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This bug was originally marked as duplicate of bug 181855, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build nbms-and-javadoc-5097-on-100418) VM: Java HotSpot(TM) Server VM, 16.2-b04, Java(TM) SE Runtime Environment, 1.6.0_19-b04 OS: Windows XP User Comments: mklaehn: reopening closed project Stacktrace: java.lang.IllegalStateException: Should not acquire Children.MUTEX while holding ProjectManager.mutex() at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1828) at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1323) at org.openide.util.Mutex.readAccess(Mutex.java:351) at org.openide.explorer.view.VisualizerNode$QP.run(VisualizerNode.java:682) at org.openide.util.Mutex.doEvent(Mutex.java:1338) at org.openide.util.Mutex.writeAccess(Mutex.java:452)
Created attachment 98158 [details] stacktrace
Right module, incorrect diagnosis. Anyway already fixed in dev sources. (Reporter: beware that if you update random modules from the alpha dev update center, you are not getting all or even most bug fixes made in development builds.) *** This bug has been marked as a duplicate of bug 184501 ***