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While working locally, I can see a lot of warning messages in the console that says NOT to use atomicLock() and unlock() APIs in BaseDocument.
Integrated into 'main-golden', available in build *200808280201* on http://bits.netbeans.org/dev/nightly/ Changeset: http://hg.netbeans.org/main/rev/039b58a92d91 User: samaresh@netbeans.org Log: #145072 do not use BaseDocument's atomicLock
Has been fixed.