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Java Swing：图形用户界面冻结 - jstack解释

2012-10-04 35 views
4

我有一个摇动的Gui应用程序，它在串行热敏打印机上打印票据。当我点击启动这个动作的按钮时，我的GUI被冻结。我认为这是因为代码是在EDT上执行的。我用jstack可以肯定的，但我不明白下面的结果：Java Swing：图形用户界面冻结 - jstack解释

Full thread dump Java HotSpot(TM) Client VM (23.3-b01 mixed mode, sharing): 

"Thread-12" prio=6 tid=0x03012000 nid=0xd04 runnable [0x038ef000] 
java.lang.Thread.State: RUNNABLE 
    at gnu.io.RXTXPort.eventLoop(Native Method) 
    at gnu.io.RXTXPort$MonitorThread.run(RXTXPort.java:1575) 

"Thread-6" prio=6 tid=0x0302c400 nid=0x1b0 waiting on condition [0x039ef000] 
java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at posO2.Threads.ThreadHorloge.run(ThreadHorloge.java:46) 

"Thread-5" prio=6 tid=0x03511c00 nid=0x9e4 waiting on condition [0x0399f000] 
java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at posO2.Threads.ThreadIgor.run(ThreadIgor.java:29) 

"Thread-7" prio=6 tid=0x034b9800 nid=0xb40 waiting on condition [0x0394f000] 
java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at posO2.Threads.ThreadHorloge.run(ThreadHorloge.java:46) 
    at java.lang.Thread.run(Unknown Source) 

"Thread-4" prio=6 tid=0x0318ec00 nid=0xa08 waiting on condition [0x0323f000] 
java.lang.Thread.State: TIMED_WAITING (sleeping) 
    at java.lang.Thread.sleep(Native Method) 
    at posO2.Threads.ThreadMajProduits.run(ThreadMajProduits.java:49) 

"TimerQueue" daemon prio=6 tid=0x03036400 nid=0x9b8 waiting on condition [0x0344 
f000] 
java.lang.Thread.State: WAITING (parking) 
    at sun.misc.Unsafe.park(Native Method) 
    - parking to wait for <0x27e76778> (a java.util.concurrent.locks.Abstra 
ctQueuedSynchronizer$ConditionObject) 
    at java.util.concurrent.locks.LockSupport.park(Unknown Source) 
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject 
.await(Unknown Source) 
    at java.util.concurrent.DelayQueue.take(Unknown Source) 
    at javax.swing.TimerQueue.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

"DestroyJavaVM" prio=6 tid=0x003c8400 nid=0xfe4 waiting on condition [0x00000000 
] 
java.lang.Thread.State: RUNNABLE 

"AWT-EventQueue-0" prio=6 tid=0x02b6e000 nid=0xcbc runnable [0x033fe000] 
java.lang.Thread.State: RUNNABLE 
    at java.net.SocketInputStream.socketRead0(Native Method) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.net.SocketInputStream.read(Unknown Source) 
    at java.io.BufferedInputStream.fill(Unknown Source) 
    at java.io.BufferedInputStream.read(Unknown Source) 
    - locked <0x22f33f30> (a java.io.BufferedInputStream) 
    at java.io.DataInputStream.readByte(Unknown Source) 
    at org.hsqldb.result.Result.newResult(Unknown Source) 
    at org.hsqldb.ClientConnection.read(Unknown Source) 
    at org.hsqldb.ClientConnection.execute(Unknown Source) 
    - locked <0x22f32700> (a org.hsqldb.ClientConnection) 
    at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source) 
    at org.hsqldb.jdbc.JDBCStatement.executeQuery(Unknown Source) 
    - locked <0x22be23b0> (a org.hsqldb.jdbc.JDBCStatement) 
    at posO2.Printer.flash(Printer.java:1058) 
    at posO2.Printer.bigFlash(Printer.java:1111) 
    at posO2.Panels.Accueil$5.actionPerformed(Accueil.java:314) 
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) 
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) 
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) 
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source) 
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) 
    at java.awt.Component.processMouseEvent(Unknown Source) 
    at javax.swing.JComponent.processMouseEvent(Unknown Source) 
    at java.awt.Component.processEvent(Unknown Source) 
    at java.awt.Container.processEvent(Unknown Source) 
    at java.awt.Component.dispatchEventImpl(Unknown Source) 
    at java.awt.Container.dispatchEventImpl(Unknown Source) 
    at java.awt.Component.dispatchEvent(Unknown Source) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) 
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) 
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) 
    at java.awt.Container.dispatchEventImpl(Unknown Source) 
    at java.awt.Window.dispatchEventImpl(Unknown Source) 
    at java.awt.Component.dispatchEvent(Unknown Source) 
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
    at java.awt.EventQueue.access$200(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue$4.run(Unknown Source) 
    at java.awt.EventQueue$4.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue.dispatchEvent(Unknown Source) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.run(Unknown Source) 

"AWT-Shutdown" prio=6 tid=0x02b81800 nid=0xefc in Object.wait() [0x033af000] 
java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x27c707c0> (a java.lang.Object) 
    at java.lang.Object.wait(Object.java:503) 
    at sun.awt.AWTAutoShutdown.run(Unknown Source) 
    - locked <0x27c707c0> (a java.lang.Object) 
    at java.lang.Thread.run(Unknown Source) 

"AWT-Windows" daemon prio=6 tid=0x03002800 nid=0xe58 runnable [0x0328f000] 
java.lang.Thread.State: RUNNABLE 
    at sun.awt.windows.WToolkit.eventLoop(Native Method) 
    at sun.awt.windows.WToolkit.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

"Java2D Disposer" daemon prio=10 tid=0x03000400 nid=0x4d0 in Object.wait() [0x03 
1ef000] 
java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x27c2bf18> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(Unknown Source) 
    - locked <0x27c2bf18> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(Unknown Source) 
    at sun.java2d.Disposer.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

"Service Thread" daemon prio=6 tid=0x02b63000 nid=0xb94 runnable [0x00000000] 
java.lang.Thread.State: RUNNABLE 

"C1 CompilerThread0" daemon prio=10 tid=0x02b54c00 nid=0x3f0 waiting on conditio 
n [0x00000000] 
java.lang.Thread.State: RUNNABLE 

"Attach Listener" daemon prio=10 tid=0x02b53400 nid=0x924 waiting on condition [ 
0x00000000] 
java.lang.Thread.State: RUNNABLE 

"Signal Dispatcher" daemon prio=10 tid=0x02b52000 nid=0xb88 runnable [0x00000000 
] 
java.lang.Thread.State: RUNNABLE 

"Finalizer" daemon prio=8 tid=0x02b43c00 nid=0xfc8 in Object.wait() [0x02dff000] 

java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x27c2c148> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(Unknown Source) 
    - locked <0x27c2c148> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(Unknown Source) 
    at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source) 

"Reference Handler" daemon prio=10 tid=0x02b3f000 nid=0x488 in Object.wait() [0x 
02daf000] 
java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x27c2bdd8> (a java.lang.ref.Reference$Lock) 
    at java.lang.Object.wait(Object.java:503) 
    at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source) 
    - locked <0x27c2bdd8> (a java.lang.ref.Reference$Lock) 

"VM Thread" prio=10 tid=0x02b3d400 nid=0xa6c runnable 

"VM Periodic Task Thread" prio=10 tid=0x02b76800 nid=0xf30 waiting on condition 


JNI global references: 426

有人能向我解释，在那里我可以看到我的GUI是因为第一个线程“主题-12”的冻结。

第二，“线程-6”和“线程-7”之间有什么区别，只要我确信我只运行一次线程。

来源

2012-10-04 caRameL

+0

打印呼叫是否被阻止？如果是阻塞呼叫，只需将其委托给不同的线程。 – Shark

回答

6

AWT-EventQueue-0是你的事件调度线程，它确实被阻止通过hsqldb从 串口通过 RXTX 一个socket读取。按照@Kumar的建议，您应该使用SwingWorker。例子可以发现here和here。我发现在profiler中研究这些例子是有帮助的。

Thread-6和Thread-7作为Threads.ThreadHorloge的实例在posO2中似乎属于您的应用程序。关于线名：

每个thread都有一个名称用于识别目的。多个线程可能具有相同的名称。如果在创建线程时未指定名称，则会为其生成新名称。

注意SwingWorker和Executors通常包括文本池-N，其中ñ是序列号。

附录：我EDT处于RUNNABLE状态，所以从我粘贴代码，你在哪里弄清楚，它的堵塞;并且您在哪里发现通过RXTX的读数是阻塞原因？

对不起，我的错误;上面的修正。 EDT不是BLOCKED中的Thread.STATE等待显示器锁定的意义;它在等待数据库响应的意义上被阻塞，至少足够长时间在发送-QUIT信号时可以在调用堆栈上看到。应该在EDT上安排串行和网络操作。

来源

2012-10-04 16:34:02 trashgod

+0

中构建好了，但是它表示我的EDT处于可运行状态，所以从我粘贴的代码中，您发现它的位置已被阻止，您在哪里发现通过RXTX读取是阻塞原因？ – caRameL

5

一个非常基本的规则：

  • 保持UI线程上的用户界面的工作，非UI线程上的非UI工作。

这样我们就可以保持GUI 互动和响应。

  • 在Java 事件调度线程（EDT）是UI线程，在Java GUI应用程序main()方法没有长期居住，所以调度GUI建设工作在事件调度队列后退出然后它是处理GUI的EDT。

  • 要么使用Thread做长的非UI处理工作，或使用SwingWorker，这在java做的UI和非UI工作之间的无缝同步提供......

来源

2012-10-04 13:49:09

3

这线程是真实从事件队列

“AWT-EventQueue的-0” PRIO = 6 TID = 0x02b6e000 NID = 0xcbc可运行 [0x033fe000] java.lang.Thread.State中启动的一个：RUNNABLE

你可以告诉，因为在这个胎面的堆栈跟踪的尽头，它是由EventDispatchThread开始：

在java.awt.EventDispatchThread.run（来源不明）

至于你关于“线程6和线程7有什么区别”的问题，我没有直接的答案，但我认为大多数这些线程都是由你的分析器创建的（因此，重新看到它是旋转起来的线程）。虽然这可能是错误的。我无法找到它正在引用的Threads.ThreadHorloge类中的任何内容。

来源

2012-10-04 13:53:15

+0

+1我认为这些名字默认在'Thread' – trashgod

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