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It seems that you can not attach Groovy class changes while debugging with my current setup. Running an app on Glassfish V2 and using mvn to build the projects. If I try to attach any changes all it does is recompile all the groovy classes, but doesn't see any as being changed. Nothing in the 'Classes to reload: []' part of the output. I can put a breakpoint in the groovy classes and NB will stop there so I know it sees the sources alright. I'm using Gmaven 1.6; mvn version 1.0-rc-5
Class changes are not supported right now.