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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