I'm not sure if this is a bug, or just a missing feature. Auto-completion in the groovy editor doesn't seem to work for references annotations implemented in Java.

So, for example if I am working with the Spring Framework and annotate a method with a request mapping I should be able to type in @RequestMapping(" then press Ctrl+Space to see a list of all the parameters I can provide. This is not happening when I am annotating Groovy files with the Groovy editor.