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Trying to build Grails plugin projects yields an error because it tries to run the "war" target. The "war" target is correct for building Grails apps but not Grails plugins. The build target for plugins should probably be "package-plugin" or "install-plugin". I marked this as a P1 because there's currently no way you can do a build through Netbeans (although you can compile), and attempting to build causes unnecessary artifacts to be added to the project (since it tries to run the "war" target). I'm using Grails 2.0, but I believe the problem is the same for previous versions.
How did you create Grails plugin project at the first place? Could you provide some dummy plugin project or a set of steps, so I'll be able to reproduce the issue? It seems to me more like a missing feature than a bug in the current code.
*** This bug has been marked as a duplicate of bug 179547 ***