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Hotfix for issue 174408 fixes deadlock, but still creates Swing components in background thread, so potential deadlock is still there - see http://hg.netbeans.org/main-golden/rev/d29a273d9541 Permanent fix should avoid creating components on a non EDT thread. See October 14, 2009 comments in issue 174408 for details.
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