dalStrategy.java:86)
        at sun.awt.X11.XTransientForModality.setModal(XTransientForModality.java:35)
        at sun.awt.X11.XMWMModality.setModal(XMWMModality.java:72)
        at sun.awt.X11.XNETProtocol.setModal(XNETProtocol.java:207)
        at sun.awt.X11.XDialogPeer.handleMapNotifyEvent(XDialogPeer.java:87)
        at sun.awt.X11.XBaseWindow.dispatchEvent(XBaseWindow.java:813)
        at sun.awt.X11.XWindowPeer.dispatchEvent(XWindowPeer.java:437)
        at sun.awt.X11.XBaseWindow.dispatchToWindow(XBaseWindow.java:766)
        at sun.awt.X11.XToolkit.dispatchEvent(XToolkit.java:394)
        at sun.awt.X11.XToolkit.run(XToolkit.java:493)
        at sun.awt.X11.XToolkit.run(XToolkit.java:438)
        at java.lang.Thread.run(Thread.java:570)
 
Found 1 deadlock.
 

###@###.### 2004-03-02

J2SE Version (please include all output from java -version flag):
  java version "1.5.0-beta2"
  Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b40)
  Java HotSpot(TM) Client VM (build 1.5.0-beta2-b40, mixed mode)

Does this problem occur on J2SE 1.3.x or 1.4.x? Yes / No (pick one)
  No. works fine with 1.4.2_03.

Operating System Configuration Information (be specific):
  Debian Linux SID, XFree 4.3.0, Kernel 2.4 and Kernel 2.6

Hardware Configuration Information (be specific):
  Dell Inspiron 8500 with 1GB RAM.

Bug Description:
  When more than one modal dialogs are opened there is a chance that an
  AWT deadlock occurs. The attached program repeatedly displays up to 10
  modal dialogs and closes them again. This program the deadlock after a
  short while.

  With JDK 1.4.2_03 no deadlock occurs.

  This is critical because it causes the application to hang. No
  any potential workaround.


Steps to Reproduce (be specific):
  Run the attached Java program(DialogDeadlockTest.java)
  until it hangs (deadlocks). Capturing a thread dump yields
  stacktraces and a deadlock.

Thread dump and stacktraces info:
----------------------------------
hans@gna:~/CodeGuideProjects/DialogDeadlockTest$ /opt/java/j2sdk1.5.0/bin/java DialogDeadlockTest
Full thread dump Java HotSpot(TM) Client VM (1.5.0-beta2-b40 mixed mode):
 
"DestroyJavaVM" prio=1 tid=0x0805ab68 nid=0x48c waiting on condition [0x00000000..0xbfffd5f0]
 
"AWT-EventQueue-0" prio=1 tid=0x0817a4c0 nid=0x49a waiting for monitor entry
[0xbe1fe000..0xbe1ff4f4]
        at sun.awt.X11.XComponentPeer.restack(XComponentPeer.java:1364)
        - waiting to lock <0x52031158> (a java.lang.Class)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Component.addNotify(Component.java:5873)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Container.addNotify(Container.java:2486)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at javax.swing.JComponent.addNotify(JComponent.java:4407)
        at javax.swing.JRootPane.addNotify(JRootPane.java:676)
        at java.awt.Container.addNotify(Container.java:2493)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Window.addNotify(Window.java:458)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Dialog.addNotify(Dialog.java:376)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Window.pack(Window.java:476)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:37)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at
java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
 
"AWT-Shutdown" prio=1 tid=0x08159f78 nid=0x498 in Object.wait() [0xbe3ff000..0xbe3ff574]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x49c7e1d0> (a java.lang.Object)
        at java.lang.Object.wait(Object.java:474)
        at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:259)
        - locked <0x49c7e1d0> (a java.lang.Object)
        at java.lang.Thread.run(Thread.java:570)
 
"AWT-XAWT" daemon prio=1 tid=0x08154378 nid=0x497 waiting for monitor entry
[0xbe5ff000..0xbe5ff5f4]
        at sun.awt.X11.XWindow.isParentOf(XWindow.java:241)
        - waiting to lock <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at
sun.awt.X11.XModalStrategy$XApplicationModalityTreeUnsensetive.modalityStarts(XModalStrategy.java:86)
        at sun.awt.X11.XTransientForModality.setModal(XTransientForModality.java:35)
        at sun.awt.X11.XMWMModality.setModal(XMWMModality.java:72)
        at sun.awt.X11.XNETProtocol.setModal(XNETProtocol.java:207)
        at sun.awt.X11.XDialogPeer.handleMapNotifyEvent(XDialogPeer.java:87)
        at sun.awt.X11.XBaseWindow.dispatchEvent(XBaseWindow.java:813)
        at sun.awt.X11.XWindowPeer.dispatchEvent(XWindowPeer.java:437)
        at sun.awt.X11.XBaseWindow.dispatchToWindow(XBaseWindow.java:766)
        at sun.awt.X11.XToolkit.dispatchEvent(XToolkit.java:394)
        at sun.awt.X11.XToolkit.run(XToolkit.java:493)
        at sun.awt.X11.XToolkit.run(XToolkit.java:438)
        at java.lang.Thread.run(Thread.java:570)
 
"Java2D Disposer" daemon prio=1 tid=0x08141338 nid=0x496 in Object.wait() [0xbe7ff000..0xbe7ff674]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x49c7e290> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
        - locked <0x49c7e290> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
        at sun.java2d.Disposer.run(Disposer.java:107)
        at java.lang.Thread.run(Thread.java:570)
 
"CG Debugger Proxy" daemon prio=1 tid=0x0812ee10 nid=0x495 waiting on condition
[0xbe9ff000..0xbe9ff6f4]
        at java.lang.Thread.sleep(Native Method)
        at DebuggerRT$ProxyThread.run(DebuggerRT.java:1435)
 
"Low Memory Detector" daemon prio=1 tid=0x080a0e60 nid=0x493 runnable [0x00000000..0x00000000]
 
"CompilerThread0" daemon prio=1 tid=0x0809f960 nid=0x492 waiting on condition
[0x00000000..0xbefff25c]
 
"Signal Dispatcher" daemon prio=1 tid=0x0809e958 nid=0x491 waiting on condition
[0x00000000..0x00000000]
 
"Finalizer" daemon prio=1 tid=0x0809a520 nid=0x490 in Object.wait() [0xbf3ff000..0xbf3ff574]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x49c7e498> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
        - locked <0x49c7e498> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
 
"Reference Handler" daemon prio=1 tid=0x080997d8 nid=0x48f in Object.wait()
[0xbf5ff000..0xbf5ff5f4]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x49c7e518> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:474)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:117)
        - locked <0x49c7e518> (a java.lang.ref.Reference$Lock)
 
"VM Thread" prio=1 tid=0x08095008 nid=0x48e runnable
 
"VM Periodic Task Thread" prio=1 tid=0x080a22d0 nid=0x494 waiting on condition
 
 
Found one Java-level deadlock:
=============================
"AWT-EventQueue-0":
  waiting to lock monitor 0x0809b424 (object 0x52031158, a java.lang.Class),
  which is held by "AWT-XAWT"
"AWT-XAWT":
  waiting to lock monitor 0x0809b524 (object 0x49c7e590, a java.awt.Component$AWTTreeLock),
  which is held by "AWT-EventQueue-0"
 
Java stack information for the threads listed above:
===================================================
"AWT-EventQueue-0":
        at sun.awt.X11.XComponentPeer.restack(XComponentPeer.java:1364)
        - waiting to lock <0x52031158> (a java.lang.Class)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Component.addNotify(Component.java:5873)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Container.addNotify(Container.java:2486)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at javax.swing.JComponent.addNotify(JComponent.java:4407)
        at javax.swing.JRootPane.addNotify(JRootPane.java:676)
        at java.awt.Container.addNotify(Container.java:2493)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Window.addNotify(Window.java:458)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Dialog.addNotify(Dialog.java:376)
        - locked <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at java.awt.Window.pack(Window.java:476)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:37)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:514)
        at java.awt.Dialog.show(Dialog.java:535)
        at DialogDeadlockTest$1.run(DialogDeadlockTest.java:40)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at
java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
"AWT-XAWT":
        at sun.awt.X11.XWindow.isParentOf(XWindow.java:241)
        - waiting to lock <0x49c7e590> (a java.awt.Component$AWTTreeLock)
        at
sun.awt.X11.XModalStrategy$XApplicationModalityTreeUnsensetive.modalityStarts(XMo