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In trying to reproduce issue #47592, I shut down the IDE while the file DiffProvider.java was open in the editor. I got a stack trace on the console as the IDE shut down.
Created attachment 16998 [details] Stack trace referring to projectless source file
This is not an exception, it is an informational stacktrace. Should be harmless, but probably should not happen. Do you remember if it was printed out before or after the Main window disappeared?
Stack trace, fine. :-) Sorry, don't remember exactly, but I believe the main window was already closed at the time it appeared.
The stacktrace is produced by Thread.dumpStack(). Due to the order in which modules are shut down, it can happen that javacore tries to access MDR after MDR was shut down. We cannot throw exception in such case and it is hard to ignore calls to MDR, so we try to serve them, but the database and indexes are already all flushed to the disk and nothing that happens after that is persisted. So it shouldn't cause any inconsistency for the next run of the IDE thus should be harmless.
*** Issue 48044 has been marked as a duplicate of this issue. ***
happend to me today. i had a empty class opened in editor, I copied the class body (in attachment) to the editor and exception appeared. -reproducible - create a empty file aaaaaa.java in a project, copy attached text to it, exception in console appears
Created attachment 19483 [details] copy it to an empty file and exceptio in console appears
old target milestone, please re-evaluate
*** Issue 53983 has been marked as a duplicate of this issue. ***
The exceptions during shutdown are duplicates of issue 61910. Changing summary of this issue to cover the testcase provided by lhasik.
I am closing all reports in category Java/Unsupported as wontfix. These should be dead issues --- if the reported cases are against some live part of the NetBeans IDE please reopen and we can discuss to which category they belong.