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Created attachment 148230 [details] thread dump In recent builds i get this error quite often. The IDE locks up, and never releases again.
Created attachment 148231 [details] nps
Created attachment 148232 [details] application snapshot
Created attachment 148236 [details] log
I don't think that the IDE lock is permanent. According to attached snapshot AWT is blocked in RefactoringActionsProvider.doFindUsages(), which is waiting for org.netbeans.modules.j2ee.jpa.verification.rules.entity.QueriesProperlyDefined.apply(). Reassigning to java/refactoring for further evaluation.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss