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-create a new java app -copy some groovy script/file to it and open the file in the editor => editor correctly shows compilation errors -go to project props and enable groovy there or add groovy-all.jar to project libraries => editor still shows compilation errors workaround is to re-open the file
Closing as WONTFIX. In the current version there is no other way how to activate groovy than by creating new Script/Class/Groovy JUnit test. And those actions refresh CP correctly. The old groovy project properties tab was deleted about a release ago because it wasn't much useful and it caused some other issues. I know it isn't a nicest solution but from my point of view the only other option we got here is to add groovy as a part of standard java application (which I don't think we should do with current groovy support ;))