"class already exists" using annotation processor

Hey all,

Under recent EAP and HEAD@master builds ( not sure about stable builds off hand ) when using annotation processors such as ADT4j and Immutables from within a Maven project ( source files in target/generated-sources/annotations ) when I try and compile/run tests within IntelliJ, I get a compilation error saying the class already exists ( the .java file ) even tho I have IntelliJ set to clear the target directories on build.

Has anyone else seen anything similar to this at all? Or is possible my project is just a bit messed up?

Mark