Re: EC locking error when allowing Finalizer thread to dispose

I think you can safely ignore that.

Chuck

On 2012-10-16, at 5:11 PM, David Moyer wrote:

> Hi all
> 
> I'm getting a few of the following EC locking errors in my log:
> 
> *** EOEditingContext: access with no lock: _eoForGID()!
> java.lang.Exception: Stack trace
> 	at java.lang.Thread.dumpStack(Thread.java:1176)
> 	at com.webobjects.eocontrol.LockErrorScreamerEditingContext._EOAssertSafeMultiThreadedAccess(Unknown Source)
> 	at com.webobjects.eocontrol.EOEditingContext._EOAssertSafeMultiThreadedReadAccess(EOEditingContext.java:5058)
> 	at com.webobjects.eocontrol.EOEditingContext._eoForGID(EOEditingContext.java:2632)
> 	at com.webobjects.eocontrol.EOEditingContext.editingContextDidForgetObjectWithGlobalID(EOEditingContext.java:3864)
> 	at er.extensions.eof.ERXEC.editingContextDidForgetObjectWithGlobalID(Unknown Source)
> 	at com.webobjects.eocontrol.EOEditingContext._processReferenceQueue(EOEditingContext.java:4764)
> 	at com.webobjects.eocontrol.EOEditingContext._registeredObjects(EOEditingContext.java:2316)
> 	at com.webobjects.eocontrol.EOEditingContext._dispose(EOEditingContext.java:1122)
> 	at com.webobjects.eocontrol.EOEditingContext.finalize(EOEditingContext.java:1239)
> 	at com.webobjects.eocontrol.LockErrorScreamerEditingContext.finalize(Unknown Source)
> 	at er.extensions.eof.ERXEC.finalize(Unknown Source)
> 	at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
> 	at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
> 	at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
> 	at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)
> 
> 
> Quite often the app will deadlock shortly after this error. I've noticed the following piece of code in the _dispose() method of EOEditingContext which I think explains it:
> 
> if( !duringFinalize )
> {
> 	lock();
> }
> allObjects = _registeredObjects();
> 
> So if the EC is being disposed of during a finalize, it wont lock itself before accessing its registered objects, leading to my error. This error doesn't occur if I dispose of the EC manually using dispose()
> Has anyone encountered this before?
> 
> Not sure if it's relevant, but I have ERX safe locking enabled (er.extensions.ERXEC.safeLocking=true)
> 
> Thanks,
> David
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-- 
Chuck Hill             Senior Consultant / VP Development

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Download AppDynamics Lite for free today:
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