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dev build 200809180201 Tools | Options | Editor -> deadlock occurred. This occurs randomly. Fortunately I managed to catch a thread-dump that shows the deadlock (jstack is great!)
Created attachment 70342 [details] the thread dump
Reassigning to editor for evaluation.
Looks familiar...
http://hg.netbeans.org/main/rev/68399fdf46fe
Integrated into 'main-golden', will be available in build *200809250201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/68399fdf46fe User: Vita Stejskal <vstejskal@netbeans.org> Log: #148070: use KitsTracker to prevent accessing MimePath's lookup from inside its construction