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This was using NB 5.0 Beta 2 build. I had two NB modules open (sunddui and sunddapi under serverplugins/sun), had their respective build.xml files open and was cutting and pasting some build targets between the build.xml files when I received this deadlock. I restarted the IDE w/ console window, tried to continue my editing (since I'd lost the first round) and deadlocked again. Trace from second deadlock attached.
Created attachment 27174 [details] Deadlock thread dump.
Seems like duplicate of issue #68650 to me.
*** This issue has been marked as a duplicate of 68650 ***
verified duplicate