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Applets Java Discussion :

Applet Swing - freeze aléatoire navigateur + JVM


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Applets Java

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  1. #1
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    Par défaut Applet Swing - freeze aléatoire navigateur + JVM
    Bonjour,

    J'ai une applet avec une interface utilisateur assez simple (trois barres de défilement, trois boutons, six labels). Lors de son démarrage, l'applet demande la sélection d'un répertoire avec un JFileChooser en mode "répertoires seulement", puis le traitement démarre et on peut suivre sa progression sur les barres. J'ai légèrement bidouillé le JFileChooser pour enlever la boite de sélection de type de fichiers, qui ne sert à rien dans notre cas.

    Tout marche bien.

    Sauf que, de temps en temps, lors du lancement de l'applet, la JVM freeze complètement; la seule solution reste de tuer le navigateur. Lorsque ça freeze, l'applet n'est pas affichée du tout (la page reste juste blanche).

    Nous n'avons pas pu identifier de scénario de reproduction, ça "arrive juste de temps en temps". Parfois c'est systématique à chaque lancement jusqu'à ce qu'on en ait marre, parfois ça marche pendant trois jours...

    Lors du freeze, impossible d'afficher la console Java. J'ai donc passé l'option -verbose au plugin Java; il me sort bien la fenêtre de traçage, lors du crash je peux faire un Ctrl+Break pour faire un thread dump, mais impossible d'y accéder pour faire un copy/paste (comprenne qui peut).

    La seule chose que j'ai pu faire, c'est deux captures d'écran que je vous mets en fichier attachés.(Désolé de vous poster ça sous cette forme, pas trop le choix)

    Je suppose que mon problème vient des threads qui attendent en état "Blocked"; la grande question c'est pourquoi passent-ils dans cet état, et surtout pourquoi est-ce aléatoire... (ça ressemble à un vieil interlock qui sort du bois, non ?)

    Merci de toute suggestion pouvant m'aider à tracer, identifier et solutionner ce problème.
    Images attachées Images attachées   

  2. #2
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    Par défaut Précisions
    Un autre plantage, un peu plus loin : cette fois l'applet s'affiche, mais pas le JFileChooser. Et pour le coup, je peux sélectionner dans la console de debug JVM. Voici son contenu :
    Code : Sélectionner tout - Visualiser dans une fenêtre à part
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    "Swing-Shell" daemon prio=4 tid=0x0b892400 nid=0x14e4 waiting for monitor entry
    [0x0cdff000..0x0cdffc14]
       java.lang.Thread.State: BLOCKED (on object monitor)
            at sun.awt.shell.Win32ShellFolder2.isFileSystem(Unknown Source)
            - waiting to lock <0x20a13ea8> (a sun.awt.shell.Win32ShellFolder2)
            at sun.awt.shell.Win32ShellFolder2.equals(Unknown Source)
            at java.util.AbstractList.equals(Unknown Source)
            at java.util.Vector.equals(Unknown Source)
            - locked <0x20a538b0> (a java.util.Vector)
            at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(Unk
    nown Source)
            at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(Unk
    nown Source)
            at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
            at java.util.concurrent.FutureTask.run(Unknown Source)
            at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
    )
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
            at sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Unknown Sourc
    e)
            at java.lang.Thread.run(Unknown Source)
    
    "Applet-Main" prio=4 tid=0x0b86b400 nid=0x14f4 waiting on condition [0x0c43f000.
    .0x0c43fc94]
       java.lang.Thread.State: WAITING (parking)
            at sun.misc.Unsafe.park(Native Method)
            - parking to wait for  <0x20a248e0> (a java.util.concurrent.FutureTask$S
    ync)
            at java.util.concurrent.locks.LockSupport.park(Unknown Source)
            at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInt
    errupt(Unknown Source)
            at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared
    Interruptibly(Unknown Source)
            at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedIn
    terruptibly(Unknown Source)
            at java.util.concurrent.FutureTask$Sync.innerGet(Unknown Source)
            at java.util.concurrent.FutureTask.get(Unknown Source)
            at sun.awt.shell.Win32ShellFolderManager2$ComInvoker.invoke(Unknown Sour
    ce)
            at sun.awt.shell.Win32ShellFolder2.hasAttribute(Unknown Source)
            at sun.awt.shell.Win32ShellFolder2.isLink(Unknown Source)
            - locked <0x20a13ea8> (a sun.awt.shell.Win32ShellFolder2)
            at javax.swing.filechooser.FileSystemView.isFileSystem(Unknown Source)
            at javax.swing.filechooser.FileSystemView.getSystemDisplayName(Unknown S
    ource)
            at javax.swing.plaf.basic.BasicFileChooserUI$BasicFileView.getName(Unkno
    wn Source)
            at javax.swing.JFileChooser.getName(Unknown Source)
            at sun.swing.FilePane$FileRenderer.getListCellRendererComponent(Unknown
    Source)
            at javax.swing.plaf.basic.BasicListUI.updateLayoutState(Unknown Source)
            at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(Unknown Sou
    rce)
            at javax.swing.plaf.basic.BasicListUI.getPreferredSize(Unknown Source)
            at javax.swing.JComponent.getPreferredSize(Unknown Source)
            at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)
            at java.awt.Container.layout(Unknown Source)
            at java.awt.Container.doLayout(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validateTree(Unknown Source)
            at java.awt.Container.validate(Unknown Source)
            - locked <0x2112c210> (a java.awt.Component$AWTTreeLock)
            at java.awt.Dialog.conditionalShow(Unknown Source)
            - locked <0x2112c210> (a java.awt.Component$AWTTreeLock)
            at java.awt.Dialog.show(Unknown Source)
            at javax.swing.JFileChooser.showDialog(Unknown Source)
            at packagename.ImageSubmitApplet.run(Unknown Source)
            at java.lang.Thread.run(Unknown Source)
    
    "TimerQueue" daemon prio=4 tid=0x0b9d6400 nid=0x100c in Object.wait() [0x0bf3f00
    0..0x0bf3fa14]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x213c3370> (a javax.swing.TimerQueue)
            at javax.swing.TimerQueue.run(Unknown Source)
            - locked <0x213c3370> (a javax.swing.TimerQueue)
            at java.lang.Thread.run(Unknown Source)
    
    "TimerQueue" daemon prio=6 tid=0x0c990800 nid=0x6f4 in Object.wait() [0x0d50f000
    ..0x0d50fa94]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x213a4d48> (a javax.swing.TimerQueue)
            at javax.swing.TimerQueue.run(Unknown Source)
            - locked <0x213a4d48> (a javax.swing.TimerQueue)
            at java.lang.Thread.run(Unknown Source)
    
    "AWT-EventQueue-1" prio=6 tid=0x0c976400 nid=0x1530 in Object.wait() [0x0d2ff000
    ..0x0d2ffb14]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x2115dbb0> (a java.awt.EventQueue)
            at java.lang.Object.wait(Object.java:485)
            at java.awt.EventQueue.getNextEvent(Unknown Source)
            - locked <0x2115dbb0> (a java.awt.EventQueue)
            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-EventQueue-0" prio=6 tid=0x0b9de000 nid=0xda4 in Object.wait() [0x0c53f000.
    .0x0c53fb94]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x2110c930> (a java.awt.EventQueue)
            at java.lang.Object.wait(Object.java:485)
            at java.awt.EventQueue.getNextEvent(Unknown Source)
            - locked <0x2110c930> (a java.awt.EventQueue)
            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)
    
    "Applet-UI" prio=4 tid=0x0ba09800 nid=0x1080 in Object.wait() [0x0c23f000..0x0c2
    3fd14]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x2115cc48> (a sun.plugin.AppletViewer)
            at java.lang.Object.wait(Object.java:485)
            at sun.applet.AppletPanel.getNextEvent(Unknown Source)
            - locked <0x2115cc48> (a sun.plugin.AppletViewer)
            at sun.applet.AppletPanel.run(Unknown Source)
            at java.lang.Thread.run(Unknown Source)
    
    "AWT-EventQueue-2" prio=4 tid=0x0b95dc00 nid=0x868 waiting for monitor entry [0x
    0c03f000..0x0c03fa14]
       java.lang.Thread.State: BLOCKED (on object monitor)
            at sun.awt.im.InputContext.focusLost(Unknown Source)
            - waiting to lock <0x2112c210> (a java.awt.Component$AWTTreeLock)
            at sun.awt.im.InputContext.dispatchEvent(Unknown Source)
            at sun.awt.im.InputMethodContext.dispatchEvent(Unknown Source)
            at java.awt.Component.dispatchEventImpl(Unknown Source)
            at java.awt.Container.dispatchEventImpl(Unknown Source)
            at java.awt.Component.dispatchEvent(Unknown Source)
            at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
            at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Sour
    ce)
            at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
            at java.awt.Component.dispatchEventImpl(Unknown Source)
            at java.awt.Container.dispatchEventImpl(Unknown Source)
            at java.awt.Component.dispatchEvent(Unknown Source)
            at java.awt.EventQueue.dispatchEvent(Unknown Source)
            at java.awt.SentEvent.dispatch(Unknown Source)
            at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentE
    vent.dispatch(Unknown Source)
            at java.awt.DefaultKeyboardFocusManager.sendMessage(Unknown Source)
            at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
            at java.awt.Component.dispatchEventImpl(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.dispatchEvent(Unknown Source)
            at java.awt.SequencedEvent.dispatch(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)
    
    "CacheCleanUpThread" daemon prio=6 tid=0x0b848c00 nid=0x11f4 in Object.wait() [0
    x0bc3f000..0x0bc3fd14]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x2115d040> (a com.sun.deploy.cache.CleanupThread)
            at java.lang.Object.wait(Object.java:485)
            at com.sun.deploy.cache.CleanupThread.run(Unknown Source)
            - locked <0x2115d040> (a com.sun.deploy.cache.CleanupThread)
    
    "CacheMemoryCleanUpThread" prio=6 tid=0x0aaf4c00 nid=0x1350 in Object.wait() [0x
    0bb3f000..0x0bb3fd94]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x211230e8> (a java.lang.ref.ReferenceQueue$Lock)
            at java.lang.ref.ReferenceQueue.remove(Unknown Source)
            - locked <0x211230e8> (a java.lang.ref.ReferenceQueue$Lock)
            at java.lang.ref.ReferenceQueue.remove(Unknown Source)
            at com.sun.deploy.cache.MemoryCache$LoadedResourceCleanupThread.run(Unkn
    own Source)
    
    "traceMsgQueueThread" daemon prio=6 tid=0x0aaf8c00 nid=0x170 in Object.wait() [0
    x0b83f000..0x0b83fa14]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x21125b80> (a java.util.ArrayList)
            at java.lang.Object.wait(Object.java:485)
            at com.sun.deploy.util.Trace$TraceMsgQueueChecker.run(Unknown Source)
            - locked <0x21125b80> (a java.util.ArrayList)
            at java.lang.Thread.run(Unknown Source)
    
    "AWT-Windows" daemon prio=6 tid=0x0aaeac00 nid=0x1344 runnable [0x0b73f000..0x0b
    73fa94]
       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)
    
    "AWT-Shutdown" prio=6 tid=0x0aaea000 nid=0x29c in Object.wait() [0x0b63f000..0x0
    b63fb14]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x21123248> (a java.lang.Object)
            at java.lang.Object.wait(Object.java:485)
            at sun.awt.AWTAutoShutdown.run(Unknown Source)
            - locked <0x21123248> (a java.lang.Object)
            at java.lang.Thread.run(Unknown Source)
    
    "Java2D Disposer" daemon prio=10 tid=0x0aae8c00 nid=0x1328 in Object.wait() [0x0
    b53f000..0x0b53fb94]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x211232d8> (a java.lang.ref.ReferenceQueue$Lock)
            at java.lang.ref.ReferenceQueue.remove(Unknown Source)
            - locked <0x211232d8> (a java.lang.ref.ReferenceQueue$Lock)
            at java.lang.ref.ReferenceQueue.remove(Unknown Source)
            at sun.java2d.Disposer.run(Unknown Source)
            at java.lang.Thread.run(Unknown Source)
    
    "Low Memory Detector" daemon prio=6 tid=0x0aa36c00 nid=0x1654 runnable [0x000000
    00..0x00000000]
       java.lang.Thread.State: RUNNABLE
    
    "CompilerThread0" daemon prio=10 tid=0x0aa2c000 nid=0x12dc waiting on condition
    [0x00000000..0x0b0ff640]
       java.lang.Thread.State: RUNNABLE
    
    "Attach Listener" daemon prio=10 tid=0x0aa2ac00 nid=0x13bc runnable [0x00000000.
    .0x00000000]
       java.lang.Thread.State: RUNNABLE
    
    "Signal Dispatcher" daemon prio=10 tid=0x0aa2a000 nid=0x13c0 waiting on conditio
    n [0x00000000..0x00000000]
       java.lang.Thread.State: RUNNABLE
    
    "Finalizer" daemon prio=8 tid=0x0aa25800 nid=0x11f0 in Object.wait() [0x0adff000
    ..0x0adffa94]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x21123508> (a java.lang.ref.ReferenceQueue$Lock)
            at java.lang.ref.ReferenceQueue.remove(Unknown Source)
            - locked <0x21123508> (a java.lang.ref.ReferenceQueue$Lock)
            at java.lang.ref.ReferenceQueue.remove(Unknown Source)
            at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)
    
    "Reference Handler" daemon prio=10 tid=0x0aa21400 nid=0xfb4 in Object.wait() [0x
    0acff000..0x0acffb14]
       java.lang.Thread.State: WAITING (on object monitor)
            at java.lang.Object.wait(Native Method)
            - waiting on <0x21123078> (a java.lang.ref.Reference$Lock)
            at java.lang.Object.wait(Object.java:485)
            at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)
            - locked <0x21123078> (a java.lang.ref.Reference$Lock)
    
    "main" prio=6 tid=0x01fe9c00 nid=0x1248 runnable [0x00000000..0x06d2fbf4]
       java.lang.Thread.State: RUNNABLE
    
    "VM Thread" prio=10 tid=0x0aa20000 nid=0x2e8 runnable
    
    "VM Periodic Task Thread" prio=10 tid=0x0aa4d400 nid=0x1100 waiting on condition
    
    
    JNI global references: 1069
    
    Heap
     def new generation   total 960K, used 907K [0x20960000, 0x20a60000, 0x210c0000)
    
      eden space 896K,  94% used [0x20960000, 0x20a32f60, 0x20a40000)
      from space 64K, 100% used [0x20a50000, 0x20a60000, 0x20a60000)
      to   space 64K,   0% used [0x20a40000, 0x20a40000, 0x20a50000)
     tenured generation   total 4096K, used 3309K [0x210c0000, 0x214c0000, 0x2696000
    0)
       the space 4096K,  80% used [0x210c0000, 0x213fb7f8, 0x213fb800, 0x214c0000)
     compacting perm gen  total 12288K, used 3986K [0x26960000, 0x27560000, 0x2a9600
    00)
       the space 12288K,  32% used [0x26960000, 0x26d44b70, 0x26d44c00, 0x27560000)
        ro space 8192K,  62% used [0x2a960000, 0x2ae62ba0, 0x2ae62c00, 0x2b160000)
        rw space 12288K,  52% used [0x2b160000, 0x2b7a88e0, 0x2b7a8a00, 0x2bd60000)
    
    [Loaded sun.plugin.JavaRunTime$1 from C:\PROGRA~1\Java\JRE16~3.0_0\lib\plugin.ja
    r]
    [Loaded sun.plugin.util.PluginSysUtil$1AWTInvocationLock from C:\PROGRA~1\Java\J
    RE16~3.0_0\lib\plugin.jar]
    [Loaded javax.swing.JFrame from shared objects file]
    [Loaded com.sun.deploy.util.ConsoleWindow from C:\PROGRA~1\Java\JRE16~3.0_0\lib\
    deploy.jar]
    [Loaded com.sun.deploy.util.ConsoleWindow$1 from C:\PROGRA~1\Java\JRE16~3.0_0\li
    b\deploy.jar]
    Une idée ?

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