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Re: SharedEditingContext error in WO 5.4
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Re: SharedEditingContext error in WO 5.4


  • Subject: Re: SharedEditingContext error in WO 5.4
  • From: Chuck Hill <email@hidden>
  • Date: Wed, 2 Jan 2008 11:46:39 -0800

I don't know. I will guess that in 5.4 the initialization of the default shared editing context has been postponed until after the Application constructor completes. Does that code below work if you do that fetch somewhere else in your code?

Chuck

On Jan 2, 2008, at 10:37 AM, Ralf Schuchardt wrote:

Hello,

are there any known fundamental changes (or bugs) in the handling of SharedEditingContexts in WO 5.4?
I have an application that has worked flawlessly with SharedEditingContexts enabled in WO 5.3, but in 5.4 I get a strange locking error when fetching objects.


I have this simple (test) code in Application():

EOEditingContext ec = new EOEditingContext();
ec.lock();
try {
EOFetchSpecification fetch = new EOFetchSpecification ("Kumulativdaten", null, null);
NSArray ks = ec.objectsWithFetchSpecification(fetch);
}
finally {
ec.unlock();
ec.dispose();
}


The entity "Kumulativdaten" has relationships to shared objects (entities with "share all objects" set). I don't have any explicit calls to EOEditingContext.sharedEditingContext or EOSharedEditingContext.defaultSharedEditingContext.

The code runs fine with WO 5.3 and fetches the objects, but with 5.4 I get this error:

[2008-1-2 17:32:50 CET] <main> java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantReadWriteLock $Sync.tryRelease(ReentrantReadWriteLock.java:259)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release (AbstractQueuedSynchronizer.java:1137)
at java.util.concurrent.locks.ReentrantReadWriteLock $WriteLock.unlock(ReentrantReadWriteLock.java:821)
at com.webobjects.eocontrol.EOSharedEditingContext.unlock (EOSharedEditingContext.java:787)
at com.webobjects.eocontrol.EOEditingContext.unlockObjectStore (EOEditingContext.java:4670)
at com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecificatio n(EOEditingContext.java:4057)
at com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecificatio n(EOEditingContext.java:4428)
at com.jip.bluter.Application.<init>(Application.java:71)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance (NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance (DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at java.lang.Class.newInstance0(Class.java:350)
at java.lang.Class.newInstance(Class.java:303)
at com.webobjects.appserver.WOApplication.main(WOApplication.java: 546)
at com.jip.bluter.Application.main(Application.java:45)


Somehow the shared EditingContext is not properly initialized or locked, because the exception seems to indicate a missing lock.
I can prevent the error by a simple call to EOSharedEditingContext.defaultSharedEditingContext() prior to creating my EditingContext.


Is it really necessary to manually instantiate the SharedEditingContext or could this be a bug in WO 5.4?

Thanks,
Ralf Schuchardt
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References: 
 >SharedEditingContext error in WO 5.4 (From: Ralf Schuchardt <email@hidden>)

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