A while ago I wrote a Java class to detect deadlocks in our desktop
application. Well it finally paid off! Below is the log it produced.
What we can see is that HotFolderManagementWindow has its own thread
that is trying to initialize swing components - a classic no-no. Below
that is the class which finds the deadlocks.
So can you do this sort of thing in Cocoa I wonder?
Cheers, Eric
FATAL 2008-04-17 08:02:38,627 [Thread-3 DeadlockFinder] DeadlockFinder -
2 threads deadlocked
----------------------------
ThreadName = Thread-36 HotFolderManagementWindow$ConnectionDialog
LockName = java.awt.Component$AWTTreeLock@128e909
LockOwnerName = AWT-EventQueue-0
stack trace...
java.awt.Container.getComponent(Container.java:278)
javax.swing.JViewport.getView(JViewport.java:940)
de.javasoft.plaf.synthetica.StyleFactory.getStyle(StyleFactory.java:684)
de.javasoft.plaf.synthetica.StyleFactory.getStyle(StyleFactory.java:169)
javax.swing.plaf.synth.SynthLookAndFeel.getStyle(SynthLookAndFeel.java:2
00)
javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(SynthLookAndFeel.jav
a:232)
javax.swing.plaf.synth.SynthScrollPaneUI.updateStyle(SynthScrollPaneUI.j
ava:77)
javax.swing.plaf.synth.SynthScrollPaneUI.installDefaults(SynthScrollPane
UI.java:70)
javax.swing.plaf.basic.BasicScrollPaneUI.installUI(BasicScrollPaneUI.jav
a:185)
javax.swing.JComponent.setUI(JComponent.java:653)
javax.swing.JScrollPane.setUI(JScrollPane.java:342)
javax.swing.JScrollPane.updateUI(JScrollPane.java:355)
javax.swing.JScrollPane.<init>(JScrollPane.java:267)
javax.swing.JScrollPane.<init>(JScrollPane.java:313)
com.creo.iris.cambridge.panels.hotFolders.HotFolderManagementWindow.init
(HotFolderManagementWindow.java:196)
com.creo.iris.cambridge.panels.hotFolders.HotFolderManagementWindow.acce
ss$3(HotFolderManagementWindow.java:173)
com.creo.iris.cambridge.panels.hotFolders.HotFolderManagementWindow$Conn
ectionDialog.run(HotFolderManagementWindow.java:1647)
java.lang.Thread.run(Thread.java:595)
----------------------------
ThreadName = AWT-EventQueue-0
LockName = de.javasoft.plaf.synthetica.StyleFactory@db681c
LockOwnerName = Thread-36 HotFolderManagementWindow$ConnectionDialog
stack trace...
de.javasoft.plaf.synthetica.StyleFactory.getStyle(StyleFactory.java:149)
javax.swing.plaf.synth.SynthLookAndFeel.getStyle(SynthLookAndFeel.java:2
00)
javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(SynthLookAndFeel.jav
a:232)
javax.swing.plaf.synth.SynthPanelUI.updateStyle(SynthPanelUI.java:70)
javax.swing.plaf.synth.SynthPanelUI.installDefaults(SynthPanelUI.java:57
)
javax.swing.plaf.basic.BasicPanelUI.installUI(BasicPanelUI.java:39)
javax.swing.plaf.synth.SynthPanelUI.installUI(SynthPanelUI.java:37)
javax.swing.JComponent.setUI(JComponent.java:653)
javax.swing.JPanel.setUI(JPanel.java:131)
javax.swing.JPanel.updateUI(JPanel.java:104)
______________________________________________________
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import org.apache.log4j.Logger;
/**
* This class implements a daemon thread which periodically checks to
see if
* there are any threads deadlocked, and reports the situation if there
are.
* Note: this class calls System.exit(1) if it finds a deadlock.
* @author Eric Kolotyluk
*/
public class DeadlockFinder extends Thread
{
private static final Logger LOG =
Logger.getLogger(DeadlockFinder.class);
private long count;
ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
public DeadlockFinder()
{
setDaemon(true);
setName(getName() + " DeadlockFinder");
setPriority(Thread.MIN_PRIORITY + 1);
}
public void run()
{
LOG.info("running, priority = " + getPriority());
try
{
for (;;)
{
sleep(20000); // TODO - make this a config.preferences
setting. EK
// Note: the following can be an expensive operation
long [] threads =
threadMXBean.findMonitorDeadlockedThreads();
if (threads == null || threads.length == 0)
{
// Try not to flood the log with these messages.
EK
if (count++ < 100 || count % 100 == 0)
LOG.debug("no threads are deadlocked");
continue;
}
LOG.fatal(threads.length + " threads deadlocked");
ThreadInfo [] threadInfoArray =
threadMXBean.getThreadInfo(threads, Integer.MAX_VALUE);
for (ThreadInfo threadInfo : threadInfoArray)
{
System.out.println("\n----------------------------");
System.out.println("ThreadName = " +
threadInfo.getThreadName());
System.out.println("LockName = " +
threadInfo.getLockName());
System.out.println("LockOwnerName = " +
threadInfo.getLockOwnerName());
StackTraceElement [] stackTrace =
threadInfo.getStackTrace();
if (stackTrace == null || stackTrace.length ==
0)
System.out.println("no stack trace");
else
{
System.out.println("stack trace...");
for (StackTraceElement stackTraceElement
: stackTrace)
{
System.out.println(stackTraceElement.toString());
}
}
}
System.exit(1);
}
}
catch (InterruptedException e)
{
// just return
}
}
}
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Java-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/java-dev/email@hidden
This email sent to email@hidden
