create a Quarkus project using the new Quarkus wizard

  • create a new application.yaml or application.yml next to the in src/main/resources

The editor will open and you will get content assist and syntax validation.

Hibernate Tools

A number of additions and updates have been performed on the available Hibernate runtime providers.

New Runtime Provider

A new runtime provider has been added for Hibernate 6.0. It incorporates Hibernate Core version 6.0.0.Alpha6 and Hibernate Tools version 6.0.0.Alpha2.

Runtime Provider Updates

The Hibernate 5.4 runtime provider now incorporates Hibernate Core version 5.4.21.Final and Hibernate Tools version 5.4.21.Final.

The Hibernate 5.3 runtime provider now incorporates Hibernate Core version 5.3.18.Final and Hibernate Tools version 5.3.18.Final.


Jeff Maury

by jeffmaury at September 16, 2020 01:27 PM

Browser like BoxShadow for JavaFX coming with e(fx)clipse 3.7.0

by Tom Schindl at September 16, 2020 09:54 AM

Using BoxShadow is a very common thing in modern UIs, so it might not be suprising that designers defining UIs often also use them heavily.

Unfortunately JavaFX has NO 100% compatible effect and even worse one who is closest (DropShadow) leads to a massive performance hit as shown in this video

On the left hand side is a Node who has a DropShadow-Effect applied to it and you notice that once the effect is applied that the animation isn’t smooth any more. On the right hand side you see a new Node we’ll release with e(fx)clipse 3.7.0 who provides a new BoxShadow-Node (named BoxShadow2).

Beside getting a huge performance win, the BoxShadow-Node uses the same semantics the browser counterpart does so you can port CSS definition to your JavaFX-Application.

For completness here’s the code for this demo video.

package org.eclipse.fx.ui.controls.demo;

import org.eclipse.fx.ui.controls.effects.BoxShadow2;

import javafx.animation.Animation;
import javafx.animation.Animation.Status;
import javafx.animation.TranslateTransition;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.effect.DropShadow;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Region;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Duration;

public class InTheShadow extends Application {

	public static void main(String[] args) {

	public void start(Stage primaryStage) throws Exception {
		BorderPane p = new BorderPane();
		p.setPadding(new Insets(20));

		Button shadowMe = new Button("Toggle Shadow");

		Region pane;

		if (Boolean.getBoolean("efxclipse-shadow")) {
			BoxShadow2 shadow = new BoxShadow2(createComplexUI());
			pane = shadow;
		} else {
			pane = new StackPane(createComplexUI());


		shadowMe.setOnAction(evt -> toggleShadow(pane));

		Scene s = new Scene(p, 1200, 800);
		primaryStage.setTitle("efxclipse-shadow: " + Boolean.getBoolean("efxclipse-shadow"));

	private void toggleShadow(Region pane) {
		if (pane instanceof BoxShadow2) {
			BoxShadow2 s = (BoxShadow2) pane;
		} else {
			if (pane.getEffect() != null) {
			} else {
				DropShadow dropShadow = new DropShadow();
				dropShadow.setColor(Color.color(0.4, 0.5, 0.5));

	private Node createComplexUI() {
		StackPane pane = new StackPane();
		pane.setStyle("-fx-background-color: white");

		for (int i = 0; i < 100; i++) {
			Button b = new Button("Button " + i);
			b.setTranslateX(i % 100);

		Button animated = new Button("Animated");
		StackPane.setAlignment(animated, Pos.BOTTOM_CENTER);

		TranslateTransition t = new TranslateTransition(Duration.millis(1000), animated);
		animated.setOnAction(evt -> {
			if (t.getStatus() == Status.RUNNING) {
			} else {;


		return pane;


by Tom Schindl at September 16, 2020 09:54 AM

N4JS goes LSP

by n4js dev ( at September 08, 2020 11:00 AM

A few weeks ago we started to publish a VSCode extension for N4JS to the VSCode Marketplace. This was one of the last steps on our road to support LSP-based development tools. We chose to make this major change because of several reasons that affected both users and developers of N4JS.

An N4JS project in VSCode with the N4JS language extension

Our language extension for N4JS is hosted at the Microsoft VSCode Marketplace and will be updated regularly by our Jenkins jobs. Versions will be kept in sync with the language version, compiler version and version of the N4JS libraries to avoid incompatible setups. At the moment, the LSP server supports all main features of the language server protocol (LSP) such as validation, content assist, outline view, jump to definition and implementation, open symbol, the rename refactoring and many more. In addition, it will also generate output files whenever a source change is detected. We therefore heavily improved the incremental LSP builder of the Xtext framework and plan to migrate back those changes to the Xtext repository. For the near future we plan to work on stability, performance and also to support some of the less frequently used LSP features.

When looking back, development of N4JS has been based on the Xtext framework from the start and thus it was straightforward to build an Eclipse-based IDE as our main development tool. Later on, we also implemented a headless compiler used for manual and automated testing from the command line. The development of the compiler already indicated some problems stemming from the tight integration of the Eclipse and the Xtext frameworks together with our language specific implementations. To name an example, we had two separate builder implementations: one for the IDE and the other for the headless compiler. Since the Eclipse IDE is using a specific workspace and project model, we also had two implementations for this abstraction. Another important problem we faced with developing an Eclipse-based IDE was that at some points we had to implement UI tests using the SWTBot framework. For us, SWTBot tests turned out to be very hard to develop, to maintain, and to keep from becoming flaky. Shifting to LSP-based development tools, i.e. the headless compiler and an LSP server, allows us to overcome the aforementioned problems.

Users of N4JS now have the option to either use our extension for VSCode or integrate our LSP server into their favorite IDE themselves, even into the Eclipse IDE. They also benefit from more lightweight tools regarding disk size and start-up performance, as well as a better integration into well-known tools from the JavaScript development ecosystem.

by n4js dev ( at September 08, 2020 11:00 AM

Website Updates For Eclipse Foundation AISBL

August 28, 2020 01:25 PM

The Eclipse Foundation recently announced its intention to transition to Europe as part of its continued global expansion.

To support this initiative, we needed to start making some important changes to our website. This week, we made available the first round of these changes!

1. Eclipse Membership

First off, it was essential to rethink how we convey membership information on our website. Our main goal was to organize information effectively and highlight important links such as how to contact us.

We decided to use tabs to make it easier for users to find our membership fees, our membership levels, how to become a member, and our key services.

Folks are no longuer required to navigate between multiple pages to find the information they need.

Screenshot of the Eclipse Membership landing page

2. Eclipse Working Groups

Given that many of our new members are now interested in joining an Eclipse Working Groups, we wanted to make sure that important documents, such as the Working Group Partipation Agreement or the Working Group Charter, were easy to find.

Therefore, we thought changing the layout would help. We highlighted the Resources section to make it really visible on the page and now we have more space to grow and support additional documents in the future.

Screenshot of how we now display Eclipse Working Groups on our website

3. Eclipse Members

Finally, we simplified our Members page, we thought the page would be more interesting by offering a simple list of logos and company name by removing the short description of each member.

Screenshot of Eclipse Members

The Work Ahead

Our focus is now on the required content updates for Eclipse Foundation AISBL.

We created Bug 566455 - Website Updates For Eclipse Foundation AISBL to discuss these remaining changes.

One of those changes is to publish the Eclipse Foundation AISBL Membership Agreement. This is a new agreement that members will be asked to sign as of October. To simplify the signing process, we will allow our members to sign the Membership Agreement with an eSignature.

We also need to update the currency of our membership fees. Our fees will no longer be stated in USD but in Euros.

The list of remaining changes is available via the dependency tree of this project.

Screenshot of dependency tree

To learn more about the Eclipse Foundation transition to Europe, please visit

August 28, 2020 01:25 PM

An update on the Eclipse Foundation’s move to Europe

by Mike Milinkovich at August 20, 2020 10:03 AM

In May we announced that the Eclipse Foundation is becoming a Belgian international nonprofit association. I wanted to take this opportunity to provide you with an update on the progress of the transition, the next steps, and what it all means to our global community of developers and diverse membership base.

Let’s start with where we are in the process. At time of writing, all of the incorporation and related documents have been filed with the Belgian authorities, and we are waiting for the Royal Decree which will formally create our new entity, the Eclipse Foundation AISBL. This normally takes on the order of sixty days and we expect the process to be finalized by early-to-mid October.

In parallel, the Board of Directors of the Eclipse Foundation, Inc. have approved a series of changes to the Bylaws and Membership Agreement of the existing Delaware, USA-based entity and we will be seeking the approval of the membership-at-large for those changes. To our members and committers, please stay tuned for your voting credentials in late August. In addition, some revisions have been made to our IP Policy and Antitrust Policy to enable both our US and Belgian entities to have exactly the same policies.

Once the new Belgian entity Eclipse Foundation AISBL is created and the approvals are finalized to the Eclipse Foundation, Inc.’s Bylaws and Membership Agreement, all members will be required to update their Membership Agreement and related other agreements. You will be asked to join Eclipse Foundation AISBL, and to resign your membership in the existing US organization. At the same time, we will be asking you to re-sign your Member Committer and Contribution Agreement (MCCA) and any Working Group Participation Agreements.

So exactly what’s changing?

As part of moving to European-based governance, effective October 1st we will be restating our membership dues for both the Belgian-based Eclipse Foundation AISBL and the existing Eclipse Foundation, Inc. in euros while retaining the same numeric value. So if you are currently paying $20,000, the dues in the new organization will be 20.000€. We understand that due to currency exchange rates this represents an increase in  dues. To help mitigate that, all members who renew between October 1, 2020 and September 30, 2021 will have their euro-based membership fees discounted by 10%. This modest increase is the first fee increase we have had in almost 15 years, and we hope that members appreciate the merit of stating all fees in euros as we complete this transition.

As part of the European transition, we are changing the name of the Solutions Members membership level to Contributing Members. We feel that this will better reflect the current, diverse group of organizations who participate and contribute to the Eclipse ecosystem in many ways, including, but not limited to, leading and contributing to our open source projects, and offering products and services based on Eclipse Foundation technologies.

Working Group Participation Agreements (WGPAs) will be updated to reflect the change of the corporate domicile to Belgium, as will the working group charters once approved by the respective Steering Committees. There are no fee changes to any working group participation associated with this transition, though some working groups may decide to restate their fees in Euros at some point in the future, similar to membership fees. As always, the budgets and fees established for each working group are determined by the Steering Committee of the working group.

For our committers, if you are an individual Committer Member you will be asked to execute the new Belgian Membership Agreement. If you have previously executed a committer agreement with the Eclipse Foundation as an individual, then you will need to re-execute the new version of the Individual Contributor Agreement.

For committers who are employees or consultants of a member company who has a Member Committer and Contributor Agreement (MCCA), your employer will be asked to execute the new MCCA, and no actions will be required on your part.

Our new GitLab-based forge physically hosted in Europe is operational and available as a choice for any projects that would like to use it. As we expand our presence in Europe, we anticipate new exciting opportunities for our global community members to participate and contribute in new open source projects. More announcements on this front will be coming soon.

What’s staying the same?

As far as day-to-day interactions with the Eclipse Foundation, nothing will change for member organizations or committer members. Our projects and working groups will continue to run as is, and the recently modified IP Policy and Antitrust Policy of the Eclipse Foundation AISBL are identical to those of the US organization. Eclipse Foundation AISBL will become the steward of the Eclipse Public License and govern our community’s license going forward. The bulk of the Foundation’s operations will continue to be split between Europe and Canada, and you can expect your engagement with the staff of the Foundation to remain unchanged.

When is this all happening?

There are a lot of moving parts with this corporate restructuring, and we ask in advance for both your patience and your active engagement and support. Here are some upcoming key dates that members and committers need to be aware of:

  • August 31, 2020: Voting begins on approving the necessary changes to the Eclipse Foundation, Inc. (EF-US) Bylaws and Membership Agreement. Voting will go until September 29th. The new EF-US Bylaws and Membership Agreement will go into effect as soon as practicable after the completion of the membership vote.
  • October 1, 2020: The new dues structure stated in euros will go into effect. Renewals for existing members will receive a 10% discount for the following twelve months.
  • Soon after the Royal Decree which legally establishes the Eclipse Foundation AISBL we will be contacting all of our members and committers to update their agreements with the new Belgian entity. This may include your membership agreement, committer agreements, and working group participation agreements as applicable.

I hope that this post has helped update you on the execution of the transition and the way forward for the next exciting phase of our community’s expansion. If you have questions or feedback, feel free to reach out to me, or to our team at Thank you for your continued support!


by Mike Milinkovich at August 20, 2020 10:03 AM

No Java? No Problem!

by Ed Merks ( at August 18, 2020 07:50 AM

For the 2020-09 Eclipse Simultaneous Release, the Eclipse IDE will require Java 11 or higher to run.  If the user doesn't have that installed, Eclipse simply won't start, instead popping up this dialog: 

That of course begs the question, what should I do now? The Eclipse Installer itself is an Eclipse application so it too will fail to start for the same reason.  At least on Windows the Eclipse Installer is distributed as a native executable, so it will open a semi-helpful page in the browser to direct the user find a suitable JRE or JDK to install rather than popping up the above dialog.

Of course we are concerned that many users will update 2020-06 to 2020-09 only to find that Eclipse fails to start afterwards because they are currently running with Java 8.  But Mickael Istria has planned ahead for this as part of the 2020-06 release, adding a validation check during the update process to determine if the current JVM is suitable for the update, thereby helping prevent this particular problem.

Now that JustJ is available for building Eclipse products with an embedded JRE, we can do even better.  Several of the Eclipse Packaging Project's products will include a JustJ JRE in the packages for 2020-09, i.e., the C/C++, Rust, and JavaScript packages.  Also the Eclipse Installer for 2020-09 will provide product variants that include a JustJ JRE.  So they all will simply run out of the box regardless of which version of Java is installed and of course even when Java is not installed at all.

Even better, the Eclipse Installer will provide JustJ JREs as choices in the dialogs.  A user who does not have Java installed will be offered JustJ JRE 14.02 as the default JRE.

Choices of JustJ JREs will always be available in the Eclipse Installer; it will be the default only if no suitable version of Java is currently installed on the machine.

Eclipse Installers with an embedded JustJ JRE will be available starting with 2020-09 M3 for all supported platforms.  For a sneak preview, you can find them in the nightly builds folder.  The ones with "-jre" in the name contain an embedded JRE (and the ones with "-restricted" in the name will only install 2020-09 versions of the products).

It was a lot of work getting this all in place, both building the JREs and updating Oomph's build to consume them.  Not only that, just this week I had to rework EMF's build so that it functions with the latest platform where some of the JDT bundles have incremented their BREEs to Java 11.  There's always something disruptive that creates a lot of work.  I should point out that no one funds this work, so I often question how this is all actually sustainable in the long term (not to mention questioning my personal sanity).

I did found a small GmbH here in Switzerland.  It's very pretty here!

If you need help, consider that help is available. If no one pays for anything, at some point you will only get what you pay for, i.e., nothing. But that's a topic for another blog...

by Ed Merks ( at August 18, 2020 07:50 AM

Dogfooding the Eclipse Dash License Tool

by waynebeaton at July 22, 2020 03:43 PM

There’s background information about this post in my previous post. I’ve been using the Eclipse Dash License Tool on itself.

$ mvn dependency:list | grep -Poh "\S+:(system|provided|compile)$" | java -jar licenses.jar -
Querying Eclipse Foundation for license data for 7 items.
Found 6 items.
Querying ClearlyDefined for license data for 1 items.
Found 1 items.
Vetted license information was found for all content. No further investigation is required.
$ _

Note that in this example, I’ve removed the paths to try and reduce at least some of the clutter. I also tend to add a filter to sort the dependencies and remove duplicates (| sort | uniq), but that’s not required here so I’ve left it out.

The message that “[v]etted license information was found for all content”, means that the tool figures that all of my project’s dependencies have been fully vetted and that I’m good to go. I could, for example, create a release with this content and be fully aligned with the Eclipse Foundation’s Intellectual Property Policy.

The tool is, however, only as good as the information that it’s provided with. Checking only the Maven build completely misses the third party content that was introduced by Jonah’s helpful contribution that helps us obtain dependency information from a yarn.lock file.

$ cd yarn
$ node index.js | java -jar licenses.jar -
Querying Eclipse Foundation for license data for 1 items.
Found 0 items.
Querying ClearlyDefined for license data for 1 items.
Found 0 items.
License information could not automatically verified for the following content:

npm/npmjs/@yarnpkg/lockfile/1.1.0 (null)

Please create contribution questionnaires for this content.

$ _

So… oops. Missed one.

Note that the updates to the IP Policy include a change that allows project teams to leverage third-party content (that they believe to be license compatible) in their project code during development. All content must be vetted by the IP due diligence process before it may be leveraged by any release. So the project in its current state is completely onside, but the license of that identified bit of content needs to be resolved before it can be declared as proper release as defined by the Eclipse Foundation Development Process.

This actually demonstrates why I opted to create the tool as CLI that takes a flat list of dependencies as input: we use all sorts of different technologies, and I wanted to focus the tool on providing license information for arbitrary lists of dependencies.

I’m sure that Denis will be able to rewrite my bash one-liner in seven keystrokes, but here’s how I’ve combined the two so that I can get complete picture with a “single” command:

$ { mvn dependency:list | grep -Poh "\S+:(system|provided|compile)$" ; cd yarn && node index.js; } | java -jar licenses.jar -
Querying Eclipse Foundation for license data for 8 items.
Found 6 items.
Querying ClearlyDefined for license data for 2 items.
Found 1 items.
License information could not automatically verified for the following content:

npm/npmjs/@yarnpkg/lockfile/1.1.0 (null)

Please create contribution questionnaires for this content.
$ _

I have some work to do before I can release. I’ll need to engage with the Eclipse Foundation’s IP Team to have that one bit of content vetted.

As a side effect, the tool generates a DEPENDENCIES file. The dependency file lists all of the dependencies provided in the input in ClearlyDefined coordinates along with license information, whether or not the content is approved for use or is restricted (meaning that further investigation is required), and the authority that determined the status.

maven/mavencentral/org.glassfish/jakarta.json/1.1.6, EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0, approved, emo_ip_team
maven/mavencentral/commons-codec/commons-codec/1.11, Apache-2.0, approved, CQ15971
maven/mavencentral/org.apache.httpcomponents/httpcore/4.4.13, Apache-2.0, approved, CQ18704
maven/mavencentral/commons-cli/commons-cli/1.4, Apache-2.0, approved, CQ13132
maven/mavencentral/org.apache.httpcomponents/httpclient/4.5.12, Apache-2.0, approved, CQ18703
maven/mavencentral/commons-logging/commons-logging/1.2, Apache-2.0, approved, CQ10162
maven/mavencentral/org.apache.commons/commons-csv/1.8, Apache-2.0, approved, clearlydefined
npm/npmjs/@yarnpkg/lockfile/1.1.0, unknown, restricted, none

Most of the content was vetted by the Eclipse Foundation’s IP Team (the entries marked “CQ*” have corresponding entries in IPZilla), one was found in ClearlyDefined, and one requires further investigation.

The tool produces good results. But, as I stated earlier, it’s only as good as the input that it’s provided with and it only does what it is designed to do (it doesn’t, for example, distinguish between prerequisite dependencies and dependencies of “works with” dependencies; more on this later). The output of the tool is obviously a little rough and could benefit from the use of a proper configurable logging framework. There’s a handful of other open issues for your consideration.

by waynebeaton at July 22, 2020 03:43 PM

ECF 3.14.12 released - Now with gRPC for OSGi Remote Services

by Scott Lewis ( at July 15, 2020 12:16 AM

ECF 3.14.12 was just released

Highlights of this Release

New OSGi Remote Services Distribution provider based upon gRPC/Protocol Buffers. Along with a grpc-osgi-generator project...which allows the generation of a service API from a proto3 service declaration...this provider allows gRPC-based services to be exported and imported as OSGi Remote Services.  This now includes support for unary, server-streaming, and client-streaming gRPC calls.

Enhanced Support for Bndtools-based development of OSGi Remote Services.   The ECF Bndtools Workspace now includes the latest version of ECF Remote Services, along with the gRPC distribution provider, a Hazelcast-based discovery and distribution provider, and project and bndrun templates for creating, running, testing, and debugging OSGi Remote Services in Eclipse+Bndtools 5.

by Scott Lewis ( at July 15, 2020 12:16 AM

Why ServiceCaller is better (than ServiceTracker)

July 07, 2020 08:00 PM

My previous post spurned a reasonable amount of discussion, and I promised to also talk about the new ServiceCaller which simplifies a number of these issues. I also thought it was worth looking at what the criticisms were because they made valid points.

The first observation is that it’s possible to use both DS and ServiceTracker to track ServiceReferences instead. In this mode, the services aren’t triggered by default; instead, they only get accessed upon resolving the ServiceTracker using the getService() call. This isn’t the default out of the box, because you have to write a ServiceTrackerCustomizer adapter that intercepts the addingService() call to wrap the ServiceTracker for future use. In other words, if you change:

serviceTracker = new ServiceTracker<>(bundleContext, Runnable.class, null);;

to the slightly more verbose:

serviceTracker = new ServiceTracker<>(bundleContext, Runnable.class,
new ServiceTrackerCustomizer<Runnable, Wrapped<Runnable>>() {
public Wrapped<Runnable> addingService(ServiceReference<Runnable> ref) {
return new Wrapped<>(ref, bundleContext);
static class Wrapped<T> {
private ServiceReference<T> ref;
private BundleContext context;
public Wrapped(ServiceReference<T> ref, BundleContext context) {
this.ref = ref;
this.context = context;
public T getService() {
try {
return context.getService(ref);
} finally {

Obviously, no practical code uses this approach because it’s too verbose, and if you’re in an environment where DS services aren’t widely used, the benefits of the deferred approach are outweighed by the quantity of additional code that needs to be written in order to implement this pattern.

(The code above is also slightly buggy; we’re getting the service, returning it, then ungetting it afterwards. We should really just be using it during that call instead of returning it in that case.)

Introducing ServiceCaller

This is where ServiceCaller comes in.

The approach of the ServiceCaller is to optimise out the over-eager dereferencing of the ServiceTracker approach, and apply a functional approach to calling the service when required. It also has a mechanism to do single-shot lookups and calling of services; helpful, for example, when logging an obscure error condition or other rarely used code path.

This allows us to elegantly call functional interfaces in a single line of code:

Class callerClass = getClass();
ServiceCaller.callOnce(callerClass, Runnable.class, Runnable:run);

This call looks for Runnable service types, as visible from the caller class, and then invoke the function getClass() as lambda. We can use a method reference (as in the above case) or you can supply a Consumer<T> which will be passed the reference that is resolved from the lookup.

Importantly, this call doesn’t acquire the service until the callOnce call is made. So, if you have an expensive logging factory, you don’t have to initialise it until the first time it’s needed – and even better, if the error condition never occurs, you never need to look it up. This is in direct contrast to the ServiceTracker approach (which actually needs more characters to type) that accesses the services eagerly, and is an order of magnitude better than having to write a ServiceTrackerCustomiser for the purposes of working around a broken API.

However, note that such one-shot calls are not the most efficient way of doing this, especially if it is to be called frequently. So the ServiceCaller has another mode of operation; you can create a ServiceCaller instance, and hang onto it for further use. Like its single-shot counterpart, this will defer the resolution of the service until needed. Furthermore, once resolved, it will cache that instance so you can repeatedly re-use it, in the same way that you could do with the service returned from the ServiceTracker.

private ServiceCaller<Runnable> service;
public void start(BundleContext context) {
this.service = new ServiceCaller<>(getClass(), Runnable.class);
public void stop(BundleContext context) {
public void doSomething() {;

This doesn’t involve significantly more effort than using the ServiceTracker that’s widely in use in Eclipse Activators at the moment, yet will defer the lookup of the service until it’s actually needed. It’s obviously better than writing many lines of ServiceTrackerCustomiser and performs better as a result, and is in most cases a type of drop-in replacement. However, unlike ServiceTracker (which returns you a service that you can then do something with afterwards), this call provides a functional consumer interface that allows you to pass in the action to take.

Wrapping up

We’ve looked at why ServiceTracker has problems with eager instantiation of services, and the complexity of code required to do it the right way. A scan of the Eclipse codebase suggests that outside of Equinox, there are very few uses of ServiceTrackerCustomiser and there are several hundred calls to ServiceTracker(xxx,yyy,null) – so there’s a lot of improvements that can be made fairly easily.

This pattern can also be used to push down the acquisition of the service from a generic Plugin/Activator level call to where it needs to be used. Instead of standing this up in the BundleActivator, the ServiceCaller can be used anywhere in the bundle’s code. This is where the real benefit comes in; by packaging it up into a simple, functional consumer, we can use it to incrementally rid ourselves of the various BundleActivators that take up the majority of Eclipse’s start-up.

A final note on the ServiceCaller – it’s possible that when you run the callOnce method (or the call method if you’re holding on to it) that a service instance won’t be available. If that’s the case, you get notified by a false return call from the call method. If a service is found and is processed, you’ll get a true returned. For some operations, a no-op is a fine behaviour if the service isn’t present – for example, if there’s no LogService then you’re probably going to drop the log event anyway – but it allows you to take the corrective action you need.

It does mean that if you want to capture return state from the method call then you’ll need to have an alternative approach. The easiest way is to have an final Object result[] = new Object[1]; before the call, and then the lambda can assign the return value to the array. That’s because local state captured by lambdas needs to be a final reference, but a final reference to a mutable single element array allows us to poke a single value back. You could of course use a different class for the array, depending on your requirements.

So, we have seen that ServiceCaller is better than ServiceTracker, but can we do even better than that? We certainly can, and that’s the purpose of the next post.

July 07, 2020 08:00 PM

Why ServiceTracker is Bad (for DS)

July 02, 2020 08:00 PM

In a presentation I gave at EclipseCon Europe in 2016, I noted that there were prolems when using ServiceTracker and on slide 37 of my presentation noted that:

  • is a blocking call
  • results in DS activating services

Unfortunately, not everyone agrees because it seems insane that ServiceTracker should do this.

Unfortunately, ServiceTracker is insane.

The advantage of Declarative Services (aka SCR, although no-one calls it that) is that you can register services declaratively, but more importantly, the DS runtime will present the existence of the service but defer instantiation of the component until it’s first requested.

The great thing about this is that you can have a service which does many class loads or timely actions and defer its use until the service is actually needed. If your service isn’t required, then you don’t pay the cost for instantiating that service. I don’t think there’s any debate that this is a Good Thing and everyone, so far, is happy.


The problem, specifically when using ServiceTracker, is that you have to do a two-step process to use it:

  1. You create a ServiceTracker for your particular service class
  2. You call open() on it to start looking for services
  3. Time passes
  4. You acquire the service form the ServiceTracker to do something with it

There is a generally held mistaken belief that the DS component is not instantiated until you hit step 4 in the above. After all, if you’re calling the service from another component – or even looking up the ServiceReference yourself – that’s what would happen.

What actually happens is that the DS component is instantiated in step 2 above. That’s because the open() call – which is nicely thread-safe by the way, in the way that getService() isn’t – starts looking for services, and then caches the InitialTracked service, which causes DS to instantiate the component for you. Since most DS components often have a default, no-arg constructor, this generally misses most people’s attention.

If your component’s constructor – or more importantly, the fields therein, cause many classes to be loaded or perform substantial work or calculation, the fact that you’re hitting a synchronized call can take some non-trivial amount of time. And since this is typically in an Activator.start() method, it means that your nicely delay-until-its-needed component is now on the critical path of this bundle’s start-up, despite not actually needing the service right now.

This is one of the main problems in Eclipse’s start-up; many, many thousands of classes are loaded too eagerly. I’ve been working over the years to try and reduce the problem but it’s an uphill struggle and bad patterns (particularly the use of Activator) are endemic in a non-trivial subset of the Eclipse ecosystem. Of course, there are many fine and historical reasons why this is the case, not the least of which is that we didn’t start shipping DS in the Eclipse runtime until fairly recently.

Repo repro

Of course, when you point this out, not everyone is aware of this subtle behaviour. And while opinions may differ, code does not. I have put together a sample project which has two bundles:

  • Client, which has an Activator (yeah I know, I’m using it to make a point) that uses a ServiceTracker to look for Runnable instances
  • Runner, which has a DS component that provides a Runnable interface

When launched together, as soon as the method is called, you can see the console printing "Component has been instantiated" message. This is despite the Client bundle never actually using the service that the ServiceTracker causes to be obtained.

If you run it with the system property -DdisableOpen=true, the statement is not called, and the component is not instantiated.

This is a non-trivial reason as to why Eclipse startup can be slow. There are many, many uses of ServiceTracker to reach out to other parts of the system, and regardless of whether these are lazy DS components or have been actively instantiated, the use of causes them to all be eagerly activated, even before they’re needed. We can migrate Eclipse’s services to DS (and in fact, I’m working on doing just that) but until we eliminate the ServiceTracker from various Activators, we won’t see the benefit.

The code in the github repository essentially boils down to:

public void start(BundleContext bundleContext) throws Exception {
serviceTracker = new ServiceTracker<>(bundleContext, Runnable.class, null);
if (!Boolean.getBoolean("disableOpen")) {; // This will cause a DS component to be instantiated even though we don't use it

Unfortunately, there’s no way to use ServiceTracker to listen to lazily activated services, and as an OSGi standard, the behaviour is baked in to it.

Fortunately, there’s a lighter-weight tracker you can use called ServiceCaller – but that’s a topic for another blog post.


Using will cause lazily instantiated DS components to be activated eagerly, before the service is used. Instead of using ServiceTracker, try moving your service out to a DS component, and then DS will do the right thing.

July 02, 2020 08:00 PM

How to install RDi in the latest version of Eclipse

by Wim at June 30, 2020 03:57 PM

Monday, June 29, 2020
In this blog, I am going to show you how to install IBM RDi into the latest and the greatest version of Eclipse. If you prefer to watch a video then scroll down to the end. **EDIT** DOES NOT WORK WITH ECLIPSE 2020/09 AND HIGHER.

Read more

by Wim at June 30, 2020 03:57 PM

Quarkus – Supersonic Subatomic IoT

by Jens Reimann at June 30, 2020 03:22 PM

Quarkus is advertised as a “Kubernetes Native Java stack, …”, so we took it to a test, and checked what benefits we can get, by replacing an existing service from the IoT components of EnMasse, the cloud-native, self-service messaging system.

The context

For quite a while, I wanted to try out Quarkus. I wanted to see what benefits it brings us in the context of EnMasse. The IoT functionality of EnMasse is provided by Eclipse Honoâ„¢, which is a micro-service based IoT connectivity platform. Hono is written in Java, makes heavy use of Vert.x, and the application startup and configuration is being orchestrated by Spring Boot.

EnMasse provides the scalable messaging back-end, based on AMQP 1.0. It also takes care of the Eclipse Hono deployment, alongside EnMasse. Wiring up the different services, based on an infrastructure custom resource. In a nutshell, you create a snippet of YAML, and EnMasse takes care and deploys a messaging system for you, with first-class support for IoT.

Architecture diagram, explaining the tenant service.
Architectural overview – showing the Tenant Service

This system requires a service called the “tenant service”. That service is responsible for looking up an IoT tenant, whenever the system needs to validate that a tenant exists or when its configuration is required. Like all the other services in Hono, this service is implemented using the default stack, based on Java, Vert.x, and Spring Boot. Most of the implementation is based on Vert.x alone, using its reactive and asynchronous programming model. Spring Boot is only used for wiring up the application, using dependency injection and configuration management. So this isn’t a typical Spring Boot application, it is neither using Spring Web or any of the Spring Messaging components. And the reason for choosing Vert.x over Spring in the past was performance. Vert.x provides an excellent performance, which we tested a while back in our IoT scale test with Hono.

The goal

The goal was simple: make it use fewer resources, having the same functionality. We didn’t want to re-implement the whole service from scratch. And while the tenant service is specific to EnMasse, it still uses quite a lot of the base functionality coming from Hono. And we wanted to re-use all of that, as we did with Spring Boot. So this wasn’t one of those nice “greenfield” projects, where you can start from scratch, with a nice and clean “Hello World”. This is code is embedded in two bigger projects, passes system tests, and has a history of its own.

So, change as little as possible and get out as much as we can. What else could it be?! And just to understand from where we started, here is a screenshot of the metrics of the tenant service instance on my test cluster:

Screenshot of original resource consumption.
Metrics for the original Spring Boot application

Around 200MiB of RAM, a little bit of CPU, and not much to do. As mentioned before, the tenant service only gets queries to verify the existence of a tenant, and the system will cache this information for a bit.

Step #1 – Migrate to Quarkus

To use Quarkus, we started to tweak our existing project, to adopt the different APIs that Quarkus uses for dependency injection and configuration. And to be fair, that mostly meant saying good-bye to Spring Boot specific APIs, going for something more open. Dependency Injection in Quarkus comes in the form of CDI. And Quarkus’ configuration is based on Eclipse MicroProfile Config. In a way, we didn’t migrate to Quarkus, but away from Spring Boot specific APIs.

First steps

Starting with adding the Quarkus Maven plugin and some basic dependencies to our Maven build, and off we go.

And while replacing dependency inject was a rather smooth process, the configuration part was a bit more tricky. Both Hono and Microprofile Config have a rather opinionated view on the configuration. Which made it problematic to enhance the Hono configuration in the way that Microprofile was happy. So for the first iteration, we ended up wrapping the Hono configuration classes to make them play nice with Microprofile. However, this is something that we intend to improve in Hono in the future.

Packaging the JAR into a container was no different than with the existing version. We only had to adapt the EnMasse operator to provide application arguments in the form Quarkus expected them.

First results

From a user perspective, nothing has changed. The tenant service still works the way it is expected to work and provides all the APIs as it did before. Just running with the Quarkus runtime, and the same JVM as before:

Screenshot of resource consumption with Quarkus in JVM mode.
Metrics after the conversion to Quarkus, in JVM mode

We can directly see a drop of 50MiB from 200MiB to 150MiB of RAM, that isn’t bad. CPU isn’t really different, though. There also is a slight improvement of the startup time, from ~2.5 seconds down to ~2 seconds. But that isn’t a real game-changer, I would say. Considering that ~2.5 seconds startup time, for a Spring Boot application, is actually not too bad, other services take much longer.

Step #2 – The native image

Everyone wants to do Java “native compilation”. I guess the expectation is that native compilation makes everything go much faster. There are different tests by different people, comparing native compilation and JVM mode, and the outcomes vary a lot. I don’t think that “native images” are a silver bullet to performance issues, but still, we have been curious to give it a try and see what happens.

Native image with Quarkus

Enabling native image mode in Quarkus is trivial. You need to add a Maven profile, set a few properties and you have native image generation enabled. With setting a single property in the Maven POM file, you can also instruct the Quarkus plugin to perform the native compilation step in a container. With that, you don’t need to worry about the GraalVM installation on your local machine.

Native image generation can be tricky, we knew that. However, we didn’t expect this to be as complex as being “Step #2”. In a nutshell, creating a native image compiles your code to CPU instruction, rather than JVM bytecode. In order to do that, it traces the call graph, and it fails to do so when it comes to reflection in Java. GraalVM supports reflection, but you need to provide the information about types, classes, and methods that want to participate in the reflection system, from the outside. Luckily Quarkus provides tooling to generate this information during the build. Quarkus knows about constructs like de-serialization in Jackson and can generate the required information for GraalVM to compile this correctly.

However, the magic only works in areas that Quarkus is aware of. So we did run into some weird issues, strange behavior that was hard to track down. Things that worked in JVM mode all of a sudden were broken in native image mode. Not all the hints are in the documentation. And we also didn’t read (or understand) all of the hints that are there. It takes a bit of time to learn, and with a lot of help from some colleagues (many thanks to Georgios, Martin, and of course Dejan for all the support), we got it running.

What is the benefit?

After all the struggle, what did it give us?

Screenshot of resource consumption with Quarkus in native image mode.
Metrics when running as native image Quarkus application

So, we are down another 50MiB of RAM. Starting from ~200MiB, down to ~100MiB. That is only half the RAM! Also, this time, we see a reduction in CPU load. While in JVM mode (both Quarkus and Spring Boot), the CPU load was around 2 millicores, now the CPU is always below that, even during application startup. Startup time is down from ~2.5 seconds with Spring Boot, to ~2 seconds with Quarkus in JVM mode, to ~0.4 seconds for Quarkus in native image mode. Definitely an improvement, but still, neither of those times is really bad.

Pros and cons of Quarkus

Switching to Quarkus was no problem at all. We found a few areas in the Hono configuration classes to improve. But in the end, we can keep the original Spring Boot setup and have Quarkus at the same time. Possibly other Microprofile compatible frameworks as well, though we didn’t test that. Everything worked as before, just using less memory. And except for the configuration classes, we could pretty much keep the whole application as it was.

Native image generation was more complex than expected. However, we also saw some real benefits. And while we didn’t do any performance tests on that, here is a thought: if the service has the same performance as before, the fact that it requires only half the of memory, and half the CPU cycles, this allows us to run twice the amount of instances now. Doubling throughput, as we can scale horizontally. I am really looking forward to another scale test since we did do all other kinds of optimizations as well.

You should also consider that the process of building a native image takes quite an amount of time. For this, rather simple service, it takes around 3 minutes on an above-than-average machine, just to build the native image. I did notice some decent improvement when trying out GraalVM 20.0 over 19.3, so I would expect some more improvements on the toolchain over time. Things like hot code replacement while debugging, are things that are not possible with the native image profile though. It is a different workflow, and that may take a bit to adapt. However, you don’t need to commit to either way. You can still have both at the same time. You can work with JVM mode and the Quarkus development mode, and then enable the native image profile, whenever you are ready.

Taking a look at the size of the container images, I noticed that the native image isn’t smaller (~85 MiB), compared to the uber-JAR file (~45 MiB). Then again, our “java base” image alone is around ~435 MiB. And it only adds the JVM on top of the Fedora minimal image. As you don’t need the JVM when you have the native image, you can go directly with the Fedora minimal image, which is around ~165 MiB, and end up with a much smaller overall image.


Switching our existing Java project to Quarkus wasn’t a big deal. It required some changes, yes. But those changes also mean, using some more open APIs, governed by the Eclipse Foundation’s development process, compared to using Spring Boot specific APIs. And while you can still use Spring Boot, changing the configuration to Eclipse MicroProfile opens up other possibilities as well. Not only Quarkus.

Just by taking a quick look at the numbers, comparing the figures from Spring Boot to Quarkus with native image compilation: RAM consumption was down to 50% of the original, CPU usage also was down to at least 50% of original usage, and the container image shrank to ~50% of the original size. And as mentioned in the beginning, we have been using Vert.x for all the core processing. Users that make use of the other Spring components should see more considerable improvement.

Going forward, I hope we can bring the changes we made to the next versions of EnMasse and Eclipse Hono. There is a real benefit here, and it provides you with some awesome additional choices. And in case you don’t like to choose, the EnMasse operator has some reasonable defaults for you 😉

Also see

This work is based on the work of others. Many thanks to:

The post Quarkus – Supersonic Subatomic IoT appeared first on ctron's blog.

by Jens Reimann at June 30, 2020 03:22 PM

Updates to the Eclipse IP Due Diligence Process

by waynebeaton at June 25, 2020 07:23 PM

In October 2019, The Eclipse Foundation’s Board of Directors approved an update to the IP Policy that introduces several significant changes in our IP due diligence process. I’ve just pushed out an update to the Intellectual Property section in the Eclipse Foundation Project Handbook.

I’ll apologize in advance that the updates are still a little rough and require some refinements. Like the rest of the handbook, we continually revise and rework the content based on your feedback.

Here’s a quick summary of the most significant changes.

License certification only for third-party content. This change removes the requirement to perform deep copyright, provenance and scanning of anomalies for third-party content unless it is being modified and/or if there are special considerations regarding the content. Instead, the focus for third-party content is on license compatibility only, which had previously been referred to as Type A due diligence.

Leverage other sources of license information for third-party content. With this change to license certification only for third-party content, we are able to leverage existing sources of information license information. That is, the requirement that the Eclipse IP Team personally review every bit of third-party content has been removed and we can now leverage other trusted sources.

ClearlyDefined is a trusted source of license information. We currently have two trusted sources of license information: The Eclipse Foundation’s IPZilla and ClearlyDefined. The IPZilla database has been painstakingly built over most of the lifespan of the Eclipse Foundation; it contains a vast wealth of deeply vetted information about many versions of many third-party libraries. ClearlyDefined is an OSI project that combines automated harvesting of software repositories and curation by trusted members of the community to produce a massive database of license (and other) information about content.

Piggyback CQs are no longer required. CQs had previously been used for tracking both the vetting process and the use of third-party content. With the changes, we are no longer required track the use of third-party content using CQs, so piggyback CQs are no longer necessary.

Parallel IP is used in all cases. Previously, our so-called Parallel IP process, the means by which project teams could leverage content during development while the IP Team completed their due diligence review was available only to projects in the incubation phase and only for content with specific conditions. This is no longer the case: full vetting is now always applied in parallel in all cases.

CQs are not required for third-party content in all cases. In the case of third-party content due diligence, CQs are now only used to track the vetting process.

CQs are no longer required before third-party content is introduced. Previously, the IP Policy required that all third-party content must be vetted by the Eclipse IP Team before it can be used by an Eclipse Project. The IP Policy updates turn this around. Eclipse project teams may now introduce new third-party content during a development cycle without first checking with the IP Team. That is, a project team may commit build scripts, code references, etc. to third-party content to their source code repository without first creating a CQ to request IP Team review and approval of the third-party content. At least during the development period between releases, the onus is on the project team to—​with reasonable confidence—​ensure any third-party content that they introduce is license compatible with the project’s license. Before any content may be included in any formal release the project team must engage in the due diligence process to validate that the third-party content licenses are compatible with the project license.

History may be retained when an existing project moves to the Eclipse Foundation. We had previously required that the commit history for a project moving to the Eclipse Foundation be squashed and that the initial contribution be the very first commit in the repository. This is no longer the case; existing projects are now encouraged (but not required) to retain their commit history. The initial contribution must still be provided to the IP Team via CQ as a snapshot of the HEAD state of the existing repository (if any).

The due diligence process for project content is unchanged.

If you notice anything that looks particularly wrong or troubling, please either open a bug report, or send a note to EMO.

by waynebeaton at June 25, 2020 07:23 PM

Eclipse JustJ

by Ed Merks ( at June 25, 2020 08:18 AM

I've recently completed the initial support for provisioning the new Eclipse JustJ project, complete with a logo for it.

I've learned several new technologies and honed existing technology skills to make this happen. For example, I've previously used Inkscape to create nicer images for Oomph; a *.png with alpha is much better than a *.gif with a transparent pixel, particularly with the vogue, dark-theme fashion trend, which for old people like me feels more like the old days of CRT monitors than something modern, but hey, to each their own. In any case, a *.svg is cool, definitely looks great at every resolution, and can easily be rendered to a *.png.

By the way, did you know that artwork derivative of  Eclipse artwork requires special approval? Previously the Eclipse Board of Directors had to review and approve such logos, but now our beloved, supreme leader, Mike Milinkovich, is empowered to do that personally.

Getting to the point where we can redistribute JREs at Eclipse has been a long and winding road.  This of course required Board approval and your elected Committer Representatives helped push that to fruition last year.  Speaking of which, now there is an exciting late-breaking development: the move of AdoptOpenJDK to Eclipse Adoptium.  This will be an important source JREs for JustJ!

One of the primary goals of JustJ is to provide JREs via p2 update sites such that a product build can easily incorporate a JRE into the product. With that in place, the product runs out-of-the-box regardless of the JRE installed on the end-user's computer, which is particularly useful for products that are not Java-centric where the end-user doesn't care about the fact that Eclipse is implemented using Java.  This will also enable the Eclipse Installer to run out-of-the-box and will enable the installer to create an installation that, at the user's discretion, uses a JRE provided by Eclipse. In all cases, this includes the ability to update the installation's embedded JRE as new ones are released.

The first stage is to build a JRE from a JDK using jlink.  This must run natively on the JDK's actual supported operating system and hardware architecture.  Of course we want to automate this step, and all the steps involved in producing a p2 repository populated with JREs.  This is where I had to learn about Jenkins pipeline scripts.  I'm particularly grateful to Mikaël Barbero for helping me get started with a simple example.  Now I am a pipeline junkie, and of course I had to learn Groovy as well.

In the initial stage, we generate the JREs themselves, and that involves using shell scripts effectively.  I'm not a big fan of shell scripts, but they're a necessary evil.  I authored a single script that produces JREs on all the supported operating systems; one that I can run locally on Windows and on my two virtual boxes as well. The pipeline itself needs to run certain stages on specific agents such that their steps are performed on the appropriate operating system and hardware.  I'm grate to Robert Hilbrich of DLR for supporting JustJ's builds with their organization's resource packs!  He's also been kind enough to be one of our first test guinea pigs building a product with a JustJ JRE.  The initial stage produces a set of JREs.

In the next stage, JREs need to be wrapped into plugins and features to produce a p2 repository via a Maven/Tycho build.  This is a huge amount of boiler plate scaffolding that is error-prone to author and challenging to maintain, especially when providing multiple JRE flavors.  So of course we want to automate the generation of this scaffolding as well.  Naturally if we're going to generate something, we need a model to capture the boiled-down essence of what needs to be generated.  So I whipped together an EMF model and used JET templates to sketch out the scaffolding. With the super cool JET Editor, these are really easy to author and maintain.  This stage is described in the documentation and produces a p2 update site.  The sites are automatically maintained and the index pages are automatically generated.

To author nice documentation I had to learn PHP much better.  It's really quite cool and very powerful, particularly for producing pages with dynamic content.  For example, I used it to implement more flexible browsing support of so that one can really see all the files present, even when there is an index.html or index.php in the folder.  In any case, there is now lots of documentation for JustJ to describe everything in detail, and it was authored with the help of PHP scaffolding.

Last but not least, there is an Oomph setup to automate the provisioning of a full development environment along with a tutorial to describe in detail everything in that workspace.  There's no excuse not to contribute.  While authoring this tutorial, I found that creating nice, appropriately-clipped screen captures is super annoying and very time consuming, so I dropped a little goodie into Oomph to make that easier.   You might want to try it. Just add "-Dorg.eclipse.oomph.ui.screenshot=<some-folder-location>" to your eclipse.ini to enable it.  Then, if you hit Ctrl twice quickly, screen captures will be produced immediately based on where your application currently has focus.  If you hit Shift twice quickly, screen captures will be produced after a short delay.  This allows you to bring up a menu from the menu bar, from a toolbar button, or a context menu, and capture that menu.  In all cases, the captures include the "simulated" mouse cursor and starts with the "focus", expanding outward to the full enclosing window.

The bottom line, JustJ generates everything given just a set of URLs to JDKs as input, and it maintains everything automatically.  It even provides an example of how to build a product with an embedded JRE to get you started quickly.  And thanks to some test guinea pigs, we know it really works as advertised.

On the personal front, during this time period, I finished my move to Switzerland.  Getting up early here is a feast for the eyes! The movers were scurrying around my apartment the same days as the 2020-06 release, which was also the same day as one of the Eclipse Board meetings.  That was a little too much to juggle at once!

At this point, I can make anything work and I can make anything that already works work even better. Need help with something?  I'm easy to find...

by Ed Merks ( at June 25, 2020 08:18 AM

WTP 3.18 Released!

June 17, 2020 11:55 PM

The Eclipse Web Tools Platform 3.18 has been released! Installation and updates can be performed using the Eclipse IDE 2020-06 Update Site or through the Eclipse Marketplace . Release 3.18 is included in the 2020-06 Eclipse IDE for Enterprise Java Developers , with selected portions also included in several other packages . Adopters can download the R3.18.0 p2 repository directly and combine it with the necessary dependencies.

More news

June 17, 2020 11:55 PM

Clean Sheet Service Update (0.8)

by Frank Appel at May 23, 2020 09:25 AM

Written by Frank Appel

Thanks to a community contribution we’re able to announce another Clean Sheet Service Update (0.8).

The Clean Sheet Eclipse Design

In case you've missed out on the topic and you are wondering what I'm talking about, here is a screenshot of my real world setup using the Clean Sheet theme (click on the image to enlarge). Eclipse IDE Look and Feel: Clean Sheet Screenshot For more information please refer to the features landing page at, read the introductory Clean Sheet feature description blog post, and check out the New & Noteworthy page.


Clean Sheet Service Update (0.8)

This service update fixes a rendering issue of ruler numbers. Kudos to Pierre-Yves B. for contributing the necessary fixes. Please refer to the issue #87 for more details.

Clean Sheet Installation

Drag the 'Install' link below to your running Eclipse instance

Drag to your running Eclipse* workspace. *Requires Eclipse Marketplace Client


Select Help > Install New Software.../Check for Updates.
P2 repository software site: @
Feature: Code Affine Theme

After feature installation and workbench restart select the ‘Clean Sheet’ theme:
Preferences: General > Appearance > Theme: Clean Sheet


On a Final Note, …

Of course, it’s interesting to hear suggestions or find out about potential issues that need to be resolved. Feel free to use the Xiliary Issue Tracker or the comment section below for reporting.

I’d like to thank all the Clean Sheet adopters for the support! Have fun with the latest update :-)

The post Clean Sheet Service Update (0.8) appeared first on Code Affine.

by Frank Appel at May 23, 2020 09:25 AM

Clean Sheet Service Update (0.7)

by Frank Appel at April 24, 2020 08:49 AM

Written by Frank Appel

It’s been a while, but today we’re happy to announce a Clean Sheet Service Update (0.7).

The Clean Sheet Eclipse Design

In case you've missed out on the topic and you are wondering what I'm talking about, here is a screenshot of my real world setup using the Clean Sheet theme (click on the image to enlarge). Eclipse IDE Look and Feel: Clean Sheet Screenshot For more information please refer to the features landing page at, read the introductory Clean Sheet feature description blog post, and check out the New & Noteworthy page.


Clean Sheet Service Update (0.7)

This service update provides the long overdue JRE 11 compatibility on windows platforms. Kudos to Pierre-Yves B. for contributing the necessary fixes. Please refer to the issues #88 and #90 for more details.

Clean Sheet Installation

Drag the 'Install' link below to your running Eclipse instance

Drag to your running Eclipse* workspace. *Requires Eclipse Marketplace Client


Select Help > Install New Software.../Check for Updates.
P2 repository software site: @
Feature: Code Affine Theme

After feature installation and workbench restart select the ‘Clean Sheet’ theme:
Preferences: General > Appearance > Theme: Clean Sheet


On a Final Note, …

Of course, it’s interesting to hear suggestions or find out about potential issues that need to be resolved. Feel free to use the Xiliary Issue Tracker or the comment section below for reporting.

I’d like to thank all the Clean Sheet adopters for the support! Have fun with the latest update :-)

The post Clean Sheet Service Update (0.7) appeared first on Code Affine.

by Frank Appel at April 24, 2020 08:49 AM

Using the remote OSGi console with Equinox

by Mat Booth at April 23, 2020 02:00 PM

You may be familiar with the OSGi shell you get when you pass the "-console" option to Equinox on the command line. Did you know you can also use this console over Telnet sessions or SSH sessions? This article shows you the bare minimum needed to do so.

by Mat Booth at April 23, 2020 02:00 PM

EclipseCon 2020 CFP is Open

April 16, 2020 08:30 PM

If you are interested in speaking, our call for proposals is now open. Please visit the CFP page for information on how to submit your talk.

April 16, 2020 08:30 PM

Add Your Voice to the 2020 Jakarta EE Developer Survey

April 07, 2020 01:00 PM

Our third annual Jakarta EE Developer Survey is now open and I encourage everyone to take a few minutes and complete the survey before the April 30 deadline.

April 07, 2020 01:00 PM

Eclipse IoT Website Redesign

March 24, 2020 02:12 PM

The Eclipse IoT website redesign is now live! This project was a huge undertaking for us; we added 5,245 lines of code, closed 15 issues, removed 82,361 lines of code and made 84 commits.

Eclipse IoT Homepage

Yes, you got that right, the end result was -77,116 lines of code because we took the opportunity to clean up our codebase.

To kickoff this initiative, the community help us define the goals for this project:

  1. Improve our information architecture:
    Led by Frédéric Desbiens, the Eclipse IoT community created a new structure for the website.
  2. Contribute to the recruitment of new members and adopters:
    Adopters and Members are now top-level menu items. We also created a new “How to be Listed as an Adopter” page.
  3. Ensure the website cathers to both technical and non-technical visitors:
    We made some big improvements to our Community and Resources sections. These sections cathers to both technical and non-technical users since you can find Case-Studies, Market Reports, Videos, White Papers and some additional information on how you can stay informed about what’s currently going on with Eclipse IoT.
  4. Drive adoption for our technologies:
    We now fetch project information from the Eclipse PMI each time we push a change to the website. Our stale project page is now a thing of the past!

In an effort to communicate our project plans with our community, we created a public GitHub project with two milestones.

Being open and transparent allows us to natually inform our communities about our efforts and we think it’s a great way for us to collaborate and share tasks. As the project manager, this workflow allows me to ensure that the project is moving forward as planned.

We also created a set of brand guidelines for the Eclipse IoT Working Group. These guidelines include the brand font (Roboto), logo variations, color swatches, and acceptable logo treatments. This will help us consistently deploy the brand across different digital and print channels as well as Eclipse IoT events.

Overall, I am very happy with this new redesign! A huge thank you to Eric Poirier, Matt Joanisse, a graphic designer hired by the Foundation to work on the site, Christie Witt, Joe Speed, Frédéric Desbiens and Martin Lowe!

March 24, 2020 02:12 PM

Eclipse Oomph: Suppress Welcome Page

by kthoms at March 19, 2020 04:37 PM

I am frequently spawning Eclipse workspaces with Oomph setups and the first action I do when a new workspace is provisioned is to close Eclipse’s welcome page. So I wanted to suppress that for a current project setup. So I started searching where Eclipse stores the preference that disables the intro page. The location of that preference is within the workspace directory at


The content of the preference file is


So to make Oomph create the preference file before the workspace is started the first time use a Resource Creation task and set the Target URL


Then put the above mentioned preference content as Content value.

by kthoms at March 19, 2020 04:37 PM

MPS’ Quest of the Holy GraalVM of Interpreters

by Niko Stotz at March 11, 2020 11:19 PM

A vision how to combine MPS and GraalVM

Way too long ago, I prototyped a way to use GraalVM and Truffle inside JetBrains MPS. I hope to pick up this work soon. In this article, I describe the grand picture of what might be possible with this combination.

Part I: Get it Working

Step 0: Teach Annotation Processors to MPS

Truffle uses Java Annotation Processors heavily. Unfortunately, MPS doesn’t support them during its internal Java compilation. The feature request doesn’t show any activity.

So, we have to do it ourselves. A little less time ago, I started with an alternative Java Facet to include Annotation Processors. I just pushed my work-in-progress state from 2018. As far as I remember, there were no fundamental problems with the approach.

Optional Step 1: Teach Truffle Structured Sources

For Truffle, all executed programs stem from a Source. However, this Source can only provide Bytes or Characters. In our case, we want to provide the input model. The prototype just put the Node id of the input model as a String into the Source; later steps resolved the id against MPS API. This approach works and is acceptable; directly passing the input node as object would be much nicer.

Step 2: Implement Truffle Annotations as MPS Language

We have to provide all additional hints as Annotations to Truffle. They are complex enough, so we want to leverage MPS’ language features to directly represent all Truffle concepts.

This might be a simple one-to-one representation of Java Annotations as MPS Concepts, but I’d guess we can add some more semantics and checks. Such feedback within MPS should simplify the next steps: Annotation Processors (and thus, Truffle) have only limited options to report issues back to us.

We use this MPS language to implement the interpreter for our DSL. This results in a TruffleLanguage for our DSL.

Step 3: Start Truffle within MPS

At the time when I wrote the proof-of-concept, a TruffleLanguage had to be loaded at JVM startup. To my understanding, Truffle overcame this limitation. I haven’t looked into the current possibilities in detail yet.

I can imagine two ways to provide our DSL interpreter to the Truffle runtime:

  1. Always register MpsTruffleLanguage1, MpsTruffleLanguage2, etc. as placeholders. This would also work at JVM startup. If required, we can register additional placeholders with one JVM restart.
    All non-colliding DSL interpreters would be MpsTruffleLanguage1 from Truffle’s point of view. This works, as we know the MPS language for each input model, and can make sure Truffle uses the right evaluation for the node at hand. We might suffer a performance loss, as Truffle had to manage more evaluations.

    What are non-colliding interpreters? Assume we have a state machine DSL, an expression DSL, and a test DSL. The expression DSL is used within the state machines; we provide an interpreter for both of them.
    We provide two interpreters for the test DSL: One executes the test and checks the assertions, the other one only marks model nodes that are covered by the test.
    The state machine interpreter, the expression interpreter, and the first test interpreter are non-colliding, as they never want to execute on the same model node. All of them go to MpsTruffleLanguage1.
    The second test interpreter does collide, as it wants to do something with a node also covered by the other interpreters. We put it to MpsTruffleLanguage2.

  2. We register every DSL interpreter as a separate TruffleLanguage. Nice and clean one-to-one relation. In this scenario, we probably had to get Truffle Language Interop right. I have not yet investigated this topic.

Step 4: Translate Input Model to Truffle Nodes

A lot of Truffle’s magic stems from its AST representation. Thus, we need to translate our input model (a.k.a. DSL instance, a.k.a. program to execute) from MPS nodes into Truffle Nodes.

Ideally, the Truffle AST would dynamically adopt any changes of the input model — like hot code replacement in a debugger, except we don’t want to stop the running program. From Truffle’s point of view this shouldn’t be a problem: It rewrites the AST all the time anyway.

DclareForMPS seems a fitting technology. We define mapping rules from MPS node to Truffle Node. Dclare makes sure they are in sync, and input changes are propagated optimally. These rules could either be generic, or be generated from the interpreter definition.

We need to take care that Dclare doesn’t try to adapt the MPS nodes to Truffle’s optimizing AST changes (no back-propagation).

We require special handling for edge cases of MPS → Truffle change propagation, e.g. the user deletes the currently executed part of the program.

For memory optimization, we might translate only the entry nodes of our input model immediately. Instead of the actual child Truffle Nodes, we’d add special nodes that translate the next part of the AST.
Unloading the not required parts might be an issue. Also, on-demand processing seems to conflict with Dclare’s rule-based approach.

Part II: Adapt to MPS

Step 5: Re-create Interpreter Language

The MPS interpreter framework removes even more boilerplate from writing interpreters than Truffle. The same language concepts should be built again, as abstraction on top of the Truffle Annotation DSL. This would be a new language aspect.

Step 6: Migrate MPS Interpreter Framework

Once we had the Truffle-based interpreter language, we want to use it! Also, we don’t want to rewrite all our nice interpreters.

I think it’s feasible to automatically migrate at least large parts of the existing MPS interpreter framework to the new language. I would expect some manual adjustment, though. That’s the price we had to pay for two orders of magnitude performance improvement.

Step 7: Provide Plumbing for BaseLanguage, Checking Rules, Editors, and Tests

Using the interpreter should be as easy as possible. Thus, we have to provide the appropriate utilities:

  • Call the interpreter from any BaseLanguage code.
    We had to make sure we get language / model loading and dependencies right. This should be easier with Truffle than with the current interpreter, as most language dependencies are only required at interpreter build time.
  • Report interpreter results in Checking Rules.
    Creating warnings or errors based on the interpreter’s results is a standard use-case, and should be supported by dedicated language constructs.
  • Show interpreter results in an editor.
    As another standard use-case, we might want to show the interpreter’s results (or a derivative) inside an MPS editor. Especially for long-running or asynchronous calculations, getting this right is tricky. Dedicated editor extensions should take care of the details.
  • Run tests that involve the interpreter.
    Yet another standard use-case: our DSL defines both calculation rules and examples. We want to assure they are in sync, meaning executing the rules in our DSL interpreter and comparing the results with the examples. This must work both inside MPS, and in a headless build / CI test environment.

Step 8: Support Asynchronous Interpretation and/or Caching

The simple implementation of interpreter support accepts a language, parameters, and a program (a.k.a. input model), and blocks until the interpretation is complete.

This working mode is useful in various situations. However, we might want to run long-running interpretations in the background, and notify a callback once the computation is finished.

Example: An MPS editor uses an interpreter to color a rule red if it is not in accordance with a provided example. This interpretation result is very useful, even if it takes several seconds to calculate. However, we don’t want to block the editor (or even whole MPS) for that long.

Extending the example, we might also want to show an error on such a rule. The typesystem runs asynchronously anyways, so blocking is not an issue. However, we now run the same expensive interpretation twice. The interpreter support should provide configurable caching mechanisms to avoid such waste.

Both asynchronous interpretation and caching benefit from proper language extensions.

Step 9: Integrate with MPS Typesystem and Scoping

Truffle needs to know about our DSL’s types, e.g. for resolving overloaded functions or type casting. We already provide this information to the MPS typesystem. I didn’t look into the details yet; I’d expect we could generate at least part of the Truffle input from MPS’ type aspect.

Truffle requires scoping knowledge to store variables in the right stack frame (and possibly other things I don’t understand yet). I’d expect we could use the resolved references in our model as input to Truffle. I’m less optimistic to re-use MPS’ actual scoping system.

For both aspects, we can amend the missing information in the Interpreter Language, similar to the existing one.

Step 10: Support Interpreter Development

As DSL developers, we want to make sure we implemented our interpreter correctly. Thus, we write tests; they are similar to other tests involving the interpreter.

However, if they fail, we don’t want to debug the program expressed in our DSL, but our interpreter. For example, we might implement the interpreter for a switch-like construct, and had forgotten to handle an implicit default case.

Using a regular Java debugger (attached to our running MPS instance) has only limited use, as we had to debug through the highly optimized Truffle code. We cannot use Truffle’s debugging capabilities, as they work on the DSL.
There might be ways to attach a regular Java debugger running inside MPS in a different thread to its own JVM. Combining the direct debugger access with our knowledge of the interpreter’s structure, we might be able to provide sensible stepping through the interpreter to the DSL developer.

Simpler ways to support the developers might be providing traces through the interpreter, or ship test support where the DSL developer can assure specific evaluators were (not) executed.

Step 11: Create Language for Interop

Truffle provides a framework to describe any runtime in-memory data structure as Shape, and to convert them between languages. This should be a nice extension of MPS’ multi-language support into the runtime space, supported by an appropriate Meta-DSL (a.k.a. language aspect).

Part III: Leverage Programming Language Tooling

Step 12: Connect Truffle to MPS’ Debugger

MPS contains the standard interactive debugger inherited from IntelliJ platform.

Truffle exposes a standard interface for interactive debuggers of the interpreted input. It takes care of the heavy lifting from Truffle AST to MPS input node.

If we ran Truffle in a different thread than the MPS debugger, we should manage to connect both parts.

Step 13: Integrate Instrumentation

Truffle also exposes an instrumentation interface. We could provide standard instrumentation applications like “code” coverage (in our case: DSL node coverage) and tracing out-of-the-box.

One might think of nice visualizations:

  • Color node background based on coverage
  • Mark the currently executed part of the model
  • Project runtime values inline
  • Show traces in trace explorer

Other possible applications:

  • Snapshot mechanism for current interpreter state
  • Provide traces for offline debugging, and play them back

Part IV: Beyond MPS

Step 14: Serialize Truffle Nodes

If we could serialize Truffle Nodes (before any run-time optimization), we would have an MPS-independent representation of the executable DSL. Depending on the serialization format (implement Serializable, custom binary format, JSON, etc.), we could optimize for use-case, size, loading time, or other priorities.

Step 15: Execute DSL stand-alone without Generator

Assume an insurance calculation DSL.
Usually, we would implement

  • an interpreter to execute test cases within MPS,
  • a Generator to C to execute on the production server,
  • and a Generator to Java to provide an preview for the insurance agent.

With serialized Truffle Nodes, we need only one interpreter:

Part V: Crazy Ideas

Step 16: Step Back Debugger

By combining Instrumentation and debugger, it might be feasible to provide step-back debugging.

In the interpreter, we know the complete global state of the program, and can store deltas (to reduce memory usage). For quite some DSLs, this might be sufficient to store every intermediate state and thus arbitrary debug movement.

Step 17: Side Step Debugger

By stepping back through our execution and following different execution paths, we could explore alternate outcomes. The different execution path might stem from other input values, or hot code replacement.

Step 18: Explorative Simulations

If we had a side step debugger, nice support to project interpretation results, and a really fast interpreter, we could run explorative simulations on lots of different executions paths. This might enable legendary interactive development.

by Niko Stotz at March 11, 2020 11:19 PM

Postmortem - February 7 storage and authentication outage

by Denis Roy at February 20, 2020 04:12 PM

On Friday, February 7 2020, suffered a severe service disruption to many of its web properties when our primary authentication server and file server suffered a hardware failure.

For 90 minutes, our main website,, was mostly available, as was our Bugzilla bug tracking tool, but logging in was not possible. Wiki, Eclipse Marketplace and other web properties were degraded. Git and Gerrit were both completely offline for 2 hours and 18 minutes. Authenticated access to Jiro -- our Jenkins+Kubernetes-based CI system, was not possible, and builds that relied on Git access failed during that time.

There was no data loss, but there were data inconsistencies. A dozen Git repositories and Gerrit code changes were in an inconsistent state due to replication schedules, but thanks to the distributed nature of Git, the code commits were still in local developer Git repositories, as well as on the failed server, which we were eventually able to revive (in an offline environment). Data inconsistencies were more severe in our LDAP accounts database, where dozens of users were unable to log in, and in some isolated cases, users reported that their account was reverted back to old data from years prior.

In hindsight, we feel this outage could have, and should have been avoided. We’ve identified many measures we must enact to prevent such unplanned outages in the future. Furthermore, our communication and incident handling processes proved to be flawed, and will be scrutinized and improved, to ensure our community is better informed during unplanned incidents.

Lastly, we’ve identified aging hardware and Single Points of Failure (SPoF) that must be addressed.


File server & authentication setup

At the center of the Eclipse infra is a pair of servers that handle 2 specific tasks:

  • Network Attached Storage (NAS) via NFS

  • User Authentication via OpenLDAP

The server pair consists of a primary system, which handles all the traffic, and a hot spare. Both servers are configured identically for production service, but the spare server sits idly and receives data periodically from the primary. This specific architecture was originally implemented in 2005, with periodical hardware upgrades over time.


Timeline of events

Friday Feb 7 - 12:33pm EST: Fred Gurr (Eclipse Foundation IT/Releng team) reports on the Foundation’s internal Slack channel that something is happening to the Infra. Denis observes many “Flaky” status reports on but is in transit and cannot investigate further. Webmaster Matt Ward investigates.

12:43pm: Matt confirms that our primary nfs/ldap server is not responding, and activates “Plan A: assess and fix”.

12:59pm: Denis reaches a computer and activates “Plan B: prepare for Failover” while Matt works on Plan A. The “Sorry, we are down” page is served for all Flaky services except, which continues to be served successfully by our nginx cache.

1:18pm: The standby server is ready to assume the “primary” role.

1:29pm: Matt makes the call for failover, as the severity of the hardware failure is not known, and not easily recoverable.

1:49pm:, Bugzilla, Marketplace, Wiki return to stable service on the new primary.

2:18pm: Git and Gerrit return to stable service.

2:42pm: Our Kubernetes/OpenShift cluster is updated to the latest patchlevel and all CI services restarted.

4:47pm: All legacy JIPP servers are restarted, and all other remaining services report functional.  At this time, we are not aware of any issues.

During the weekend, Matt continues to monitor the infra. Authentication issues crop up over the weekend, which are caused by duplicated accounts and are fixed by Matt.

Monday, 4:49am EST: Mikaël Barbero (Eclipse Foundation IT/Releng team) reports that there are more duplicate users in LDAP that cannot log into our systems. This is now a substantial issue. They are fixed systematically with an LDAP duplicate finder, but the process is very slow.

10:37am: First Foundation broadcast on the cross-project mailing list that there is an issue with authentication.

Tuesday, 9:51am: Denis blogs about the incident and posts a message to the mailing list about the ongoing authentication issues. The message, however, is held for moderation and is not distributed until many hours later.

Later that day: Most duplicated accounts have been removed, and just about everything is stabilized. We do not yet understand the source of the duplicates.

Wednesday: duplicate removals continue, as well as investigation into the cause.

Thursday 9:52am: We file a dozen bugs against projects whose Git and Gerrit repos may be out of sync. Some projects had already re-pushed or rebased their missing code patches and resolved the issue as FIXED.

Friday, 2:58pm: All remaining duplicates are removed. Our LDAP database is fully cleaned. The failed server re-enters production as the hot standby - even though its hardware is not reliable. New hardware is sourced and ordered.


Hardware failure

The physical servers assuming our NAS/LDAP setup are server-class hardware, 2U chassis with redundant power supplies, ECC (error checking and correction) memory, RAID-5 disk arrays with a battery-backup RAID controller memory. Both primary and standby servers were put into production in 2011.

On February 7, the primary server experienced a kernel crash from the RAID controller module. The RAID controller detected an unrecoverable ECC memory error. The entire server became unresponsive.

As originally designed in 2005, periodical (batched) data updates from the primary to the hot spare were simple to set up and maintain. This method also had a distinct advantage over live replication: rapid recovery in case of erasure (accidental or malicious) or data tampering. Of course, this came at a cost of possible data loss. However, it was deemed that critical data (in our case, Source Code) susceptible to loss during the short time was also available on developer workstations.

Failover and return to stability

As the standby server was prepared for production service, the reasons for the crash on the primary server were investigated. We assessed the possibility of continuing service on the primary; that course of action would have provided the fastest recovery with the fewest surprises later on.

As the nature of the hardware failure remained unknown, failover was the only option. We confirmed that some data replication tasks had run less than one hour prior to failure, and all data replication was completed no later than 3 hours prior. IP addresses were updated, and one by one, services that depended on NFS and authentication were restarted to flush caches and minimize any potential for an inconsistent state.

At about 4:30pm, or four hours after the failure, both webmasters were confident that the failover was successful, and that very little dust would settle over the weekend.

Authentication issues

Throughout the weekend, we had a few reports of authentication issues -- which were expected, since we failed over to a standby authentication source that was at least 12 hours behind the primary. These issues were fixed as they were reported, and nothing seemed out of place.

On Monday morning, Feb 10th, the Foundation’s Releng team reported that several committers had authentication issues to the CI systems. We then suspected that something else was at play with our authentication database, but it was not clear to us what had happened, or what the magnitude was. The common issue was duplicate accounts -- some users had an account in two separate containers simultaneously, which prevented users from being able to authenticate. These duplicates were removed as rapidly as we could, and we wrote scripts to identify old duplicates and purge them -- but with >450,000 accounts, it was time-consuming.

At that time, we got so wrapped up in trying to understand and resolve the issue that we completely underestimated its impact on the community, and we were absolutely silent about it.


Problem solved

On Friday afternoon, February 14, we were able to finally clean up all the duplicate accounts and understand why they existed in the first place.

Prior to December, 2011, our LDAP database only contained committer accounts. In December 2011, we imported all the non-committer accounts from Bugzilla and Wiki into an LDAP container we named “Community”. This allowed us to centralize authentication around a single source of truth: LDAP.

All new accounts were, and are created in the Community container, and are moved into the Committer container if/when they became an Eclipse Committer.

Our primary->secondary LDAP sync mechanism was altered, at that time, to sync the Community container as well -- but it was purely additive. Once you had an account in Community, it was there for life on the standby server, even if you became a committer later on. Or if you’d ever change your email address. This was the source of the duplicate accounts on the standby server.

A new server pair has been ordered on February 14, 2020 . These servers will be put into production service as soon as possible, and the old hardware will be recommissioned to clustered service. With these new machines, we believe our existing architecture and configuration can continue to serve us well over the coming months and years.


Take-aways and proposed improvements

Although the outage didn’t last incredibly long (2 hours from failure to the beginning of restored service), we feel it shouldn’t have occurred in the first place. Furthermore, we’ve identified key areas where our processes can be improved - notably, in how we communicate with you.

Here are the action items we’re committed to implementing in the near term, to improve our handling of such incidents:

  • Communication: Improved Service Status page. gives a picture of what’s going on, but with an improved service, we can communicate the nature of outages, the impact, and estimated time until service is restored.

  • Communication: Internally, we will improve communication within our team and establish a maintenance log, whereby members of the team can discover the work that has been done.

  • Staffing: we will explore the possibility of an additional IT hire, thus enhancing our collective skillset, and enabling more overall time on the quality and reliability of the infra.

  • Aging Hardware: we will put top-priority on resolving aging SPoF, and be more strict about not running hardware devices past their reasonable life expectancy.

    • In the longer term, we will continue our investment in replacing SPoF with more robust technologies. This applies to authentication, storage, databases and networking.

  • Process and procedures: we will allocate more time to testing our disaster recovery and business continuity procedures. Such tests would likely have revealed the LDAP sync bug.

We believe that these steps will significantly reduce unplanned outages such as the one that occured on February 7. They will also help us ensure that, should a failure occur, we recover and return to a state of stability more rapidly. Finally, they will help you understand what is happening, and what the timelines to restore service are, so that you can plan your work tasks and remain productive.

by Denis Roy at February 20, 2020 04:12 PM

Anatomy of a server failure

by Denis Roy at February 11, 2020 02:51 PM

Last Friday, Feb 7 at around 12:30pm (Ottawa time), I received a notification from Fred Gurr (part of our release engineering team) that something was going on with the infra. The multitude of colours on the Eclipse Service Status page confirmed it -- many of our services and tools were either slow, or unresponsive.

After some initial digging, we discovered that the primary backend file server (housing Git, Gerrit, web session data, and a lot of files for our various web properties) was not responding. It was also host to our accounts database -- the center for all user authentication.

Jumping into action

It's a well-rehearsed routine for colleage Matt Ward and I -- he worked on assessing the problem and identifying the fix, while I worked on Plan B - failover to our hot standby. At around 1:35pm, roughly 1 hour into the outage, Matt made the call -- failover is the only option, as a  hardware component has failed. 20 minutes later, most services had either recovered or were well on their way.

But the failover is not perfect. Data is sync'ed every 2 hours. Account and authentication info is replicated nightly. This was a by-design strategy decision, as it offers us a recovery window in case of data erasure, corruption or unauthenticated access.

Lessons learned

The failed server was put in service in 2011, celebrating its *gasp* ninth year of 24/7 service. That is a few years too many, and although it (and its standby counterpart) were slated for replacement in 2017, the effort was pushed back to make room for competing priorities. In a moment of bitter irony, the failed hardware was planned to be replaced in the second quarter of this year -- mere months away. We gambled with the house, we lost.

Cleaning up

Today, there is much dust to settle. Our authentication database has some gremlins that we need to fix, and there could be a few missing commits that were not replicated.

We also need to source replacement hardware for the failed component, so that we can re-enable our hot standby. At the same time, we need to immediately source replacement servers for those 2011 dinosaurs. They've served us well, but their retirement is long overdue.

by Denis Roy at February 11, 2020 02:51 PM

Interfacing null-safe code with legacy code

by Stephan Herrmann at February 06, 2020 07:38 PM

When you adopt null annotations like these, your ultimate hope is that the compiler will tell you about every possible NullPointerException (NPE) in your program (except for tricks like reflection or bytecode weaving etc.). Hallelujah.

Unfortunately, most of us use libraries which don’t have the blessing of annotation based null analysis, simply because those are not annotated appropriately (neither in source nor using external annotations). Let’s for now call such code: “legacy”.

In this post I will walk through the options to warn you about the risks incurred by legacy code. The general theme will be:

Can we assert that no NPE will happen in null-checked code?

I.e., if your code consistently uses null annotations, and has passed analysis without warnings, can we be sure that NPEs can only ever be thrown in the legacy part of the code? (NPEs inside legacy code are still to be expected, there’s nothing we can change about that).

Using existing Eclipse versions, one category of problems would still go undetected whereby null-checked code could still throw NPE. This has been recently fixed bug.

Simple data flows

Let’s start with simple data flows, e.g., when your program obtains a value from legacy code, like this:


You shouldn’t be surprised, the javadoc even says: “The method returns null if the property is not found.” While the compiler doesn’t read javadoc, it can recognize that a value with unspecified nullness flows into a variable with a non-null type. Hence the warning:

Null type safety (type annotations): The expression of type ‘String’ needs unchecked conversion to conform to ‘@NonNull String’

As we can see, the compiler warned us, so we are urged to fix the problem in our code. Conversely, if we pass any value into a legacy API, all bad that can happen would happen inside legacy code, so nothing to be done for our mentioned goal.

The underlying rule is: legacy values can be safely assigned to nullable variables, but not to non-null variables (example Properties.getProperty()). On the other hand, any value can be assigned to a legacy variable (or method argument).

Put differently: values flowing from null-checked to legacy pose no problems, whereas values flowing the opposite direction must be assumed to be nullable, to avoid problems in null-checked code.

Enter generics

Here be dragons.

As a minimum requirement we now need null annotations with target TYPE_USE (“type annotations”), but we have this since 2014. Good.


Here we obtain a List<String> value from a Legacy class, where indeed the list names is non-null (as can be seen by successful output from names.size()). Still things are going south in our code, because the list contained an unexpected null element.

To protect us from this problem, I marked the entire class as @NonNullByDefault, which causes the type of the variable names to become List<@NonNull String>. Now the compiler can again warn us about an unsafe assignment:

Null type safety (type annotations): The expression of type ‘List<String>’ needs unchecked conversion to conform to ‘List<@NonNull String>’

This captures the situation, where a null value is passed from legacy to null-checked code, which is wrapped in a non-null container value (the list).

Here’s a tricky question:

Is it safe to pass a null-checked value of a parameterized type into legacy code?

In the case of simple values, we saw no problem, but the following example tells us otherwise once generics are involved:

Again we have a list of type List<@NonNull String>, so dereferencing values obtained from that list should never throw NPE. Unfortunately, the legacy method printNames() succeeded to break our contract by inserting null into the list, resulting in yet another NPE thrown in null-checked code.

To describe this situation it helps to draw boundaries not only between null-checked and legacy code, but also to draw a boundary around the null-checked value of parameterized type List<@NonNull String>. That boundary is breached when we pass this value into legacy code, because that code will only see List<String> and happily invoke add(null).

This is were I recently invented a new diagnostic message:

Unsafe null type conversion (type annotations): The value of type ‘List<@NonNull String>’ is made accessible using the less-annotated type ‘List<String>’

By passing names into legacy code, we enable a hidden data flow in the opposite direction. In the general case, this introduces the risk of NPE in otherwise null-checked code. Always?


Java would be a much simpler language without wildcards, but a closer look reveals that wildcards actually don’t only help for type safety but also for null-safety. How so?

If the legacy method were written using a wildcard, it would not be (easily) possible to sneak in a null value, here are two attempts:

The first attempt is an outright Java type error. The second triggers a warning from Eclipse, despite the lack of null annotations:

Null type mismatch (type annotations): ‘null’ is not compatible to the free type variable ‘?’

Of course, compiling the legacy class without null-checking would still bypass our detection, but chances are already better.

If we add an upper bound to the wildcard, like in List<? extends CharSequence>, not much is changed. A lower bound, however, is an invitation for the legacy code to insert null at whim: List<? super String> will cause names.add() to accept any String, including the null value. That’s why Eclipse will also complain against lower bounded wildcards:

Unsafe null type conversion (type annotations): The value of type ‘List<@NonNull String>’ is made accessible using the less-annotated type ‘List<? super String>’

Comparing to raw types

It has been suggested to treat legacy (not null-annotated) types like raw types. Both are types with a part of the contract ignored, thereby causing risks for parts of the program that still rely on the contract.

Interestingly, raw types are more permissive in the parameterized-to-raw conversion. We are generally not protected against legacy code inserting an Integer into a List<String> when passed as a raw List.

More interestingly, using a raw type as a type argument produces an outright Java type error, so my final attempt at hacking the type system failed:



We have seen several kinds of data flow with different risks:

  • Simple values flowing checked-to-legacy don’t cause any specific headache
  • Simple values flowing legacy-to-checked should be treated as nullable to avoid bad surprises. This is checked.
  • Values of parameterized type flowing legacy-to-checked must be handled with care at the receiving side. This is checked.
  • Values of parameterized type flowing checked-to-legacy add more risks, depending on:
    • nullness of the type argument (@Nullable type argument has no risk)
    • presence of wildcards, unbounded or lower-bounded.

Eclipse can detect all mentioned situations that would cause NPE to be thrown from null-checked code – the capstone to be released with Eclipse 2020-03, i.e., coming soon …

by Stephan Herrmann at February 06, 2020 07:38 PM

Eclipse and Handling Content Types on Linux

by Mat Booth at February 06, 2020 03:00 PM

Getting deep desktop integration on Linux.

by Mat Booth at February 06, 2020 03:00 PM

JDT without Eclipse

January 16, 2020 11:00 PM

The JDT (Java Development Tools) is an important part of Eclipse IDE but it can also be used without Eclipse.

For example the Spring Tools 4, which is nowadays a cross-platform tool (Visual Studio Code, Eclipse IDE, …), is highly using the JDT behind the scene. If you would like to know more, I recommend you this podcast episode: Spring Tools lead Martin Lippert

A second known example is the Java Formatter that is also part of the JDT. Since a long time there are maven and gradle plugins that performs the same formatting as Eclipse IDE but as part of the build (often with the possibly to break the build when the code is wrongly formatted).

Reusing the JDT has been made easier since 2017 when it was decided to publish each release and its dependencies on maven central (with following groupId: org.eclipse.jdt, org.eclipse.platform). Stephan Herrmann did a lot of work to achieve this goal. I blogged about this: Use the Eclipse Java Development Tools in a Java SE application and I have pushed a simple example the Java Formatter is used in a simple main(String[]) method built by a classic minimal Maven project: java-formatter.

Workspace or not?

When using the JDT in an headless application, two cases needs to be distinguished:

  1. Some features (the parser, the formatter…) can be used in a simple Java main method.

  2. Other features (search index, AST rewriter…) require a workspace. This imply that the code run inside an OSGi runtime.

To illustrate this aspect, I took some of the examples provided by the site in the blog post series Eclipse JDT Tutorials and I adapted them so that each code snippet can be executed inside a JUnit test. This is the Programcreek examples project.

I have split the unit-tests into two projects:

  • programcreek-standalone for the one that do not require OSGi. The maven project is really simple (using the default convention everywhere)

  • programcreek-osgi for the one that must run inside an OSGi runtime. The bnd maven plugins are configured in the pom.xml to take care of the OSGi stuff.

If you run the test with Maven, it will work out-of-the box.

If you would like to run them inside an IDE, you should use one that starts OSGi when executing the tests (in the same way the maven build is doing it). To get a bnd aware IDE, you can use Eclipse IDE for Java Developers with the additional plugin Bndtools installed, but there are other possibilities.

Source code can be found on GitHub: programcreek-examples

January 16, 2020 11:00 PM

Oracle made me a Stackoverflow Guru

by Stephan Herrmann at January 16, 2020 06:40 PM

Just today Oracle helped me to become a “Guru” on Stackoverflow! How did they do it? By doing nothing.

In former times, I was periodically enraged, when Oracle didn’t pay attention to the feedback I was giving them during my work on ecj (the Eclipse Compiler for Java) – at least not the attention that I had hoped for (to be fair: there was a lot of good communication, too). At those times I had still hoped I could help make Java a language that is completely and unambiguously defined by specifications. Meanwhile I recognized that Java is at least three languages: the language defined by JLS etc., the language implemented by javac, and the language implemented by ecj (and no chance to make ecj to conform to both others). I realized that we were not done with Java 8 even 3 years after its release. Three more years later it’s still much the same.

So let’s move on, haven’t things improved in subsequent versions of Java? One of the key new rules in Java 9 is, that

“If [a qualified package name] does not name a package that is uniquely visible to the current module (§7.4.3), then a compile-time error occurs”.

Simple and unambiguous. That’s what compilers have to check.

Except: javac doesn’t check for uniqueness if one of the modules involved is the “unnamed module”.

In 2018 there was some confusion about this, and during discussion on stackoverflow I raised this issue to the jigsaw-dev mailing list. A bug was raised against javac, confirmed to be a bug by spec lead Alex Buckley. I summarized the situation in my answer on stackoverflow.

This bug could have been easily fixed in javac version 12, but wasn’t. Meanwhile upvotes on my answer on stackoverflow started coming in. The same for Java 13. The same for Java 14. And yet no visible activity on the javac bug. You need ecj to find if your program violates this rule of JLS.

Today the 40th upvote earned me the “Guru” tag on stackoverflow.

So, please Oracle, keep that bug unresolved, it will earn me a lot of reputation for a bright future – by doing: nothing 🙂

by Stephan Herrmann at January 16, 2020 06:40 PM

Building and running Equinox with maven without Tycho

January 12, 2020 11:00 PM

Eclipse Tycho is a great way to let maven build PDE based projects. But the Plug-in Development Environment (PDE) model is not the only way to work with OSGi.

In particular, since 2 or 3 years the Eclipse Platform jars (including the Equinox jars) are regularly published on Maven Central (check the artifacts having org.eclipse.platform as groupId).

I was looking for an alternative to P2 and to the target-platform mechanism.

bnd and bndtools logo

Bnd and Bndtools are always mentioned as potential alternative to PDE (I attended several talks discussing this at EclipseCon 2018: Migrating from PDE to Bndtools in Practice, From Zero to a Professional OSGi Project in Minutes). So I decided to explore this path.

This StackOverflow question catches my attention: How to start with OSGi. I had a close look at the answer provided by Peter Kriens (the founder of the Bnd and Bndtools projects), where he discusses the different possible setup:

  • Maven Only

  • Gradle Only

  • Eclipse, M2E, Maven, and Bndtools

  • Eclipse, Bndtools, Gradle

Even in the "Maven Only" or "Gradle Only" setups, the proposed solution relies on plugins using bnd under the hood.

How to start?

My project is quite simple, the dependencies are already on maven central. I will not have a complex use-case with multiple versions of the same library or with platform dependent artifacts. So fetching the dependencies with maven is sufficient.

I decided to try the "Maven Only" model.

How to start?

I was not sure to understand how to use the different bnd maven plugins: bnd-maven-plugin, bnd-indexer-maven-plugin, bnd-testing-maven-plugin, bnd-export-maven-plugin

Luckily I found the slides of the Bndtools and Maven: A Brave New World workshop (given at EclipseCon 2017) and the corresponding git repository: osgi-community-event2017.

The corresponding effective-osgi maven archetypes used during the workshop are still working well. I could follow the step-by-step guide (in the readme of the maven archetypes project). I got everything working as described and I could find enough explanations about the generated projects. I think I understood what I did and this is very important when you start.

After some cleanup and a switch from Apache Felix to Eclipse Equinox, I got my running setup and I answered my question: "How to start with OSGi without PDE and Tycho".

The corresponding code is in this folder: effectiveosgi-example.

January 12, 2020 11:00 PM

4 Years at The Linux Foundation

by Chris Aniszczyk at January 03, 2020 09:54 AM

Late last year marked the 4th year anniversary of the formation of the CNCF and me joining The Linux Foundation:

As we enter 2020, it’s amusing for me to reflect on my decision to join The Linux Foundation a little over 4 years ago when I was looking for something new to focus on. I spent about 5 years at Twitter which felt like an eternity (the average tenure for a silicon valley employee is under 2 years), focused on open source and enjoyed the startup life of going from a hundred or so engineers to a couple of thousand. I truly enjoyed the ride, it was a high impact experience where we were able to open source projects that changed the industry for the better: Bootstrap (changed front end development for the better), Twemoji (made emojis more open source friendly and embeddable), Mesos (pushed the state of art for open source infrastructure), co-founded TODO Group (pushed the state of corporate open source programs forward) and more!

When I was looking for change, I wanted to find an opportunity that could impact more than I could just do at one company. I had some offers from FAANG companies and amazing startups but eventually settled on the nonprofit Linux Foundation because I wanted to build an open source foundation from scratch, teach other companies about open source best practices and assumed non profit life would be a bit more relaxing than diving into a new company (I was wrong). Also, I was throughly convinced that an openly governed foundation pushing Kubernetes, container specifications and adjacent independent cloud native technologies would be the right model to move open infrastructure forward.

As we enter 2020, I realize that I’ve been with one organization for a long time and that puts me on edge as I enjoy challenges, chaos and dread anything that makes me comfortable or complacent. Also, I have a strong desire to focus on efforts that involve improving the state of security and privacy in a connected world, participatory democracy, climate change; also anything that pushes open source to new industries and geographies.

While I’m always happy to entertain opportunities that align to my goals, the one thing that I do enjoy at the LF is that I’ve had the ability to build a variety of new open source foundations improving industries and communities: CDF, GraphQL Foundation, Open Container Initiative (OCI), Presto Foundation, TODO Group, Urban Computing Foundation and more.

Anyways, thanks for reading and I look forward to another year of bringing open source practices to new industries and places, the world is better when we are collaborating openly.

by Chris Aniszczyk at January 03, 2020 09:54 AM

An update on Eclipse IoT Packages

by Jens Reimann at December 19, 2019 12:17 PM

A lot has happened, since I wrote last about the Eclipse IoT Packages project. We had some great discussions at EclipseCon Europe, and started to work together online, having new ideas in the progress. Right before the end of the year, I think it is a good time to give an update, and peek a bit into the future.


One of the first things we wanted to get started, was a home for the content we plan on creating. An important piece of the puzzle is to explain to people, what we have in mind. Not only for people that want to try out the various Eclipse IoT projects, but also to possible contributors. And in the end, an important goal of the project is to attract interested parties. For consuming our ideas, or growing them even further.

Eclipse IoT Packages logo

So we now have a logo, a homepage, built using using templates in a continuous build system. We are in a position to start focusing on the actual content, and on the more tricky tasks and questions ahead. And should you want to create a PR for the homepage, you are more than welcome. There is also already some content, explaining the main goals, the way we want to move forward, and demo of a first package: “Package Zero”.


While the homepage is a good entry point for people to learn about Eclipse IoT and packages, our GitHub repository is the home for the community. And having some great discussions on GitHub, quickly brought up the need for a community call and a more direct communication channel.

If you are interested in the project, come and join our bi-weekly community call. It is a quick, 30 minutes call at 16:00 CET, and open to everyone. Repeating every two weeks, starting 2019-12-02.

The URL to the call is: You can also subscribe to the community calendar to get a reminder.

In between calls, we have a chat room eclipse/packages on Gitter.

Eclipse IoT Helm Chart Repository

One of the earliest discussion we had, was around the question of how and were we want to host the Helm charts. We would prefer not to author them ourselves, but let the projects contribute them. After all, the IoT packages project has the goal of enabling you to install a whole set of Eclipse IoT projects, with only a few commands. So the focus is on the integration, and the expert knowledge required for creating project Helm chart, is in the actual projects.

On the other side, having a one-stop shop, for getting your Eclipse IoT Helm charts, sounds pretty convenient. So why not host our own Helm chart repository?

Thanks to a company called Kiwigrid, who contributed a CI pipeline for validating charts, we could easily extend our existing homepage publishing job, to also publish Helm charts. As a first chart, we published the Eclipse Ditto chart. And, as expected with Helm, installing it is as easy as:

Of course having a single chart is only the first step. Publishing a single Helm charts isn’t that impressive. But getting an agreement on the community, getting the validation and publishing pipeline set up, attracting new contributors, that is definitely a big step in the right direction.


I think that we now have a good foundation, for moving forward. We have a place called “home”, for documentation, code and community. And it looks like we have also been able to attract more people to the project.

While our first package, “Package Zero”, still isn’t complete, it should be pretty close. Creating a first, joint deployment of Hono and Ditto is our immediate focus. And we will continue to work towards a first release of “Package Zero”. Finding a better name is still an item on the list.

Having this foundation in place also means, that the time is right, for you to think about contributing your own Eclipse IoT Package. Contributions are always welcome.

The post An update on Eclipse IoT Packages appeared first on ctron's blog.

by Jens Reimann at December 19, 2019 12:17 PM

Eclipse m2e: How to use a WORKSPACE Maven installation

by kthoms at November 27, 2019 09:39 AM

Today a colleague of me asked me about the Maven Installations preference page in Eclipse. There is an entry WORKSPACE there, which is disabled and shows NOT AVAILABLE. He wanted to know how to enable a workspace installation of Maven.

Since we both did not find the documentation of the feature I digged into the m2e sources and found class MavenWorkspaceRuntime. The relevant snippets are the method getMavenDistribution() and the MAVEN_DISTRIBUTION constant:

private static final ArtifactKey MAVEN_DISTRIBUTION = new ArtifactKey(
      "org.apache.maven", "apache-maven", "[3.0,)", null); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$


protected IMavenProjectFacade getMavenDistribution() {
  try {
    VersionRange range = VersionRange.createFromVersionSpec(getDistributionArtifactKey().getVersion());
    for(IMavenProjectFacade facade : projectManager.getProjects()) {
      ArtifactKey artifactKey = facade.getArtifactKey();
      if(getDistributionArtifactKey().getGroupId().equals(artifactKey.getGroupId()) //
          && getDistributionArtifactKey().getArtifactId().equals(artifactKey.getArtifactId())//
          && range.containsVersion(new DefaultArtifactVersion(artifactKey.getVersion()))) {
        return facade;
  } catch(InvalidVersionSpecificationException e) {
    // can't happen
  return null;

From here you can see that m2e tries to look for workspace (Maven) projects and to find one the has the coordinates org.apache.maven:apache-maven:[3.0,).

So the answer how to enable a WORKSPACE Maven installation is: Import the project apache-maven into the workspace. And here is how to do it:

  1. Clone Apache Maven from
  2. Optionally: check out a release tag
    git checkout maven-3.6.3
  3. Perform File / Import / Existing Maven Projects
  4. As Root Directory select the apache-maven subfolder in your Maven clone location

Now you will have the project that m2e searches for in your workspace:

And the Maven Installations preference page lets you now select this distribution:

by kthoms at November 27, 2019 09:39 AM

Eclipse startup up time improved

November 05, 2019 12:00 AM

I’m happy to report that the Eclipse SDK integration builds starts in less than 5 seconds (~4900 ms) on my machine into an empty workspace. IIRC this used to be around 9 seconds 2 years ago. 4.13 (which was already quite a bit improved used around 5800ms (6887ms with EGit and Marketplace). For recent improvements in this release see Thanks to everyone who contributed.

November 05, 2019 12:00 AM

Setup a Github Triggered Build Machine for an Eclipse Project

by Jens v.P. ( at October 29, 2019 12:55 PM

Disclaimer 1: This blog post literally is a "web log", i.e., it is my log about setting up a Jenkins machine with a job that is triggered on a Github pull request. A lot of parts have been described elsewhere, and I link to the sources I used here. I also know that nowadays (e.g., new Eclipse build infrastructure) you usually do that via docker -- but then you need to configure docker, in which

by Jens v.P. ( at October 29, 2019 12:55 PM

LiClipse 6.0.0 released

by Fabio Zadrozny ( at October 25, 2019 06:59 PM

LiClipse 6.0.0 is now out.

The main changes is that many dependencies have been updated:

- it's now based on Eclipse 4.13 (2019-09), which is a pretty nice upgrade (in my day-to-day use I find it appears smoother than previous versions, although I know this sounds pretty subjective).

- PyDev was updated to 7.4.0, so, Python 3.8 (which was just released) is now already supported.


by Fabio Zadrozny ( at October 25, 2019 06:59 PM

Qt World Summit 2019 Berlin – Secrets of Successful Mobile Business Apps

by ekkescorner at October 22, 2019 12:39 PM

Qt World Summit 2019

Meet me at Qt World Summit 2019 in Berlin


I’ll speak about development of mobile business apps with

  • Qt 5.13.1+ (Qt Quick Controls 2)
    • Android
    • iOS
    • Windows 10


Qt World Summit 2019 Conference App

As a little appetizer I developed a conference app. HowTo download from Google Play Store or Apple and some more screenshots see here.


sources at GitHub

cu in Berlin

by ekkescorner at October 22, 2019 12:39 PM

A nicer icon for Quick Access / Find Actions

October 20, 2019 12:00 AM

Finally we use a decent icon for Quick Access / Find Actions. This is now a button in the toolbar which allows you to trigger arbitrary commands in the Eclipse IDE.

October 20, 2019 12:00 AM

A Tool for Jakarta EE Package Renaming in Binaries

by BJ Hargrave ( at October 17, 2019 09:26 PM

In a previous post, I laid out my thinking on how to approach the package renaming problem which the Jakarta EE community now faces. Regardless of whether the community chooses big bang or incremental, there are still existing artifacts in the world using the Java EE package names that the community will need to use together with the new Jakarta EE package names.

Tools are always important to take the drudgery away from developers. So I have put together a tool prototype which can be used to transform binaries such as individual class files and complete JARs and WARs to rename uses of the Java EE package names to their new Jakarta EE package names.

The tools is rule driven which is nice since the Jakarta EE community still needs to define the actual package renames for Jakarta EE 9. The rules also allow the users to control which class files in a JAR/WAR are transformed. Different users may want different rules depending upon their specific needs. And the tool can be used for any package renaming challenge, not just the specific Jakarta EE package renames.

The tools provides an API allowing it to be embedded in a runtime to dynamically transform class files during the class loader definition process. The API also supports transforming JAR files. A CLI is also provided to allow use from the command line. Ultimately, the tool can be packaged as Gradle and Maven plugins to incorporate in a broader tool chain.

Given that the tool is prototype, and there is much work to be done in the Jakarta EE community regarding the package renames, I have started a list of TODOs in the project' issues for known work items.

Please try out the tool and let me know what you think. I am hoping that tooling such as this will ease the community cost of dealing with the package renames in Jakarta EE.

PS. Package renaming in source code is also something the community will need to deal with. But most IDEs are pretty good at this sort of thing, so I think there is probably sufficient tooling in existence for handling the package renames in source code.

by BJ Hargrave ( at October 17, 2019 09:26 PM

I’ll never forget that first EclipseCon meeting with you guys and Disney characters all around and…

by Doug Schaefer at October 16, 2019 01:18 AM

I’ll never forget that first EclipseCon meeting with you guys and Disney characters all around and the music. And all the late nights in the Santa Clara bar and summits and meetings talking until no one else was left. Great times indeed. Until we meet again Michael!

by Doug Schaefer at October 16, 2019 01:18 AM

Missing ECE already? Bring back a little of it - take the survey!

by Anonymous at October 15, 2019 09:22 PM

We hope you enjoyed the 2019 version of EclipseCon Europe and OSGi Community Event as much as we did.

Please share your thoughts and feedback by completing the short attendee survey. We read all responses, and we will use them to improve next year's event.

Speakers, please upload your slides to your session page. Attendees really appreciate this!

by Anonymous at October 15, 2019 09:22 PM

Open Source Gerrymandering

by Chris Aniszczyk at October 08, 2019 06:20 PM

Over the years, I have spent a lot of time thinking about and working on open source communities… from bootstrapping projects out of corporations (or broken communities), to starting brand new open source foundations.

I was recently having a conversation with an old colleague about bringing an open source project out of a company into the wild and how to setup the project for success. A key part of that discussion involved setting up the governance for the project and what that means. There was also discussion how neutral and open governance under a nonprofit foundation can be good for certain projects as research has shown that neutral foundations can promote growth and community better than other approaches. Also the conversation led to a funny side discussion on the concept of gerrymandering and open source.

For those who aren’t familiar with the term, it’s become popular in the US political lexicon as a “practice intended to establish a political advantage for a particular party or group by manipulating district boundaries.� A practical example of this is from my town of Austin TX which is in district 35 which snakes all the way from Austin to San Antonio for some reason.

The same concept of gerrymandering can apply to open source communities as open source projects can act like mini political institutions (or bigger ones in the case of Kubernetes). I shared some of my favorite examples with my friend so I figured I’d write this down for future reference and share it with folks as you really need to read the “fine print� to find these at times.

Apache Cassandra

The Apache Software Foundation (ASF) is a fantastic open source organization that has been around for a long time (they celebrated their 20th anniversary) and has had a lot of impact across the world. The way projects are governed in the ASF are through the Apache Way, which places a lot of emphasis on “community over code� amongst some other principles which are great practices for open source projects to follow.

There have been some interesting governance issues and lessons learned over the years in the ASF, in particular it can be challenging when you have a strong single vendor associated with a project as was with the case with Cassandra awhile ago:

As the ASF board noted in the minutes from its meeting with DataStax representatives, “The Board expressed continuing concern that the PMC was not acting independently and that one company had undue influence over the project.” There was some interesting press around the time this happened:

“Jagielski told me in an interview, echoing what he’d said on the Cassandra mailing list, that undue influence conflicts with project leadership obligations established by the ASF. As he suggested, the ASF tried many times to get a DataStax-heavy Project Management Committee (PMC) to pay attention to alleged trademark and other violations, to no avail. Whatever DataStax’s positive influence on the development of the project—in other words—it failed to exercise equivalent influence on governing the project in ASF fashion.â€�

The ASF basically forced a reorganization of the Cassandra PMC to be in more in lines with its values and then caused the primary vendor behind the project to pull engineers off the open source project.


The containerd project is an industry-standard container runtime with an emphasis on simplicity, robustness and portability. The history of the project comes from being born at Docker where their open source projects had a governance policy essentially aligned with the BDFL philosophy with one of their project founders.

In CNCF, (which containered is a project of), project governance documents aren’t considered static and evolve over time to meet the needs of their community. For example, when containerd joined the CNCF their governance was geared towards a BDFL approach but over time evolved to a more neutral approach that spread authority across maintainers.

Cloud Foundry

Cloud Foundry is an open source community that has a large and mature ecosystem of PaaS focused projects. In the Cloud Foundry Foundation (CFF), they have a unique governance clauses in regards to how affiliates are treated and voting.

Pivotal Platinum Director Voting Power. The Platinum Director appointed by Pivotal (“Pivotal Director�) shall have five (5) votes on any matter submitted to a vote of the Board. (i) On a date one (1) year after the incorporation date set forth in the Certificate, the number of Pivotal Director’s votes will be reduced to three (3). (ii) On a date two (2) years after the incorporation date set forth in the Certificate, the number of Pivotal Director’s votes will be reduced to one (1)

To bootstrap the foundation, the originating company wanted a little bit of control for a couple of years, which can make sense in some situations as the beginning of a foundation can be a tumultuous time. In my opinion, it’s great to see the extra vote clause expire after 2 years, however, it’s still very unfair to the early potential members of the organization.

Another example of open source gerrymandering can be how votes are represented by member companies that are owned by a single entity:

At no time may a Member and its Affiliates have more than one Director who is an employee, officer, director, or consultant of that Member, except that Pivotal, EMC, and VMware, though Affiliates, shall each have one (1) Director on the Board).

This is an interesting tidbit given that Dell owns Pivotal, EMC and VMWare. In some organizations, usually there is legal language that collapses owned entities into one vote.

I personally I’m not the biggest fan of this approach as it makes things unfair from the beginning and can be an impediment to wide adoption across the industry. There can definitely be reasons of why you need to do this in the formation phase but it should be done with caution. If you saw the recent news that Pivotal was being spun back into VMWare and their woes with adoption, it shouldn’t come as a surprise in my opinion as one company was bearing too much of the burden in my opinion and not building a diverse community of contributors.

Cloud Native Computing Foundation (CNCF)

If you remember the early days of the container and orchestration wars, there was a lot different technologies, approaches and corporate politics. When CNCF was founded, the original charter included a clause that upgraded certain startup members from Silver to Platinum that were important in the ever evolving cloud native ecosystem.

“The Governing Board may extend a Platinum membership at the Silver Membership Scale rates on a year-by-year basis for up to 5 years to startup companies with revenues less than $50 million that are deemed strategic technology contributors by the Governing Board.�

In my opinion, that particular piece in the charter was important in bringing together all the relevant startups to the table along with the big established companies at the time.

In terms of projects, the CNCF Technical Oversight Committee (TOC) defines a set of principles to steward the technical community. The most important principle is around a minimum viable governance that enables projects to be self-governing. TOC members are available to provide guidance to the projects but do not control them.

Unlike Apache and the Apache Way, CNCF does not require its hosted projects to follow any specific governance model. Instead, CNCF specifies that graduated projects need to “explicitly define a project governance and committer process.� So in reality, CNCF operates under the principle of subsidiarity, encouraging decisions to be made at the lowest project level consistent with their resolution.


GitLab is a fantastic open source project AND company that I admire deeply for their transparency. The way the GitLab project is structured is that it’s wholly owned by the GitLab company (they also own the trademark). To the credit of GitLab, they make this clear via their stewardship principles online and discuss what they consider enterprise product work versus project work.

I’d love for them in the future to separate the branding from the company, project and the product as I believe it’s confusing and dilutes the messaging, but that’s just my opinion 🙂


Istio is a popular service mesh project originated at Google. It has documented its governance model publicly:

However, as you can see, it’s heavily tilted towards Google and there seems to be no limits on the number of spots on the steering committee from one company which is a common tactic in open governance approaches to keep things fair. On top of that, Google owns the trademark, domains and other project assets so I’d consider Istio to be heavily gerrymandered in Google’s versus the community’s interest.


I had the pleasure of serving on the Java Community Process (JCP) Executive Committee for a few years while I was at Twitter. It’s a great organization that drives standardization across the Java ecosystem, some of the fine print is interesting though:

“The EC is composed of 25 Java Community Process Members whose seats are allocated as follows: 16 Ratified Seats, 6 Elected Seats, and 2 Associate Seats, plus one permanent seat held by Oracle. (Oracle’s representative must not be a member of the PMO.) The EC is led by a non-voting Chair from the PMO.â€�

This essentially gives Oracle a permanent seat on the Executive Committee.

Here’s another fun clause:

Ballots to approve Umbrella JSRs that define the initial version of a new Platform Edition Specification or JSRs that propose changes to the Java language are approved if (a) at least a two-thirds majority of the votes cast are “yes” votes, (b) a minimum of 5 “yes” votes are cast, and (c) Oracle casts one of the “yes” votes. Ballots are otherwise rejected.

This essentially gives Oracle a veto vote on any JSR.

Note: The coolest thing the JCP has done is contribute the EE specification work to the Eclipse Foundation and form the Jakarta project over there to steward things in an open way.


Knative, like Istio mentioned above, is an open source project that was born at Google and controlled by Google. There have been a lot of discussion lately about this as Google recently decided to not openly govern the project and move it to a neutral foundation:


Kubernetes operates under the auspices of the CNCF and openly governed by the Kubernetes Steering Committee (KSC). The Kubernetes project has grown significantly over time, but has done a great job of keeping things openly governed and inclusive in my opinion, especially compared to its project size these days. The KSC governs the project along with a variety of sub working groups. Also, the Kubernetes trademark is neutrally owned by the CNCF and openly governed via the Conformance Working Group which decides how certification works for the community, which there are nearly 100 certified solutions out there!


The Spinnaker project was originally born at Netflix and recently spun out into the Continuous Delivery Foundation (CDF) as an openly governed project. The project assets, from domains to github to trademarks are all neutrally owned by the community through the CDF.


Vault is a fantastic and widely used secrets management tool from Hashicorp. It’s a single vendor controlled open source project that has an open core model with an open source and enterprise versions (see matrix). What this essentially means is that the buck stops at the single vendor on what features/fixes end up in the open source version, most likely that won’t include things that they sell in their enterprise offering.


I hope you learned something new about open source projects, foundations and communities as these things can be a little bit more complicated as you dig into the details. It’s really important to note that there is a difference between open source and open governance and you should always be skeptical of a project that claims it’s truly open if only one for profit company owns all the assets and control. While there’s nothing wrong with this approach at all, most organizations don’t set expectations up front which can lead to frustrations down the road. Note, there’s nothing wrong with single vendor controlled open source projects, I think they are great but I think they need to be upfront, similar to what GitLab stewardship principles on what they will put in open source versus their enterprise version.

In conclusion, as with anything in life, you should always read the fine print of an open source communities charter or legal paperwork to understand how it works. The lesson here is that every organization or project has its own rules and governance and it’s important that you understand how decisions are made and who has ownership of project assets like trademarks.

by Chris Aniszczyk at October 08, 2019 06:20 PM

JShell in Eclipse

by Jens v.P. ( at October 08, 2019 12:16 PM

Java 9 introduced a new command line tool: JShell. This is a read–eval–print loop (REPL) for Java with some really nice features. For programmers I would assume writing a test is the preferred choice, but for demonstrating something (in a class room for example) this is a perfect tool if you are not using a special IDE such as BlueJ (which comes with its own REPL). The interesting thing about

by Jens v.P. ( at October 08, 2019 12:16 PM

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