Most operations involving code refactoring or automatic insert of code lines (implements abstract methods, fix imports, ...) throw exceptions (java.lang.IllegalStateException)
This behaviour continues since a long time, but does not prevent manual modifications, so that development went on. But this is really annoying as long as the size of the project grows.
I think that this is mainly a NetBeans bug. Maybe there are also problems on my code, but I need some hint to fix them.
Thank you very much.