I just installed Eclipse 4.3.2 (EE) and then immediately installed the Groovy plugin for it (from this link - I used http://dist.springsource.org/release/GRECLIPSE/e4.2/ as the plugin site).
Upon restarting Eclipse I created a new Groovy Project, and then added a new package (com.me.myapp) and then tried to add a new Groovy class to this package.
This prompted Eclipse to open a Create new Groovy Class dialog. I added a name for my class (ExampleGroovy) and then clicked "Finish" to create the class.
Upon doing this I am getting the following error:
Errors occurred during the build.
Errors running builder 'Java Builder' on project 'MyApp'.
org/codehaus/jdt/groovy/integration/LanguageSupportFactory
Have I configured Groovy incorrectly, or did the makers of the Groovy-Eclipse plugin publish something that just doesn't work?
Perhaps the update site URL for Kepler you used is incorrect. It should be http://dist.springsource.org/release/GRECLIPSE/e4.3 probably.
I personally always use this update site http://download.springsource.com/release/TOOLS/update/e4.3 and pick Groovy Eclipse there. What's you JDK version?