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Creating javadoc from menu for the main project led to a repeating NullPointerException which i only could stop by closing the IDE.
Created attachment 18684 [details] NetBeans log file
I changed the priority of this issue to P2, because i currently cannot work on with this version of NetBeans IDE, since each time i started the IDE the javadoc tab and it's corresponding javadoc task for the main project is present and active, and due to the bug described in this issue i'm not able to close the main project or do anything else than to close the IDE again.
Read Jan Chalupa's comments in issue #49249 how to workaround this. *** This issue has been marked as a duplicate of 49249 ***