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< Nebula
Revision as of 09:23, 28 February 2017 by (Talk | contribs) (Patches without a signed CLA)


Welcome to the Eclipse Nebula project. We love new contributions. We provide the Eclipse community with a large set of rich UI compoments. So thank you for considering your contribution.



We use Gerrit to accept all your patches.

Get your Eclipse Credentials

To provide patches to Nebula, create an Eclipse account, sign the ECA and get a GitHub account.

Create a GitHub Account

Create a GitHub account (or use your existing one)

Create an Eclipse Account

Create an Eclipse Account (or use your existing one) and set your GitHub account (this will tell Eclipse who you are on GitHub)

Sign the ECA

Sign the ECA

Three Ways to Setup Your IDE

To setup your IDE there are three possibilities. Using the project set file is the easiest for newcomers.

  1. Import our PSF file
  2. Use Oomph
  3. Setup manually

1. Import Project Set File

In an empty workspace select the URL below and open File/Import... en find Team/Team Project Set. Paste the url in the wizard that appears and lean back.

The PSF file will import all wizards and assign projects to working sets for your convenience.

The wizard will fail if git was not setup correctly or if the nebula git directory already exist or if any of the projects already exists. In this case, install git, remove the nebula directory, run with a clean workspace or any combination of the previous options.

2. Import with Oomph

Use the Eclipse installer or, if you have already installed Oomph, use the Oomph import wizard and select Nebula. If Nebula is not in the list, add this setup file.

3. Clone the GIT Repo Manually

The Nebula repository on GitHub is here: For example:

 C:\Users\You\git>git clone

Find the Nebula Examples View

Run Eclipse

Create a new run configuration and press Run

Nebula ide3.png

Open Nebula Perspective

Open the Nebula perspective and find the example view for your widget and test your changes. You can also test your changes by using the widget in a snippet or in your own project.

File a bug

File a bug against the correct component and version.

Patches with a signed CLA

To provide patches to Nebula, create an Eclipse account, get your Gerrit password and push your changes to the Gerrit git repo.

Please always use a valid bugnumber and use the following commit message:

Bug bugnumber  bug description 
<empty line>
Good description of the changes you made.

Change-Id: I0000000000000000000000000000000000000000 
Signed-off-by: Wim Jongman <>

To update an Existing commit, use the change Id that Gerrit has created for your original commit:

Bug bugnumber  bug description 
<empty line>
Good description of the changes you made.

Change-Id: yaddieyaddieyaddieyaddieyaddieyaddieyaddieyaddie
Signed-off-by: Wim Jongman <>

Patches without a signed CLA

We cannot accept patches, in any form, without a signed CLA.

Building locally and on our server

Every patch you supply with Gerrit gets build immediately. You can find the Gerrit jobs here which also includes the build repository.

To build locally refer to the builds page

New Widgets

Before you decide to contribute your code to Eclipse, keep in mind that your code must follow the EPL, Eclipse's Public License. This means that committers and contributors need to follow some rules.

A good overview of what this entails and how this affects you can be read here.

There are two ways of contributing your code.

  1. One or more new widgets in the Nebula Incubation project.
  2. A new project inside Nebula

If you choose the first option, read on. If you choose the second option, please contact the Nebula lead through the mailing list and make your intentions clear. Then continue to read on this page.

Introduce Yourself and your Widget(s)

If we don't know you, please take the time to introduce yourself to the Nebula mailing list. Be elaborate. Things that you talk about could be your contributions, the bugs that you have filed, the patches that you committed, your experience in UI development, etcetera. We need to know that you are a the kind of person that we want to have on board. If you are not comfortable with this, it could also be enough to point to the code that you want to contribute and tell us how this could be useful to the greater Nebula community.

You can subscribe to the mailing list by writing a mail to the mailing list administrator. How this is done is all explained on this page. Tell us what your plans are and what your UI component does. Then wait for the discussion. If nothing happens immediately: be patient and persistent. We love new contributions.

Code Quality and Citizenship

Once part of the Nebula project, your code is visible to thousands of developers. Make sure that you provide quality code. Also make sure that your widget is stable even if your API is not. The work that you provide represents the complete Nebula community. Ask on the list if you are not sure. Take a look at the widget author tips. The user interface is a very important part of any application.

Once you are in the project, take care of your bug reports and make sure that they are followed up. We require that you do not only take care of your own component but also look after the greater Nebula together with the other active committers.

Widget Vote

As soon as the contribution becomes serious, the lead will start a vote for the new contribution. This is an internal procedure for the Nebula project. The vote period is one week. For the vote to pass, we require no (0) -1's. Everybody can express their opinion but only committer votes count. The vote will be done through the nebula-dev mailing list.

File a bug to request your contribution

You will be instructed the project lead to file a bug against Nebula core in bugzilla. Before you can do that, you need to get an Eclipse account.

Once the account has been created and the CLA is signed, you need to file a bug against Nebula Core.

Here are some example bugs of previous contributions:

You need to include the source code and additional resources like images and stuff like that (one or more plug-in projects) as an attachement. Only the code that you own and have the copyright. Each source member needs to have the standard EPL header like you see in every Eclipse source. Do not include any third party code. Do not include any zip files in the projects. Just your sources and other resources. You can include some additional information like links to the working product or links to screenshots.

Ready? File a bug against Nebula/Core.

Provide Legal Information

If your code is to be distributed from Eclipse, we need to you comply to some legal rules. One of the rules is the inclusion of copyright notices in source code and legal documents in features and plug-ins.

Information about this is described in A Guide to the Legal Documentation for Eclipse-Based Content which is linked from here.

We will assess your contribution

We will take a look at your code to assess the quality. If we have problems with it we will let you know on the bug. We will also do a preliminary check on any IP (Intelectual Property) issues. After this is done, the project lead will file a new bug in a separate Bugzilla system known as IPZilla. This bug is called a CQ (Contribution Questionnaire).

Here an automatic scanning of the source will take place. It will be examined on foul words, religious statements, terroristic information and all that. You will also need to declare that you have the rights to the code.

One of the Eclipse PMC members will do some magic and authorize the CQ. After this has been done, we have to wait on the Eclipse legal team to do a triage on the code and give their final OK.

Committer vote

The Eclipse committer vote is normally based on meritocracy. This means that you are invited by the community to participate based on what you have done. In case of a new widget contribution, the Nebula project lead deviates from this rule but proposing you as committer as soon as the code is accepted by Eclipse legal.

The voting process is a formality but you cannot have any votes against you (-1). Once you are voted in (three or more +1), you will be provided with an Eclipse committer ID by the Eclipse Webmasters.

The rationale for this process is based on the fact that there is no common code base in Nebula. All widgets are self sustained and isolated pieces of code, mostly maintained by their original contributor.

Only one committer is initially voted in. If your team consists of more than one committer then the other committers can earn their way in by providing contributions and showing their support to the Nebula project.

If you want to come on board immediately with more than one new committer, this can only be done by filing a new project.

Create a Contribution to the Example View

Nebula contains an overall Example View that provides an extension point. With this extension point you can contribute a Tab to the view that shows all the details of your widget.

All Nebula Widgets are required to contribute to this extension point in a separate bundle.

Organize your Code

You will get your own personal slot in the Nebula git repository.your component will be included into this folder. A GitHub mirror exists, but it cannot be used for pushing. It is also possible to become a sub project of the greater Nebula. You will then operate semi-independent from Nebula and take care of your own builds and repository.

If you are not your own sub project then you will first start in the Nebula incubation area. You will need to provide several components to become part of the Nebula code.

Lets take a look at the structure of the Oscilloscope widget.

  • org.eclipse.nebula.widgets.oscilloscope
    This is the main code of this widget. It is included in one project but your UI component can span more than one project. Please follow the namespace and discuss on the mailing list what the best name of the component can be.
  • org.eclipse.nebula.widgets.oscilloscope.example
    This is the contribution to the Example view. Every component is required to contribute to the example view. Here you can showcase your widget. Make it as fancy as possible.
  • org.eclipse.nebula.widgets.oscilloscope.feature
    The feature project that will contain only your UI component. Please take a look at the contents of other features for inspiration. Make sure to provide the correct naming and descriptions in the feature and follow the same pattern as the other features.
  • org.eclipse.nebula.widgets.oscilloscope.snippets
    This contains the snippets for your code. Snippets contain short code examples on how to use your widget. This is mandatory. See other snippet projects for some inspiration.
  • org.eclipse.nebula.widgets.oscilloscope.tests
    This contains the unit tests for your component. Obviously this is also mandatory. Please provide a code coverage of at least 80%.

Checkin your code

With your committer account you can check-in your code into git. If you are not a committer yet, this will be done for you by one of the current committers. You will need the ssh link as provided on this page. Once your code is checked in, we have to add your widget to the build. If you are comfortable with it and able to do it (committer status), see the releng section of the repository for information and add your component, otherwise drop a line on the list and we are happy to help you with it.

Provide Build information

Build and CI overview

We use tycho to build the Nebula after every commit. Please take a look at the pom.xml files in the other widgets and apply a copy and paste to your projects. Once you think your product is ready for the main stage, give the list a signal. We will then include your widget in the incubation build. It needs to stay there until it is API stable. If you break the build you break everything. So be careful with what you commit, take a keen eye on the build and fix any build errors as soon as possible.

Here are the links to our current build jobs:

Once you are a committer you have access to the build configuration.

Add your component to the build

Add poms to your folders

You will need to add pom.xml in your plugins and features. The best way to achieve that is to copy pom.xml from existing widget (beware, features, tests and bundles have different poms!). For a component myComponent, all poms will look like this:

<?xml version="1.0" encoding="UTF-8"?>
	xmlns="" xmlns:xsi="">
	<packaging>One of (eclipse-test-plugin | eclipse-plugin | eclipse-feature)</packaging>

The only things to change are artifactId which must be your bundle name as defined in MANIFEST.MF, and packaging (for .examples, use eclipse-plugin).

Contribute to aggregation features and update-sites

Nebula contains aggregation features aimed to ease consumption of Nebula widgets. For all the next step, use dedicated editors in Eclipse (to avoid making mistakes), and always keep .qualifier suffix for versions. Add (assuming your new contribution gets into incubation):

  • your .example bundle to the releng/org.eclipse.nebula.incubation.examples.feature/feature.xml.
  • your .feature feature to the included features of releng/org.eclipse.nebula.incubation.feature/feature.xml.
  • your .feature feature to the releng/org.eclipse.nebula.updatesite.incubation/category.xml in category Nebula Individual Incubation Widgets

Contribute to master pom

Tell maven that you want your stuff to be built by adding to releng/org.eclipse.nebula.nebula-incubation/pom.xml <modules>...</modules> the relative path to your artifacts

<project xmlns="" xmlns:xsi=""
	<name>Nebula incubation parent</name>
	<description>Parent pom for all incubation widgets in Nebula</description>
		<!-- Dependencies -->
		<!-- blah-blah .... -->
		<!--myComponent -->
		<!-- blah-blah .... -->
		<!-- Dist -->

Test it locally before committing

From releng/org.eclipse.nebula.nebula-incubation, run a mvn clean install. Sit down and enjoy. If it looks fine you can push.

Add Component to the Website

Once you are a committer, you are able to checkout the website. If you checkin, the new code is published within 5 minutes. How to check out the Nebula website and make changes is explained here. If you have questions please ask them on the list.

Add Documentation to the Wiki

Your component needs to be documented on the main Nebula wiki page.

Watch nebula-inbox

It is required that all committers watch this email address in bugzilla to stay up to date with what is going on in our community. Please login to bugzilla and then change your users-watching settings here:

Become a committer

If you do not provide a new widget contribution but still want to become a Nebula committer then the following applies:

Based on your role in the Eclipse community you can become a full committer in the Nebula project. For this you have to show commitment to the project by maintaining your code and play an active role in the Nebula community as a whole. Once this is established, you are invited by one of current committers of the Nebula project to become a committer. If you feel that you are ready for full committer status but you are not yet invited, you can solicit for the position yourself either through the list or by personal mail to the project lead.

The voting process is a formality but you cannot have any votes against you (-1). Once you are voted in (three or more +1), you will be provided with an Eclipse committer ID by the Eclipse Webmasters.

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