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Started to be thrown repeatedly after I opened PanelSourceFolders.java from java/j2seproject, no idea why. Attaching full log though I think the earlier errors re. Node.Property etc. were printed to the log earlier and may be some unrelated bug.
Created attachment 17146 [details] Stack traces (repeated every time I scrolled the buffer until I closed it)
*** This issue has been marked as a duplicate of 47660 ***
Reorganization of java component