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When Clearcase is unavailable, the IDE locks-up and the process must be killed. In our case, the license server is down which is causing clearcase not to work in general. The result is the IDE freezing.
please provide a thread dump - http://wiki.netbeans.org/GenerateThreadDump thanks
Created attachment 127807 [details] Thread Dump NB 7.2 Thread dump
fixed in core-main #9123606128e9
Integrated into 'main-golden', will be available in build *201211211016* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/9123606128e9 User: Tomas Stupka <tstupka@netbeans.org> Log: Issue #222111 - Clearcase License Server Unavailable Freezes NetBeans