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[nb_dev](200406241800), [jdk1.5.0](b51) Steps to reproduce: - run IDE - create JFrame file - try to add JButton -> NullPOinterException rises (see attachment)
Created attachment 16013 [details] NullPoitnerException
The attached exception can occur only when the form file is not a part of a project. In such a situation we cannot do much - - we don't know the origin of the required classes. The exception has been modified to mention this fact. I am sorry I am not able to reproduce this issue in a normal way => closing as works for me.
I can't reproduce it any more ... verified in [nb_dev](200406291800)