Created attachment 122069 [details]
Occurred in 7.2 RC1 while installing JIRA plugin via button in "Create Issue Tracker" dialog. Some (all?) required modules were installed according to status messages in main window, then IDE froze.
Integrated into 'main-golden', will be available in build *201211211016* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Jaroslav Tulach <email@example.com>
Log: #215596: Deadlock between NetigsoHandle and SystemClassLoader
#215596: Giving the "framework" field different lock than the rest of the other data structures here-in
*** Bug 222494 has been marked as a duplicate of this bug. ***