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AjaxUpdateContainer successive updates + Deadlock
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AjaxUpdateContainer successive updates + Deadlock

  • Subject: AjaxUpdateContainer successive updates + Deadlock
  • From: Paul Stringer <email@hidden>
  • Date: Mon, 09 Mar 2009 13:06:09 +0100
I'm struggling here with a deadlock situation that as far as I can see is caused by Ajax Updates. What I've done so far. Removed any traces of a shared editing context from my app to count that out. I've double checked my Wonder autolocking properties which are as below and double checked I only use ERXEC.newEditingContext() with not a defaultEditingContext() in sight.

er.extensions.ERXApplication.useEditingContextUnlocker = true
er.extensions.ERXEC.defaultAutomaticLockUnlock = true
er.extensions.ERXEC.defaultCoalesceAutoLocks = true
er.extensions.ERXEC.useSharedEditingContext = false

The debug below leads up to the deadlock. They are always triggered when a AjaxUpdateContainer is fired numerous times in succession where they are in the same session on the same page accessing new EO's - it can quite happily work for a while but always seems to start getting very confused after a lot of this kind of abuse. Despite mentions of other threads in the warnings I don't have any background threads that I'm explicitly creating myself.

Any suggestions of things I can try appreciated before I give up and rip the thing out and replace it with something more boring.

So things running smoothly then a bunch of AjaxUpdateContainer Updates in succession then.....

Mar 08 22:49:59 SMS[????] (ERXNSLogLog4jBridge.java:46) DEBUG NSLog - *** EOEditingContext: access when another thread holds a lock: _eoForGID()!
java.lang.Exception: This is not a real exception, just a stack trace of the location of the contested lock:
at com .webobjects .eocontrol .EOEditingContext ._EOAssertSafeMultiThreadedAccess(EOEditingContext.java:5182)
at com .webobjects .eocontrol .EOEditingContext ._EOAssertSafeMultiThreadedReadAccess(EOEditingContext.java:5156)
at com .webobjects.eocontrol.EOEditingContext._eoForGID(EOEditingContext.java: 2636)
at com .webobjects .eocontrol.EOEditingContext.faultForGlobalID(EOEditingContext.java:3635)
at er.extensions.eof.ERXEC.faultForGlobalID(ERXEC.java:1013)
at com .webobjects .eoaccess .EODatabaseContext.objectsForSourceGlobalID(EODatabaseContext.java:4044)
at com .webobjects .eocontrol .EOObjectStoreCoordinator .objectsForSourceGlobalID(EOObjectStoreCoordinator.java:682)
at com .webobjects .eocontrol .EOEditingContext.objectsForSourceGlobalID(EOEditingContext.java:3965)
at er.extensions.eof.ERXEC.objectsForSourceGlobalID(ERXEC.java:1070)
at com .webobjects .eoaccess.EODatabaseContext._fireArrayFault(EODatabaseContext.java:4427)
at com .webobjects .eoaccess .EOAccessArrayFaultHandler .completeInitializationOfObject(EOAccessArrayFaultHandler.java:70)
at com .webobjects .eocontrol ._EOCheapCopyMutableArray.willRead(_EOCheapCopyMutableArray.java:38)
at com .webobjects .eocontrol ._EOCheapCopyMutableArray.count(_EOCheapCopyMutableArray.java:92)
at er.extensions.foundation.ERXArrayUtilities $SortOperator.compute(ERXArrayUtilities.java:1018)
at com .webobjects .foundation.NSArray._valueForKeyPathWithOperator(NSArray.java:795)
at com.webobjects.foundation.NSArray.valueForKeyPath(NSArray.java:831)
at com.webobjects.foundation.NSKeyValueCodingAdditions $Utility.valueForKeyPath(NSKeyValueCodingAdditions.java:149)
at com.webobjects.foundation.NSKeyValueCodingAdditions $DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java: 217)
at com .webobjects .eocontrol.EOCustomObject.valueForKeyPath(EOCustomObject.java:1675)
at com.webobjects.foundation.NSKeyValueCodingAdditions $Utility.valueForKeyPath(NSKeyValueCodingAdditions.java:149)
at com.webobjects.foundation.NSKeyValueCodingAdditions $DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java: 217)
at com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java: 1600)
at com .webobjects .appserver ._private .WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:46)
at er .extensions .components ._private.ERXWORepetition.createContext(ERXWORepetition.java:334)
at er .extensions .components._private.ERXWORepetition.invokeAction(ERXWORepetition.java: 367)
at com .webobjects .appserver ._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
at com .webobjects .appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:110)
at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java: 945)
at er.extensions.components.ERXComponent.invokeAction(ERXComponent.java:93)
at com .webobjects .appserver ._private.WOComponentReference.invokeAction(WOComponentReference.java: 104)
at com .webobjects .appserver ._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
at er .extensions .components .conditionals .ERXWOConditional.invokeChildrenAction(ERXWOConditional.java:111)
at com .webobjects .appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:110)
at er .extensions .components .conditionals.ERXWOConditional.invokeAction(ERXWOConditional.java:102)
at com .webobjects .appserver ._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
at com .webobjects .appserver ._private.WOGenericContainer.invokeAction(WOGenericContainer.java:23)
at com .webobjects .appserver ._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
at com .webobjects .appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:110)
at com .webobjects .appserver ._private.WOComponentContent.invokeAction(WOComponentContent.java:31)
at com .webobjects .appserver ._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
at com .webobjects .appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:110)
at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java: 945)
at com .webobjects .appserver ._private.WOComponentReference.invokeAction(WOComponentReference.java: 104)
at com .webobjects .appserver ._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
at com .webobjects .appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:110)
at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java: 945)
at com .webobjects .appserver ._private.WOComponentReference.invokeAction(WOComponentReference.java: 104)
at com .webobjects .appserver ._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:101)
at com .webobjects .appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:110)
at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java: 945)
at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1168)
at com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java: 1375)
at er .extensions .appserver .ajax.ERXAjaxApplication.invokeAction(ERXAjaxApplication.java:48)
at er .extensions.appserver.ERXApplication.invokeAction(ERXApplication.java: 1539)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedPage(WOComponentRequestHandler.java:196)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedSession(WOComponentRequestHandler.java:287)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedApplication(WOComponentRequestHandler.java:322)
at com .webobjects .appserver ._private .WOComponentRequestHandler ._handleRequest(WOComponentRequestHandler.java:358)
at com .webobjects .appserver ._private .WOComponentRequestHandler .handleRequest(WOComponentRequestHandler.java:435)
at er.ajax.AjaxRequestHandler.handleRequest(AjaxRequestHandler.java:17)
at com .webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java: 1306)
at er .extensions .appserver .ERXApplication.dispatchRequestImmediately(ERXApplication.java:1656)
at er .extensions .appserver.ERXApplication.dispatchRequest(ERXApplication.java:1620)
at com .webobjects .appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:173)
at com .webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java: 254)
at java.lang.Thread.run(Thread.java:613)

Mar 08 22:49:59 SMS[????] (ERXNSLogLog4jBridge.java:46) DEBUG NSLog - *** EODatabaseContext: access without lock!
java.lang.Exception: This is not a real exception, just a stack trace of the location of the missing lock:
at com .webobjects .eoaccess .EODatabaseContext ._EOAssertSafeMultiThreadedAccess(EODatabaseContext.java:4452)
at com .webobjects .eoaccess.EODatabaseContext.ownsGlobalID(EODatabaseContext.java:5718)
at com .webobjects .eocontrol .EOObjectStoreCoordinator .objectStoreForGlobalID(EOObjectStoreCoordinator.java:235)
at com .webobjects .eocontrol .EOObjectStoreCoordinator.refaultObject(EOObjectStoreCoordinator.java: 697)
at com .webobjects .eocontrol.EOEditingContext.refaultObject(EOEditingContext.java:4009)
at er.extensions.eof.ERXEC.refaultObject(ERXEC.java:1098)
at com .webobjects .eocontrol.EOEditingContext.refaultObject(EOEditingContext.java:4062)
at er.extensions.eof.ERXEC.refaultObject(ERXEC.java:1098)
at com .webobjects .eocontrol .EOEditingContext ._newChangesFromInvalidatingObjectsWithGlobalIDs(EOEditingContext.java: 3520)
at com .webobjects .eocontrol .EOEditingContext._processObjectStoreChanges(EOEditingContext.java:3558)
at sun.reflect.GeneratedMethodAccessor228.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector.invoke(NSSelector.java:354)
at com .webobjects.foundation.NSSelector._safeInvokeSelector(NSSelector.java: 108)
at com .webobjects .eocontrol .EOEditingContext._sendOrEnqueueNotification(EOEditingContext.java:4784)
at com .webobjects .eocontrol .EOEditingContext._objectsChangedInStore(EOEditingContext.java:3598)
at er.extensions.eof.ERXEC._objectsChangedInStore(ERXEC.java:1285)
at sun.reflect.GeneratedMethodAccessor227.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector._safeInvokeMethod(NSSelector.java: 120)
at com.webobjects.foundation.NSNotificationCenter $_Entry.invokeMethod(NSNotificationCenter.java:601)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:545)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:575)
at com .webobjects .eocontrol .EOEditingContext._processRecentChanges(EOEditingContext.java:1886)
at com .webobjects .eocontrol.EOEditingContext.processRecentChanges(EOEditingContext.java: 1951)
at er.extensions.eof.ERXEC.processRecentChanges(ERXEC.java:659)
at com .webobjects .eocontrol .EOEditingContext._processEndOfEventNotification(EOEditingContext.java: 2213)
at com .webobjects .eocontrol .EOEditingContext._undoManagerCheckpoint(EOEditingContext.java:1956)
at sun.reflect.GeneratedMethodAccessor242.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector._safeInvokeMethod(NSSelector.java: 120)
at com.webobjects.foundation.NSNotificationCenter $_Entry.invokeMethod(NSNotificationCenter.java:601)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:545)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:559)
at com .webobjects .foundation .NSUndoManager._postCheckpointNotification(NSUndoManager.java:264)
at com .webobjects .foundation.NSUndoManager.endUndoGrouping(NSUndoManager.java:416)
at com .webobjects .foundation .NSUndoManager._processEndOfEventNotification(NSUndoManager.java:254)
at sun.reflect.GeneratedMethodAccessor304.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector.invoke(NSSelector.java:354)
at com .webobjects.foundation.NSSelector._safeInvokeSelector(NSSelector.java: 108)
at com.webobjects.foundation.NSDelayedCallbackCenter $NSLightInvocation.invoke(NSDelayedCallbackCenter.java:242)
at com .webobjects .foundation .NSDelayedCallbackCenter._eventEnded(NSDelayedCallbackCenter.java:208)
at com .webobjects .foundation .NSDelayedCallbackCenter.eventEnded(NSDelayedCallbackCenter.java:171)
at com .webobjects .appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:184)
at com .webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java: 254)
at java.lang.Thread.run(Thread.java:613)


It survives this trauma and carries on, warnings come and go in similar situations before a little later Boom!...

Mar 08 23:09:55 SMS[????] (ERXNSLogLog4jBridge.java:46) DEBUG NSLog - *** EOEditingContext: access when another thread holds a lock: _eoForGID()!
Mar 08 23:09:55 SMS[????] (ERXNSLogLog4jBridge.java:46) DEBUG NSLog - *** EODatabaseContext: access without lock!

.........

Mar 08 23:09:55 SMS[????] (ERXNSLogLog4jBridge.java:43) WARN NSLog - <WOWorkerThread id=57 socket=Socket[addr=/ 127.0.0.1,port=????,localport=????]> Exception occurred while responding to client: java.lang.IllegalStateException: Illegal Lock usage: unlocking thread not owner.
java.lang.IllegalStateException: Illegal Lock usage: unlocking thread not owner.
at com.webobjects.foundation.NSRecursiveLock.unlock(NSRecursiveLock.java: 207)
at com .webobjects .eocontrol .EOObjectStoreCoordinator.unlock(EOObjectStoreCoordinator.java:516)
at com .webobjects .eocontrol.EOEditingContext.unlockObjectStore(EOEditingContext.java: 4753)
at com .webobjects .eocontrol.EOEditingContext.refaultObject(EOEditingContext.java:4011)
at er.extensions.eof.ERXEC.refaultObject(ERXEC.java:1098)
at com .webobjects .eocontrol.EOEditingContext.refaultObject(EOEditingContext.java:4062)
at er.extensions.eof.ERXEC.refaultObject(ERXEC.java:1098)
at com .webobjects .eocontrol .EOEditingContext ._newChangesFromInvalidatingObjectsWithGlobalIDs(EOEditingContext.java: 3520)
at com .webobjects .eocontrol .EOEditingContext._processObjectStoreChanges(EOEditingContext.java:3558)
at sun.reflect.GeneratedMethodAccessor228.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector.invoke(NSSelector.java:354)
at com .webobjects.foundation.NSSelector._safeInvokeSelector(NSSelector.java: 108)
at com .webobjects .eocontrol .EOEditingContext._sendOrEnqueueNotification(EOEditingContext.java:4784)
at com .webobjects .eocontrol .EOEditingContext._objectsChangedInStore(EOEditingContext.java:3598)
at er.extensions.eof.ERXEC._objectsChangedInStore(ERXEC.java:1285)
at sun.reflect.GeneratedMethodAccessor227.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector._safeInvokeMethod(NSSelector.java: 120)
at com.webobjects.foundation.NSNotificationCenter $_Entry.invokeMethod(NSNotificationCenter.java:601)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:545)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:575)
at com .webobjects .eocontrol .EOEditingContext._processRecentChanges(EOEditingContext.java:1886)
at com .webobjects .eocontrol.EOEditingContext.processRecentChanges(EOEditingContext.java: 1951)
at er.extensions.eof.ERXEC.processRecentChanges(ERXEC.java:659)
at com .webobjects .eocontrol .EOEditingContext._processEndOfEventNotification(EOEditingContext.java: 2213)
at com .webobjects .eocontrol .EOEditingContext._undoManagerCheckpoint(EOEditingContext.java:1956)
at sun.reflect.GeneratedMethodAccessor242.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector._safeInvokeMethod(NSSelector.java: 120)
at com.webobjects.foundation.NSNotificationCenter $_Entry.invokeMethod(NSNotificationCenter.java:601)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:545)
at com .webobjects .foundation .NSNotificationCenter.postNotification(NSNotificationCenter.java:559)
at com .webobjects .foundation .NSUndoManager._postCheckpointNotification(NSUndoManager.java:264)
at com .webobjects .foundation.NSUndoManager.endUndoGrouping(NSUndoManager.java:416)
at com .webobjects .foundation .NSUndoManager._processEndOfEventNotification(NSUndoManager.java:254)
at sun.reflect.GeneratedMethodAccessor304.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSSelector.invoke(NSSelector.java:354)
at com .webobjects.foundation.NSSelector._safeInvokeSelector(NSSelector.java: 108)
at com.webobjects.foundation.NSDelayedCallbackCenter $NSLightInvocation.invoke(NSDelayedCallbackCenter.java:242)
at com .webobjects .foundation .NSDelayedCallbackCenter._eventEnded(NSDelayedCallbackCenter.java:208)
at com .webobjects .foundation .NSDelayedCallbackCenter.eventEnded(NSDelayedCallbackCenter.java:171)
at com .webobjects .appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:184)
at com .webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java: 254)
at java.lang.Thread.run(Thread.java:613)


tia

Paul - Treasuremytext.com

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