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Workspace environment: "folder-of-projects" group, 55 mvn2 projects, a couple of pom.xmls and "Start Page" opened. Starting the IDE, I clicked a few "system slowness" messages, played around a little with a database connector (SAP MaxDB) and then tried to navigate into some maven2 project - just to see the IDE lock up. Thread dump attached, heap dump available (though a little large...). It is somewhat reproducible as it happened earlier several times using this build (i.e. having the IDE started, being somewhere in the office dealing with other things and then being back to the desktop trying to browse projects). Not sure what's causing it... Build used: netbeans-trunk-nightly-200907270201-java.zip
Created attachment 85276 [details] thread dump
At the firt sight looks like locked in apisupport - reassigning for evaluation.
Well, I don't understand why is default RP thread waiting for mutex of which it is the sole owner, but this seems to be caused by fix of issue #168874. Jardo, please evaluate, otherwise I'll revert main #c759aee432d6, as this seems to be more serious than #168874.
*** This issue has been marked as a duplicate of 169448 ***