Using Eclipse with JRuby Truffle

This is an experiment, mainly to have a much better feedback from the Truffle annotation processor and ideally much faster compile time!

Using integrated Maven support

Create a new workspace in Eclipse (>= Luna).

Start by ensuring there is no leftover configuration:

$ rm -rf core/.classpath core/.settings core/.project

We can now import the project:

• From the main menu bar, select File > Import...
• Select Maven > Existing Maven Projects
• Select jruby/core directory as root directory (NOT just jruby)
• Click Finish

And now enable the Truffle annotation processor:

• From the main menu bar, select Project > Properties
• Select Java Compiler > Annotation Processing
• Click on Enable project specific settings, then OK
• Click Yes to rebuild the project.

You shall be set!

It is possible to run JRuby with a run configuration for org.jruby.Main.main().
Further integration is under investigation.

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Old technique not using Maven support

Be sure to have the project built before with mvn.

Maven can be used to generate Eclipse project files:

mvn eclipse:eclipse

Create a new workspace in Eclipse, outside the jruby directory (otherwise Eclipse complains about overlapping dirs).

We need to set the path to your Maven repository (usually ~/.m2/repository):

• From the menu, select Window > Preferences
• In the search field type Classpath Variables
• Click on New and enter the variable name: M2_REPO
• Click on Folder... and select your home, then .m2 then repository

We can now import the project:

• From the main menu bar, select File > Import...
• Select General > Existing Projects into Workspace
• Enter the jruby directory in root directory
• Click Finish

Close the jruby-tests project since the setup is wrong for now.

There are some for now unsolved errors in JRuby generated files, so in the Package Explorer, open target/generated-sources, then right click on org.jruby and select Build Path > Exclude.

Now it should start to work to some extent!