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I just encountered the following deadlock when I clicked on the Tools menu immediately after opening NetBeans. The status bar said "opening main window" at the time. Deadlock: AWT-EventQueue-1 is waiting to lock sun.awt.PostEventQueue@640aec9a which is held by TimerQueue TimerQueue is waiting to lock java.util.concurrent.locks.ReentrantLock$NonfairSync@374e582 which is held by AWT-EventQueue-1 Deadlock: TimerQueue is waiting to lock java.util.concurrent.locks.ReentrantLock$NonfairSync@374e582 which is held by AWT-EventQueue-1 AWT-EventQueue-1 is waiting to lock sun.awt.PostEventQueue@640aec9a which is held by TimerQueue Thread stacks AWT-EventQueue-1 [BLOCKED; waiting to lock sun.awt.PostEventQueue@640aec9a] sun.awt.PostEventQueue.noEvents(SunToolkit.java:2001) sun.awt.SunToolkit.isPostEventQueueEmpty(SunToolkit.java:526) java.awt.EventQueue.detachDispatchThread(EventQueue.java:1068) java.awt.EventDispatchThread.run(EventDispatchThread.java:103) TimerQueue [WAITING] sun.misc.Unsafe.park(native method) java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834) java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867) java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197) java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214) java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290) java.awt.EventQueue.postEventPrivate(EventQueue.java:247) java.awt.EventQueue.postEvent(EventQueue.java:233) sun.awt.PostEventQueue.flush(SunToolkit.java:2013) sun.awt.SunToolkit.flushPendingEvents(SunToolkit.java:512) java.awt.EventQueue.postEvent(EventQueue.java:232) java.awt.EventQueue.invokeLater(EventQueue.java:1208) javax.swing.SwingUtilities.invokeLater(SwingUtilities.java:1290) javax.swing.Timer$1.run(Timer.java:613) javax.swing.Timer$1.run(Timer.java:611) java.security.AccessController.doPrivileged(native method) javax.swing.Timer.post(Timer.java:611) javax.swing.TimerQueue.run(TimerQueue.java:181) java.lang.Thread.run(Thread.java:722)
*** This bug has been marked as a duplicate of bug 213926 ***