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Re: [JC] update conflict handling
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Re: [JC] update conflict handling

  • Subject: Re: [JC] update conflict handling
  • From: Chuck Hill <email@hidden>
  • Date: Fri, 10 Jul 2009 20:32:44 -0700
Hi Flor,


On Jul 10, 2009, at 10:32 AM, Stamenkovic Florijan wrote:

Hi all,

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

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

That is a little misleading. It only applies to OL conflicts across instances (or EOF stacks).


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?

Well, not really. This is one of the very rare instances when I get to observe that JC is actually more sophisticated in this area than regular WO is. Regular WO just silently merges the changes from other editing contexts (problematic when the other EC is form another session). It looks like JC actually catches this and, at least sort of, handles it.

Somehow, you are going to have to handle this earlier than expected. I am not sure how. You could try the documentation. :-P


Chuck



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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--
Chuck Hill             Senior Consultant / VP Development

Learn WO at WOWODC'09 East in Montréal this August!
http://www.wocommunity.org/wowodc09/east

http://arstechnica.com/apple/news/2009/07/webobjects-sliced-from-106but-prognosis-of-death-premature.ars

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 >[JC] update conflict handling (From: Stamenkovic Florijan <email@hidden>)






    

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