Java Swing：冻结的GUI-jstack解释

Question

我有一个Gui应用程序，它可以在串行热敏打印机上打印票证。当我点击启动此操作的按钮时，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来确定，但是我不明白下面的结果：

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

有人可以告诉我在哪里可以看到我的GUI由于第一个线程“ Thread-12”而被冻结。

其次，只要我确定我只运行过一次该线程，“ Thread-6”和“ Thread-7”之间有什么区别。

Answer 1

AWT-EventQueue-0是您的事件分配线程，确实阻止了它 通过 RXTX 套接字通过套接字从 串行端口
读取hsqldb。您应该使用SwingWorker@Kumar建议的。在这里和这里都可以找到示例。我发现在探查器中研究此类示例很有帮助。

Thread-6并且Thread-7似乎属于您的应用程序的实例Threads.ThreadHorloge在posO2。关于线程名称：

每个线程都有一个名称供识别。一个以上的线程可能具有相同的名称。如果在创建线程时未指定名称，则会为其生成一个新名称。

请注意，SwingWorker与Executors通常包括文字 池-N ，其中 ñ 是一个序列号。

附录： 我的EDT处于一种 RUNNABLE 状态，因此从我粘贴的代码中，您可以确定它已被阻止； 您在哪里发现通过RXTX读取是阻塞原因？

抱歉，是我的错;
已更正。EDT并不是BLOCKED在Thread.STATE等待监视器锁定。从某种意义上说，它在等待数据库响应的过程中被阻塞，至少要足够长的时间，以便在您发送-QUIT信号时在调用堆栈的顶部被看到。EDT上不应安排串行或网络操作。