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[JC] update conflict handling
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[JC] update conflict handling

  • Subject: [JC] update conflict handling
  • From: Stamenkovic Florijan <email@hidden>
  • Date: Fri, 10 Jul 2009 13:32:16 -0400
Hi all,

I am implementing update conflict handling based on the info here:

http://developer.apple.com/documentation/webobjects/Enterprise_Objects/UpdateStrategies/UpdateStrategies.html

However, it seems that in a JavaClient scenario the update fails before saveChanges() is ever called on an editing context being saved. This means that I can't use an overridden saveChanges() in an EC subclass to catch the adaptor exception caused by the conflict, nor can I use the context delegate to deal with the exception. So, I am not sure where to intercept the exception... Or how to deal with this... Perhaps someone has some experience / an idea about this?

Below is the server side stack trace of the update exception...

TIA,
F


[2009-7-10 17:20:38 GMT-00:04] <WorkerThread10> Server exception: Optimistic locking failure: The object with global ID _EOIntegralKeyGlobalID[Company (java.lang.Integer)23] has been changed by another client
[2009-7-10 17:20:38 GMT-00:04] <WorkerThread10> java.lang.IllegalStateException: Optimistic locking failure: The object with global ID _EOIntegralKeyGlobalID[Company (java.lang.Integer)23] has been changed by another client
at com .webobjects .eodistribution .EODistributionContext ._throwOptimisticLockingFailureForGlobalIDIfNecessary (EODistributionContext.java:829)
at com .webobjects .eodistribution .common ._EOSavingProxy.replacementEOInEditingContext(_EOSavingProxy.java:156)
at com .webobjects .eodistribution .EODistributionContext ._replacementObjectForDecodedObject(EODistributionContext.java:882)
at sun.reflect.GeneratedMethodAccessor4.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: 122)
at com.webobjects.foundation._NSDelegate._perform(_NSDelegate.java:223)
at com.webobjects.foundation._NSDelegate.perform(_NSDelegate.java:159)
at com .webobjects .eodistribution .common ._EOReferenceRecordingCoder .decodeObject(_EOReferenceRecordingCoder.java:619)
at com .webobjects .eodistribution .common ._EOReferenceRecordingCoder .decodeObjects(_EOReferenceRecordingCoder.java:649)
at com.webobjects.foundation.NSArray.decodeObject(NSArray.java:1326)
at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.eodistribution.common._EOReferenceRecordingCoder $_Decoder.decodeObject(_EOReferenceRecordingCoder.java:767)
at com .webobjects .eodistribution .common ._EOReferenceRecordingCoder .decodeObject(_EOReferenceRecordingCoder.java:611)
at com .webobjects .eodistribution .common ._EOReferenceRecordingCoder .decodeObjects(_EOReferenceRecordingCoder.java:649)
at com .webobjects .eodistribution .common._EOServerInvocation.decodeObject(_EOServerInvocation.java:66)
at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.eodistribution.common._EOReferenceRecordingCoder $_Decoder.decodeObject(_EOReferenceRecordingCoder.java:767)
at com .webobjects .eodistribution .common ._EOReferenceRecordingCoder .decodeObject(_EOReferenceRecordingCoder.java:611)
at com .webobjects .eodistribution .common ._EOReferenceRecordingCoder .decodeObjects(_EOReferenceRecordingCoder.java:649)
at com.webobjects.foundation.NSArray.decodeObject(NSArray.java:1326)
at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.eodistribution.common._EOReferenceRecordingCoder $_Decoder.decodeObject(_EOReferenceRecordingCoder.java:767)
at com .webobjects .eodistribution .common ._EOReferenceRecordingCoder .decodeObject(_EOReferenceRecordingCoder.java:611)
at com .webobjects .eodistribution .EODistributionContext .responseToClientMessage(EODistributionContext.java:560)
at com .webobjects .eodistribution .WOJavaClientComponent.handleClientRequest(WOJavaClientComponent.java: 1148)
at com .webobjects .eodistribution .WOJavaClientComponent.invokeAction(WOJavaClientComponent.java:445)
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.WOComponent.invokeAction(WOComponent.java: 1079)
at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357)
at com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java: 1745)
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 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:613)
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