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If you want to listen to method's signature changes you have to add a listener to particular CallableFeature object and also to all of its parameters. Just then you are aware of all important changes connected with parameters. IMO the event model of CallableFeature deserves simplification. The change of parameter's type should result in an attribute event on the related method. It would save all these registrations of the listener to existing parameters in most cases.
Javacore module was replaced by Retouche infrastructure. This bug is not valid in trunk any more.
Reorganization of java component