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See the attached exception stacktrace.
Created attachment 16626 [details] NPE
Do you have source code + position on which you invoked Go To Source action? That might help.
Sorry I don't have the files open anymore and don't remember which files I had. I did not invoke Go To Source, I just right-clicked in the opened file to get the popup.
*** This issue has been marked as a duplicate of 46880 ***
Reorganization of java component