This Maven archetype will help you bootstrap the development of a JDT.LS extension, by creating a project with a nested structure :

 __artifactId__    : parent pom project
 |
 |---__artifactId__.core   : Core extension
 |
 |---__artifactId__.test   : Test extension (Fragment project)
 |
 |---__artifactId__.site : p2 update site

The generated plugin extends the JDT.LS by contributing a custom command, implementing org.eclipse.jdt.ls.core.internal.IDelegateCommandHandler

• Java 1.8
• maven 3.0 or later
• Eclipse Oxygen with PDE or later
• m2e 1.8 or later
• m2eclipse-tycho 0.8 or later

In Eclipse, first add the Open Archetypes catalog :

1. On the Archetypes Preferences page (Windows: Window > Preferences; OS X: Eclipse> Preferences or ⌘,), open Maven > Archetypes, click on the Add Remote Catalog... button

   • Catalog file : http://open-archetypes.github.com/maven-repo/releases/
   • Description : Open Archetypes

2. Click OK to close the dialog

3. Click OK to close the preferences

Open your terminal or Windows CMD:

1. Execute mvn org.apache.maven.plugins:maven-archetype-plugin:2.4:generate -DarchetypeCatalog=http://open-archetypes.github.com/maven-repo/releases/ -DarchetypeGroupId=org.openarchetypes -DarchetypeArtifactId=jdt.ls-extension-archetype
2. Enter the groupId
3. Enter the artifactId
4. Enter the name of the package under which your code will be created
5. Enter the version of your project
6. Confirm

1. Create a new Maven project

• Click Next to land on the Archetype page
• Select the Open Archetypes catalog
• Select jdt.ls-extension and click Next
• Enter the Group Id, Artifact Id and Version informations. Eclipse requires the version to follow a Major.Minor.Micro pattern, so you should use 1.0.0-SNAPSHOT instead of 1.0-SNAPSHOT
• You can change the required properties if needed :
  • java_version : The Java version to be used for compiling the plugins. Supported values are 1.8, 9. Defaults to 1.8
  • tycho_version : the tycho version that will be used to build the project in command line. Defaults to 1.0.0
  • eclipse_platform : the Eclipse platform, will drive what eclipse update site will be used to resolve the Eclipse dependencies. Supported values are : oxygen, photon. Defaults to oxygen .
• Hit Finish
• Wait for awesomeness

Once the projects are created, you'll just have to start coding ...

You can then build your projects in command line, in a terminal, by issuing :

mvn clean verify

A zipped update site will be created as <project.parent>/<project.site>/target/<project.site>-<project.version>-site.zip.

If the project was created with the eclipse_org_signing property set to true, then a sign profile to sign the generated jars will be available to use, when building the project on the Eclipse.org infrastructure, using :

mvn package -Psign