为什么Windows 8上没有退出javaw.exe？

Question

I'm using Java 1.6.0_41 and I have a listener attached to when frames are about to close. System.exit(0) is successfully being called and the window for the application closes. However, in the Task Manager, javaw.exe is still running. Which thread is causing the block?

Update It looks like the awt.windows is still running and thus the shutdown hooks aren't finishing. Calling dispose() on Windows 8 prior to calling System.exit allows my app to close and the jvm to exit.

 2014-10-15 12:31:58
Full thread dump Java HotSpot(TM) 64-Bit Server VM (20.14-b01 mixed mode):

"RMI TCP Connection(2)-192.168.10.70" daemon prio=6 tid=0x00000000075a3000 nid=0x163c runnable [0x000000000a7df000]
   java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
- locked <0x00000007ac9dc9c0> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:66)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:517)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- <0x00000007ac778c70> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)

"JMX server connection timeout 84" daemon prio=6 tid=0x00000000075a4800 nid=0xd74 in Object.wait() [0x000000000a6df000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000007ac848288> (a [I)
at com.sun.jmx.remote.internal.ServerCommunicatorAdmin$Timeout.run(ServerCommunicatorAdmin.java:150)
- locked <0x00000007ac848288> (a [I)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"RMI Scheduler(0)" daemon prio=6 tid=0x00000000075a6000 nid=0xf9c waiting on condition [0x000000000a5df000]
   java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for  <0x00000007ac4abc20> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:609)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:602)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:957)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"RMI TCP Connection(1)-192.168.10.70" daemon prio=6 tid=0x00000000075a2000 nid=0xedc runnable [0x000000000a30f000]
   java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
- locked <0x00000007ac7d3670> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:66)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:517)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- <0x00000007ac7767c0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)

"RMI TCP Accept-0" daemon prio=6 tid=0x00000000075a1800 nid=0x378 runnable [0x000000000994f000]
   java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:408)
- locked <0x00000007ac4b5c38> (a java.net.SocksSocketImpl)
at java.net.ServerSocket.implAccept(ServerSocket.java:462)
at java.net.ServerSocket.accept(ServerSocket.java:430)
at sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:34)
at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:369)
at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:341)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"Thread-4" daemon prio=6 tid=0x00000000075a3800 nid=0x518 runnable [0x000000000bddf000]
   java.lang.Thread.State: RUNNABLE
at sun.awt.windows.WToolkit.shutdown(Native Method)
at sun.awt.windows.WToolkit.access$200(WToolkit.java:70)
at sun.awt.windows.WToolkit$2$1.run(WToolkit.java:278)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"Timer-1" daemon prio=6 tid=0x000000000e21e000 nid=0xbc in Object.wait() [0x000000001095f000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000007049a7bb0> (a java.util.TaskQueue)
at java.util.TimerThread.mainLoop(Timer.java:509)
- locked <0x00000007049a7bb0> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)

   Locked ownable synchronizers:
- None

"Timer-0" daemon prio=6 tid=0x000000000e219800 nid=0x1454 in Object.wait() [0x000000001085f000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000704ac9d30> (a java.util.TaskQueue)
at java.util.TimerThread.mainLoop(Timer.java:509)
- locked <0x0000000704ac9d30> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)

   Locked ownable synchronizers:
- None

"DestroyJavaVM" prio=6 tid=0x000000000e21b800 nid=0xba8 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"TimerQueue" daemon prio=6 tid=0x000000000e21c800 nid=0x1548 in Object.wait() [0x000000000facf000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000704827188> (a javax.swing.TimerQueue)
at javax.swing.TimerQueue.run(TimerQueue.java:232)
- locked <0x0000000704827188> (a javax.swing.TimerQueue)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"AWT-EventQueue-0" prio=6 tid=0x00000000089b8800 nid=0xd60 in Object.wait() [0x000000000bfdd000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000007045d60e0> (a java.lang.Thread)
at java.lang.Thread.join(Thread.java:1186)
- locked <0x00000007045d60e0> (a java.lang.Thread)
at java.lang.Thread.join(Thread.java:1239)
at java.lang.ApplicationShutdownHooks.runHooks(ApplicationShutdownHooks.java:79)
at java.lang.ApplicationShutdownHooks$1.run(ApplicationShutdownHooks.java:24)
at java.lang.Shutdown.runHooks(Shutdown.java:79)
at java.lang.Shutdown.sequence(Shutdown.java:123)
at java.lang.Shutdown.exit(Shutdown.java:168)
- locked <0x00000006fe24ca68> (a java.lang.Class for java.lang.Shutdown)
at java.lang.Runtime.exit(Runtime.java:90)
at java.lang.System.exit(System.java:904)
at com.hiddensoftware.hiddengui.HiddenFrame.attemptToExit(HiddenFrame.java:636)
at com.hiddensoftware.hiddengui.HiddenFrame.exit(HiddenFrame.java:620)
at com.hiddensoftware.hiddengui.HiddenFrame$14.windowClosing(HiddenFrame.java:2554)
at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:332)
at java.awt.Window.processWindowEvent(Window.java:1871)
at javax.swing.JFrame.processWindowEvent(JFrame.java:274)
at java.awt.Window.processEvent(Window.java:1829)
at java.awt.Component.dispatchEventImpl(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Window.dispatchEventImpl(Window.java:2489)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:674)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:633)
at java.awt.EventQueue$2.run(EventQueue.java:631)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:647)
at java.awt.EventQueue$3.run(EventQueue.java:645)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:644)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

   Locked ownable synchronizers:
- None

"AWT-Windows" daemon prio=6 tid=0x000000000857d800 nid=0xe74 runnable [0x0000000009d0f000]
   java.lang.Thread.State: RUNNABLE
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(WToolkit.java:293)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"AWT-Shutdown" prio=6 tid=0x000000000857c800 nid=0x28c in Object.wait() [0x0000000009c0f000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000704ae1ba8> (a java.lang.Object)
at java.lang.Object.wait(Object.java:485)
at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:265)
- locked <0x0000000704ae1ba8> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"Java2D Disposer" daemon prio=10 tid=0x00000000075b5000 nid=0x13d0 in Object.wait() [0x0000000009a4f000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000704906618> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x0000000704906618> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at sun.java2d.Disposer.run(Disposer.java:127)
at java.lang.Thread.run(Thread.java:662)

   Locked ownable synchronizers:
- None

"Low Memory Detector" daemon prio=6 tid=0x0000000007561800 nid=0xef4 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"C2 CompilerThread1" daemon prio=10 tid=0x00000000074f2800 nid=0x1474 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"C2 CompilerThread0" daemon prio=10 tid=0x00000000074f1000 nid=0x105c waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"JDWP Command Reader" daemon prio=6 tid=0x00000000021dd000 nid=0xc8c runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"JDWP Event Helper Thread" daemon prio=6 tid=0x00000000021d5800 nid=0xe38 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"JDWP Transport Listener: dt_socket" daemon prio=6 tid=0x00000000021d1800 nid=0x15d0 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"Attach Listener" daemon prio=10 tid=0x00000000021bf000 nid=0x16fc waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"Signal Dispatcher" daemon prio=10 tid=0x00000000021be000 nid=0x1010 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
- None

"Finalizer" daemon prio=8 tid=0x00000000021a4000 nid=0x1070 in Object.wait() [0x0000000006c5f000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000007044c0f68> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x00000007044c0f68> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

   Locked ownable synchronizers:
- None

"Reference Handler" daemon prio=10 tid=0x00000000021a0800 nid=0x12e4 in Object.wait() [0x0000000006b5f000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000007044c0f00> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <0x00000007044c0f00> (a java.lang.ref.Reference$Lock)

   Locked ownable synchronizers:
- None

"VM Thread" prio=10 tid=0x000000000219a800 nid=0x17ec runnable 

"GC task thread#0 (ParallelGC)" prio=6 tid=0x00000000020f6800 nid=0xfbc runnable 

"GC task thread#1 (ParallelGC)" prio=6 tid=0x00000000020f8800 nid=0xa18 runnable 

"GC task thread#2 (ParallelGC)" prio=6 tid=0x00000000020fa000 nid=0x1634 runnable 

"GC task thread#3 (ParallelGC)" prio=6 tid=0x00000000020fb800 nid=0x16c4 runnable 

"VM Periodic Task Thread" prio=10 tid=0x0000000007507000 nid=0x16b0 waiting on condition 

JNI global references: 16785

Answer 1

This was really simple...properly calling dispose() on UI components right before calling System.exit(0) solves my issue. It seems that relying on System.exit(0) on Windows 7 to close your resources works, but on Windows 8 it doesn't. If you look at the thread dump, you can see that awt.windows has a thread that is still running during the shutdown phase on the edt and thus the edt can't quit.