First I added
http://deadlock.netbeans.org/hudson/job/javadoc-nbms/lastSuccessfulBuild/artifact/nbbuild/nbms/updates.xml.gz to the
plugin manager then I choosed the groovy plugin and clicked on "install". But in the new opened window appears the message:
Missing required modules for Plugin Java Source:
Java Source [module org.netbeans.modules.java.source = 1]
Created attachment 54965 [details]
Missing required modules for Plugin Java Source
You did it in 6.0 final?
Yes, I use NetBeans 6.0 final.
So that's the problem. Groovy/Grails support is not available for 6.0 (only early snapshot on plugins.netbeans.org is available) because we are using new APIs
introduced after 6.0. Currently you must use daily builds to test Groovy/Grails support. I am closing this as wontfix.
But it is curious that the plugin works with NetBeans 6.0 final under Windows.
I don't understand either. Anyway, you should not add that UC to 6.0 final. It is not compatible.