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Re: WebObjects application instances hanging - Deadlocks occurring
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Re: WebObjects application instances hanging - Deadlocks occurring

  • Subject: Re: WebObjects application instances hanging - Deadlocks occurring
  • From: Raghavender Bokka <email@hidden>
  • Date: Tue, 18 Nov 2014 17:09:40 +0530
Hi Ralf,

The following are the exceptions generating in the log files when we enable the ERX logging, and we do not have any code in the Session.sleep method:

-----------------------------------------------------------------------
-----------------------------------------------------------------------
Exception
  at er.extensions.eof.ERXEC.unlock(ERXEC.java:501)
  at com.webobjects.eocontrol.EOEditingContext._sendOrEnqueueNotification(EOEditingContext.java:4721)
  at com.webobjects.eocontrol.EOEditingContext._objectsChangedInStore(EOEditingContext.java:3562)
  at er.extensions.eof.ERXEC._objectsChangedInStore(ERXEC.java:1285)
     ... skipped 7 stack elements
  at com.webobjects.eocontrol.EOObjectStoreCoordinator._objectsChangedInSubStore(EOObjectStoreCoordinator.java:693)
     ... skipped 16 stack elements
  at com.webobjects.eocontrol.EOObjectStoreCoordinator.saveChangesInEditingContext(EOObjectStoreCoordinator.java:386)
  at com.webobjects.eocontrol.EOEditingContext.saveChanges(EOEditingContext.java:3192)
  at er.extensions.eof.ERXEC._saveChanges(ERXEC.java:981)
  at er.extensions.eof.ERXEC.saveChanges(ERXEC.java:903)
  at TestTakingMode$StudentTestSessionMode.testSubmitted(TestTakingMode.java:648)
  at ReviewTestResponsePage.submitTest(ReviewTestResponsePage.java:99)
     ... skipped 4 stack elements
  at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60)
     ... skipped 46 stack elements
  at Application.dispatchRequest(Application.java:670)
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.appserver.ERXSession  - Will terminate, sessionId is FkDsWpsOxKy1TDaligNLDg
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.appserver.ERXBrowserFactory  - _incrementReferenceCounterForKey() - count = 26, key = IE.7.0.4.0.Windows.{cpu = "Unknown CPU"; geckoRevision = "No Gecko"; }
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After popping: [er.extensions.eof.ERXEC@dd151f]
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.ERXEC.LockLogger  - unlocked er.extensions.eof.ERXEC@13cd5b5
Exception
  at er.extensions.eof.ERXEC.unlock(ERXEC.java:501)
  at com.webobjects.appserver.WOSession._sleepInContext(WOSession.java:849)
  at com.webobjects.appserver.WOApplication.saveSessionForContext(WOApplication.java:1883)
  at er.extensions.appserver.ERXApplication.saveSessionForContext(ERXApplication.java:2075)
     ... skipped 6 stack elements
  at Application.dispatchRequest(Application.java:670)
  ... skipped 3 stack elements
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.ERXEC.LockLogger  - locked er.extensions.eof.ERXEC@13cd5b5
Exception
  at er.extensions.eof.ERXEC.lock(ERXEC.java:483)
  at com.webobjects.eocontrol.EOEditingContext._dispose(EOEditingContext.java:1116)
  at com.webobjects.eocontrol.EOEditingContext.dispose(EOEditingContext.java:1111)
  at er.extensions.eof.ERXEC.dispose(ERXEC.java:610)
  at com.webobjects.appserver.WOSession._sleepInContext(WOSession.java:854)
  at com.webobjects.appserver.WOApplication.saveSessionForContext(WOApplication.java:1883)
  at er.extensions.appserver.ERXApplication.saveSessionForContext(ERXApplication.java:2075)
     ... skipped 6 stack elements
  at Application.dispatchRequest(Application.java:670)
  ... skipped 3 stack elements
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After pushing: [er.extensions.eof.ERXEC@dd151f, er.extensions.eof.ERXEC@13cd5b5]
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After popping: [er.extensions.eof.ERXEC@dd151f]
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.ERXEC.LockLogger  - unlocked er.extensions.eof.ERXEC@13cd5b5
Exception
  at er.extensions.eof.ERXEC.unlock(ERXEC.java:501)
  at com.webobjects.eocontrol.EOEditingContext._dispose(EOEditingContext.java:1218)
  at com.webobjects.eocontrol.EOEditingContext.dispose(EOEditingContext.java:1111)
  at er.extensions.eof.ERXEC.dispose(ERXEC.java:610)
  at com.webobjects.appserver.WOSession._sleepInContext(WOSession.java:854)
  at com.webobjects.appserver.WOApplication.saveSessionForContext(WOApplication.java:1883)
  at er.extensions.appserver.ERXApplication.saveSessionForContext(ERXApplication.java:2075)
     ... skipped 6 stack elements
  at Application.dispatchRequest(Application.java:670)
  ... skipped 3 stack elements
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After pushing: [er.extensions.eof.ERXEC@dd151f, er.extensions.eof.ERXEC@dd151f]
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After popping: [er.extensions.eof.ERXEC@dd151f]
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.appserver.ERXBrowserFactory  - _decrementReferenceCounterForKey() - count = 25, key = IE.7.0.4.0.Windows.{cpu = "Unknown CPU"; geckoRevision = "No Gecko"; }
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.appserver.ERXBrowserFactory  - _decrementReferenceCounterForKey() - count = 15, key = IE.9.0.5.0.Windows.{cpu = "Unknown CPU"; geckoRevision = "No Gecko"; }
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.eof.ERXEC  - Unlock remaining: [er.extensions.eof.ERXEC@dd151f]
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.eof.ERXEC  - Unlocking autolocked editing context: er.extensions.eof.ERXEC@dd151f
Nov 17 22:22:01 Solar[6009] DEBUG er.extensions.appserver.ERXBrowserFactory  - _decrementReferenceCounterForKey() - count = 24, key = IE.7.0.4.0.Windows.{cpu = "Unknown CPU"; geckoRevision = "No Gecko"; }

-----------------------------------------------------------------------
-----------------------------------------------------------------------

Nov 17 22:20:58 Solar[6009] DEBUG er.extensions.ERXEC.LockLogger  - locked er.extensions.eof.ERXEC@13cd5b5
Exception
  at er.extensions.eof.ERXEC.lock(ERXEC.java:483)
  at com.webobjects.appserver.WOSession._awakeInContext(WOSession.java:835)
  at com.webobjects.appserver.WOApplication.restoreSessionWithID(WOApplication.java:1917)
  at er.extensions.appserver.ERXApplication.restoreSessionWithID(ERXApplication.java:2093)
     ... skipped 6 stack elements
  at Application.dispatchRequest(Application.java:670)
  ... skipped 3 stack elements
Nov 17 22:20:58 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After pushing: [er.extensions.eof.ERXEC@13cd5b5]
Nov 17 22:20:58 Solar[6009] DEBUG er.extensions.eof.ERXEC$DefaultFactory  - Setting default delegate on editing context: er.extensions.eof.ERXEC@1a3b17a allows validation: true
Nov 17 22:20:58 Solar[6009] DEBUG er.extensions.eof.ERXEC  - setting delegate to er.extensions.eof.ERXDefaultEditingContextDelegate@e93999
Nov 17 22:20:58 Solar[6009] DEBUG er.extensions.eof.ERXEC  - s.java:375)
        at er.extensions.eof.ERXEC.setDelegate(ERXEC.java:1312)
        at er.extensions.eof.ERXEC$DefaultFactory.setDefaultDelegateOnEditingContext(ERXEC.java:1408)
        at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1463)
        at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1434)
        at er.extensions.eof.ERXEC.newEditingContext(ERXEC.java:1540)
        at GenericComponent.localEditingContext(GenericComponent.java:75)
        at SelectTestPage.fetchTests(SelectTestPage.java:71)
        at SelectTestPage.selectNonDOETests(SelectTestPage.java:146)
        at ToolsHelperFrame.selectTestPageFrame(ToolsHelperFrame.java:29)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60)
        at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)
        at com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1324)
        at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1736)
        at com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:447)
        at com.webobjects.foundation.NSKeyValueCodingAdditions$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:212)
        at com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:1804)
        at com.webobjects.appserver._private.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50)
        at com.webobjects.appserver._private.WOHTMLURLValuedElement.invokeAction(WOHTMLURLValuedElement.java:138)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
        at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357)
        at Session.invokeAction(Session.java:191)
        at com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1745)
        at er.extensions.appserver.ajax.ERXAjaxApplication.invokeAction(ERXAjaxApplication.java:50)
        at er.extensions.appserver.ERXApplication.invokeAction(ERXApplication.java:1687)
        at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:206)
        at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)
        at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)
        at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)
        at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)
        at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
        at er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1802)
        at er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1767)
        at Application.dispatchRequest(Application.java:670)
        at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
        at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
        at java.lang.Thread.run(Thread.java:619)


Nov 17 22:20:48 Solar[6009] DEBUG er.extensions.eof.ERXEC$DefaultFactory  - Setting default delegate on editing context: er.extensions.eof.ERXEC@13cd5b5 allows validation: true
Nov 17 22:20:48 Solar[6009] DEBUG er.extensions.eof.ERXEC  - setting delegate to er.extensions.eof.ERXDefaultEditingContextDelegate@e93999
Nov 17 22:20:48 Solar[6009] DEBUG er.extensions.eof.ERXEC  - s.java:375)
        at er.extensions.eof.ERXEC.setDelegate(ERXEC.java:1312)
        at er.extensions.eof.ERXEC$DefaultFactory.setDefaultDelegateOnEditingContext(ERXEC.java:1408)
        at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1463)
        at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1434)
        at er.extensions.eof.ERXEC.newEditingContext(ERXEC.java:1540)
        at er.extensions.appserver.ERXSession.defaultEditingContext(ERXSession.java:353)
        at Session.setLoginUser(Session.java:106)
        at Main.login(Main.java:185)
        at Main.login(Main.java:120)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60)
        at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)
        at com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1324)
        at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1736)
        at com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:447)
        at com.webobjects.foundation.NSKeyValueCodingAdditions$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:212)
        at com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:1804)
        at com.webobjects.appserver._private.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50)
        at com.webobjects.appserver._private.WOSubmitButton.invokeAction(WOSubmitButton.java:70)
        at er.extensions.foundation.ERXPatcher$DynamicElementsPatches$SubmitButton.invokeAction(ERXPatcher.java:214)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at er.extensions.components._private.ERXWOForm.invokeAction(ERXWOForm.java:180)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at com.webobjects.appserver._private.WOComponentContent.invokeAction(WOComponentContent.java:38)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at com.webobjects.appserver._private.WOHTMLURLValuedElement.invokeAction(WOHTMLURLValuedElement.java:149)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
        at er.extensions.components.ERXComponent.invokeAction(ERXComponent.java:92)
        at com.webobjects.appserver._private.WOComponentReference.invokeAction(WOComponentReference.java:127)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86)
        at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
        at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
        at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
        at er.extensions.components.ERXComponent.invokeAction(ERXComponent.java:92)
        at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357)
        at Session.invokeAction(Session.java:191)
        at com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1745)
        at er.extensions.appserver.ajax.ERXAjaxApplication.invokeAction(ERXAjaxApplication.java:50)
        at er.extensions.appserver.ERXApplication.invokeAction(ERXApplication.java:1687)
        at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:206)
        at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)
        at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)
        at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)
        at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)
        at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
        at er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1802)
        at er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1767)
        at Application.dispatchRequest(Application.java:653)
        at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
        at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
        at java.lang.Thread.run(Thread.java:619)

Nov 17 22:20:48 Solar[6009] DEBUG er.extensions.ERXEC.LockLogger  - locked er.extensions.eof.ERXEC@13cd5b5
Exception
  at er.extensions.eof.ERXEC.lock(ERXEC.java:483)
  at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1465)
  at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1434)
  at er.extensions.eof.ERXEC.newEditingContext(ERXEC.java:1540)
  at er.extensions.appserver.ERXSession.defaultEditingContext(ERXSession.java:353)
  at Session.setLoginUser(Session.java:106)
  at Main.login(Main.java:185)
  at Main.login(Main.java:120)
     ... skipped 4 stack elements
  at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60)
     ... skipped 46 stack elements
  at Application.dispatchRequest(Application.java:653)
  ... skipped 3 stack elements
Nov 17 22:20:48 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After pushing: [er.extensions.eof.ERXEC@5971c3, er.extensions.eof.ERXEC@13cd5b5]
Nov 17 22:20:48 Solar[6009] DEBUG er.extensions.eof.ERXEC  - After popping: [er.extensions.eof.ERXEC@5971c3]
Nov 17 22:20:48 Solar[6009] DEBUG er.extensions.ERXEC.LockLogger  - unlocked er.extensions.eof.ERXEC@13cd5b5
Exception
  at er.extensions.eof.ERXEC.unlock(ERXEC.java:501)
  at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1467)
  at er.extensions.eof.ERXEC$DefaultFactory._newEditingContext(ERXEC.java:1434)
  at er.extensions.eof.ERXEC.newEditingContext(ERXEC.java:1540)
  at er.extensions.appserver.ERXSession.defaultEditingContext(ERXSession.java:353)
  at Session.setLoginUser(Session.java:106)
  at Main.login(Main.java:185)
  at Main.login(Main.java:120)
     ... skipped 4 stack elements
  at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60)
     ... skipped 46 stack elements
  at Application.dispatchRequest(Application.java:653)
  ... skipped 3 stack elements
-----------------------------------------------------------------------
-----------------------------------------------------------------------

Any help would be appreciated.

Regards,
Raghu.

On 17-Nov-2014, at 11:41 PM, email@hidden wrote:

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> Today's Topics:
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>   1. Re: WebObjects application instances hanging - Deadlocks
>      occurring (Ralf Schuchardt)
>   2. Re: WOWODC 2015 - April 25, 26 and 27 2015
>      (CHRISTOPH WICK | i4innovation GmbH, Bonn)
>   3. Re: WOCommunity maven repository down? (Henrique Prange)
>   4. Re: WOWODC 2015 - April 25, 26 and 27 2015 (Klaus Berkling)
>   5. Re: Ponder docs or examples (Flavio Donadio)
>   6. Re: Ponder docs or examples (Ramsey Gurley)
>   7. Re: Ponder and/or d2w (Ramsey Gurley)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 17 Nov 2014 15:03:44 +0100
> From: Ralf Schuchardt <email@hidden>
> To: Development WebObjects <email@hidden>
> Subject: Re: WebObjects application instances hanging - Deadlocks
> 	occurring
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=us-ascii
>
> Hi,
>
> Am 17.11.2014 um 13:33 schrieb Raghavender Bokka <email@hidden>:
>
>> Hi Team,
>>
>> Some of our WebObjects application instances are hanging when some user load (around 1000 users) are testing, when we look into the java process thread dump there are deadlocks occurring. The following is the thread dump:
>
> [...]
>
>> "WorkerThread24" prio=3 tid=0x00e42800 nid=0x31 waiting on condition [0xd49fe000]
>>  java.lang.Thread.State: WAITING (parking)
>>       at sun.misc.Unsafe.park(Native Method)
>>       - parking to wait for  <0xdc3837c8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
>>       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>>       at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747)
>>       at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:778)
>>       at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114)
>>       at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186)
>>       at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)
>>       at com.webobjects.eocontrol.EOEditingContext.lock(EOEditingContext.java:4617)
>>       at er.extensions.eof.ERXEC.lock(ERXEC.java:480)
>>       at com.webobjects.appserver.WOSession._awakeInContext(WOSession.java:835)
>>       at com.webobjects.appserver.WOApplication.restoreSessionWithID(WOApplication.java:1917)
>>       at er.extensions.appserver.ERXApplication.restoreSessionWithID(ERXApplication.java:2093)
>>       at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:324)
>>       at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)
>>       at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)
>>       - locked <0xdbc631d0> (a java.lang.Object)
>>       at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
>>       at er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1802)
>>       at er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1767)
>>       at Application.dispatchRequest(Application.java:670)
>>       at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
>>       at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
>>       at java.lang.Thread.run(Thread.java:619)
>
> This stack trace seems to indicate, that the defaultEditingContext was not unlocked in the previous request. Do you see an exception prior to the deadlock?
> If you have code in a Session.sleep() method, make sure to catch all exceptions there.
>
> Ralf



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