1
我正在調試一些使用SwingWorker編寫的代碼來執行數值計算和GUI更新的混合。該SwingWorker類掛起與以下堆棧跟蹤：Java SwingWorker掛
Full thread dump Java HotSpot(TM) Client VM (14.3-b01 mixed mode, sharing):
"SwingWorker-pool-3-thread-4" prio=6 tid=0x07fd7c00 nid=0x143c waiting on condition [0x0a33f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at sum.ee.ui.modelviewer.ModelViewer$ModelAnimator.doInBackground(ModelViewer.java:940)
at sum.ee.ui.modelviewer.ModelViewer$ModelAnimator.doInBackground(ModelViewer.java:877)
at javax.swing.SwingWorker$1.call(SwingWorker.java:274)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at javax.swing.SwingWorker.run(SwingWorker.java:313)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
"SwingWorker-pool-3-thread-3" prio=6 tid=0x07fd7000 nid=0x11a8 waiting for monitor entry [0x0a2af000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.awt.Component.resize(Component.java:2044)
- waiting to lock <0x24b936a0> (a java.awt.Component$AWTTreeLock)
at java.awt.Component.setSize(Component.java:2035)
at java.awt.Component.resize(Component.java:2069)
at java.awt.Component.setSize(Component.java:2060)
at javax.swing.JViewport.setViewSize(JViewport.java:1038)
at javax.swing.ViewportLayout.layoutContainer(ViewportLayout.java:183)
at java.awt.Container.layout(Container.java:1421)
at java.awt.Container.doLayout(Container.java:1410)
at jsyntaxpane.components.LineNumbersRuler.updateSize(LineNumbersRuler.java:109)
at jsyntaxpane.components.LineNumbersRuler.removeUpdate(LineNumbersRuler.java:203)
at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:243)
at jsyntaxpane.SyntaxDocument.fireRemoveUpdate(SyntaxDocument.java:118)
at javax.swing.text.AbstractDocument.handleRemove(AbstractDocument.java:608)
at javax.swing.text.AbstractDocument.remove(AbstractDocument.java:576)
at javax.swing.JEditorPane.setText(JEditorPane.java:1493)
at sum.ee.ui.SourceCodePanel.clearSourcePane(SourceCodePanel.java:256)
at sum.ee.ui.SourceCodePanel.access$100(SourceCodePanel.java:47)
at sum.ee.ui.SourceCodePanel$1.stateChanged(SourceCodePanel.java:209)
at sum.ee.ui.VisualizationAggregator.fireStateChanged(VisualizationAggregator.java:300)
at sum.ee.ui.VisualizationAggregator.update(VisualizationAggregator.java:97)
at sum.ee.ui.modelviewer.ModelViewer$ModelAnimator.doInBackground(ModelViewer.java:918)
at sum.ee.ui.modelviewer.ModelViewer$ModelAnimator.doInBackground(ModelViewer.java:877)
at javax.swing.SwingWorker$1.call(SwingWorker.java:274)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at javax.swing.SwingWorker.run(SwingWorker.java:313)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor
$ Worker.run（ThreadPoolExecutor.java:908） 在java.lang.Thread.run（Thread.java:619）
我的理解是GUI工作不應該在doInBackground（）內完成，而應該在done（）中完成。我將doInBackground（）中的所有代碼移動到done（）中，然後執行了一個天真的實驗，但它仍然無法工作。是否有任何提示，人們可以給我什麼我能做的根源導致這個問題？代碼如下所示：
protected Void doInBackground() {
isAnimating = true;
resetButtonBackgrounds();
backgroundColor = new Color(175, 255, 175); // Soft Green
JToggleButton b = null;
for (final int index : modelIndices) {
if (index == modelIndices.get(modelIndices.size() - 1)) {
backgroundColor = defaultBackgroundColor;
}
if (!keepTrace) {
// Resetting the backgrounds is necessary to have
// individual display of the changing elements due to
// the fact that there can be multiple nodes per
// source line. The reset works in combination
// with updating from ModelViewer.this (as opposed
// to the 'this' of ModelAnimator instances) due
// to not sending an event to itself. Furthermore,
// if the event was sent from ModelAnimator, the model
// indices are recalculated, causing a jump when multiple
// element source lines are encountered.
resetButtonBackgrounds();
}
aggregator.modelIndex(index);
aggregator.update(ModelViewer.this);
b = getButtonByIndex(index);
scrollRectToVisible(b.getBounds());
ModelViewer.this.repaint();
try {
StaticTools.sleepAtLeast(sleepTimeMilliseconds);
} catch (final InterruptedException ex) {
// continue with thread
}
}
isAnimating = false;
if (b != null) {
Color orig = b.getBackground();
Color blink = Color.PINK;
Color current = orig;
for (int i = 0; i < 100; i++) {
try {
Thread.sleep(100);
} catch (InterruptedException ex) {
}
if (current == orig) {
current = blink;
} else {
current = orig;
}
b.setBackground(current);
ModelViewer.this.repaint();
}
}
return null;
}
另一個線索是，有一些執行兩個線程的SwingWorker。他們可以運行相同的線程嗎？
更新：這是執行的SwingWorker代碼：
公衆最終無效動畫（最終長delayBetweenUpdatesMilliseconds， 最終名單modelIndices， 最終布爾keepTrace， 最終名單的PropertyChangeListeners）{
ModelAnimator modelAnimator =
new ModelAnimator(delayBetweenUpdatesMilliseconds, modelIndices,
keepTrace);
for (final PropertyChangeListener listener : propertyChangeListeners) {
modelAnimator.addPropertyChangeListener(listener);
}
modelAnimator.execute();
}
我不是專家，但它看起來像你有一個僵局。代碼看起來是什麼調用該方法？ – ChadNC 2009-11-24 20:32:37
嗨乍得，謝謝你的迴應。我想如果我有一個死鎖，堆棧跟蹤會顯示它 - 那通常是它所做的。調用它的代碼只是在SwingWorker上執行execute（）。 – 2009-11-24 20:39:26
可能是連續的睡眠呼叫（）。當第二次呼叫進入睡眠狀態時，該線程可能仍然處於睡眠狀態，這可能是造成死鎖的原因。我一直爲工作線程創建了一個可運行對象的實例。 – ChadNC 2009-11-24 20:47:43