Re: deadlock in CayenneContext.commitChanges

Mon, 12 Nov 2007 01:41:00 -0800 


On 12/11/2007, at 1:33 AM, Andrus Adamchik wrote:
Actually in 3.0 DataContext IS thread-safe (DataObjects are not). CayenneContext probably not. At least no effort has been made to make it thread-safe.
OK. I reverted my change to the docs about this. I'm thinking the stack trace below shows that CayenneContext is not thread safe.
Now regarding the stack below... Is it possible to take a thread dump to see what locks are involved? I.e. "kill -QUIT pid" 

 [java] Found one Java-level deadlock:
     [java] =============================
     [java] "Foxtrot Single Worker Thread #4":
[java] waiting to lock monitor 0x0080e700 (object 0x1b5518d8, a org.apache.cayenne.CayenneContextGraphManager), 
     [java]   which is held by "AWT-EventQueue-0"
     [java] "AWT-EventQueue-0":
[java] waiting to lock monitor 0x0080e7b4 (object 0x1b3cef98, a org.apache.cayenne.event.DispatchQueue), 
     [java]   which is held by "Foxtrot Single Worker Thread #4"
     [java]
     [java] Java stack information for the threads listed above:
     [java] ===================================================
     [java] "Foxtrot Single Worker Thread #4":
[java] at org .apache .cayenne .CayenneContextMergeHandler .runWithEventsDisabled(CayenneContextMergeHandler.java:266) [java] - waiting to lock <0x1b5518d8> (a org.apache.cayenne.CayenneContextGraphManager) [java] at org .apache .cayenne .CayenneContextMergeHandler .graphFlushed(CayenneContextMergeHandler.java:81) [java] at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source) [java] at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25) 
     [java]     at java.lang.reflect.Method.invoke(Method.java:585)
[java] at org.apache.cayenne.util.Invocation.fire(Invocation.java:204) [java] at org.apache.cayenne.event.EventManager $Dispatch.fire(EventManager.java:409) [java] at org .apache.cayenne.event.DispatchQueue.dispatchEvent(DispatchQueue.java: 162) [java] at org .apache.cayenne.event.DispatchQueue.dispatchEvent(DispatchQueue.java:58) [java] - locked <0x1b3cef98> (a org.apache.cayenne.event.DispatchQueue) [java] at org.apache.cayenne.event.EventManager.dispatchEvent(EventManager.java: 348) [java] at org.apache.cayenne.event.EventManager.postEvent(EventManager.java:319) [java] at org.apache.cayenne.remote.ClientChannel.onSync(ClientChannel.java:215) [java] at org.apache.cayenne.CayenneContext.doCommitChanges(CayenneContext.java: 249) [java] - locked <0x1bcbcfe0> (a org.apache.cayenne.CayenneContextGraphManager) [java] at org.apache.cayenne.CayenneContext.commitChanges(CayenneContext.java:208) [java] at ish.oncourse.cayenne.CayenneContext.commitChanges(CayenneContext.java: 80) [java] at ish .oncourse .util .xmlimport .ImportXMLHandler .commitAndCreateNewContextWhenObjectsInContextExceed (ImportXMLHandler.java:793) [java] at ish .oncourse .util.xmlimport.ImportXMLHandler.endElement(ImportXMLHandler.java:354) [java] at com .sun .org .apache .xerces .internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java: 633) [java] at com .sun .org .apache .xerces .internal .impl .XMLDocumentFragmentScannerImpl .scanEndElement(XMLDocumentFragmentScannerImpl.java:1241) [java] at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl $ FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java: 1685) [java] at com .sun .org .apache .xerces .internal .impl .XMLDocumentFragmentScannerImpl .scanDocument(XMLDocumentFragmentScannerImpl.java:368) [java] at com .sun .org .apache .xerces .internal.parsers.XML11Configuration.parse(XML11Configuration.java:834) [java] at com .sun .org .apache .xerces .internal.parsers.XML11Configuration.parse(XML11Configuration.java:764) [java] at com .sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java: 148) [java] at com .sun .org .apache .xerces .internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242) [java] at ish.oncourse.util.xmlimport.ImportManager $1.run(ImportManager.java:124) [java] at foxtrot.AbstractWorkerThread $1.run(AbstractWorkerThread.java:39) [java] at java.security.AccessController.doPrivileged(Native Method) [java] at foxtrot.AbstractWorkerThread.runTask(AbstractWorkerThread.java:35) [java] at foxtrot.workers.SingleWorkerThread.run(SingleWorkerThread.java:196) [java] at foxtrot.workers.SingleWorkerThread.run(SingleWorkerThread.java:179) 
     [java]     at java.lang.Thread.run(Thread.java:613)
     [java] "AWT-EventQueue-0":
[java] at org .apache.cayenne.event.DispatchQueue.dispatchEvent(DispatchQueue.java:54) [java] - waiting to lock <0x1b3cef98> (a org.apache.cayenne.event.DispatchQueue) [java] at org.apache.cayenne.event.EventManager.dispatchEvent(EventManager.java: 348) [java] at org.apache.cayenne.event.EventManager.postEvent(EventManager.java:319) [java] at org .apache .cayenne .CayenneContextGraphManager.send(CayenneContextGraphManager.java:309) [java] at org .apache .cayenne .CayenneContextGraphManager .graphCommitted(CayenneContextGraphManager.java:146) [java] at org.apache.cayenne.CayenneContext.doCommitChanges(CayenneContext.java: 263) [java] - locked <0x1b5518d8> (a org.apache.cayenne.CayenneContextGraphManager) [java] at org.apache.cayenne.CayenneContext.commitChanges(CayenneContext.java:208) [java] at ish.oncourse.cayenne.CayenneContext.commitChanges(CayenneContext.java: 80) [java] at ish.oncourse.PreferenceController.commit(PreferenceController.java:151) [java] at ish.oncourse.PreferenceController.setValue(PreferenceController.java: 128) [java] at ish .persistence .CommonPreferenceController .setListViewColumns(CommonPreferenceController.java:799) [java] at ish.oncourse.controller.ListController.dispose(ListController.java:657) [java] - locked <0x1bda6ce8> (a ish.oncourse.controller.entity.StudentListController) [java] at ish .oncourse.controller.ViewController.windowClosing(ViewController.java: 802) [java] at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:291) 
     [java]     at java.awt.Window.processWindowEvent(Window.java:1203)
     [java]     at javax.swing.JFrame.processWindowEvent(JFrame.java:267)
     [java]     at java.awt.Window.processEvent(Window.java:1161)
[java] at java.awt.Component.dispatchEventImpl(Component.java: 4068) [java] at java.awt.Container.dispatchEventImpl(Container.java: 2068) 
     [java]     at java.awt.Window.dispatchEventImpl(Window.java:1791)
     [java]     at java.awt.Component.dispatchEvent(Component.java:3903)
     [java]     at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
[java] at java .awt .EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java: 269) [java] at java .awt .EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java: 190) [java] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184) [java] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176) [java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [java] at sun .reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 39) [java] at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25) 
     [java]     at java.lang.reflect.Method.invoke(Method.java:585)
[java] at foxtrot .pumps.ConditionalEventPump.pumpEvents(ConditionalEventPump.java:98) [java] at foxtrot.AbstractSyncWorker.post(AbstractSyncWorker.java:98) 
     [java]     at foxtrot.Worker.post(Worker.java:128)
[java] at ish .oncourse .util.xmlimport.ImportManager.importDocument(ImportManager.java:120) [java] at ish.oncourse.util.xmlimport.ImportManager.run(ImportManager.java:86) [java] at ish.oncourse.ControllerManager.importXML(ControllerManager.java:176) [java] at ish .oncourse .view.frame.CommonFrame.importXMLActionPerformed(CommonFrame.java:545) [java] at ish.oncourse.view.frame.CommonFrame.access $2(CommonFrame.java:544) [java] at ish.oncourse.view.frame.CommonFrame $6.actionPerformed(CommonFrame.java:253) [java] at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882) [java] at javax.swing.AbstractButton $Handler.actionPerformed(AbstractButton.java:2202) [java] at javax .swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java: 420) [java] at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258) [java] at javax.swing.AbstractButton.doClick(AbstractButton.java:334) [java] at apple.laf.ScreenMenuItem.actionPerformed(ScreenMenuItem.java:96) 
     [java]     at java.awt.MenuItem.processActionEvent(MenuItem.java:597)
     [java]     at java.awt.MenuItem.processEvent(MenuItem.java:556)
[java] at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:298) [java] at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:286) 
     [java]     at java.awt.EventQueue.dispatchEvent(EventQueue.java:466)
[java] at java .awt .EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java: 269) [java] at java .awt .EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java: 190) [java] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184) [java] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176) [java] at java.awt.EventDispatchThread.run(EventDispatchThread.java:110) 
     [java]
     [java] Found 1 deadlock.
     [java]



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