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[CDO] NPE from CDOResourceFolder conflict? [message #1060233]

Thu, 23 May 2013 11:58

Eclipse User

Hello again!

I was in desperate need of some conflict resolving mechanisms, so I updated to the RC's of EMF and CDO. Before I start, thanks for all of the updates in that area! Smile

I'm running into a NPE using the CDOMergingConflictResolver. The thing that confuses me about this situation is that I'm not modifying the same objects on either client. The situation that causes this is as follows:

1. Client 1 modifies an object a.
2. Client 2 modifies an object b.
3. Client 1 commits.
4. Client 2 receives the NPE.
5. Client 2 upon trying to commit cannot due to a conflict on the "CDOResourceFolder".

Am I doing something incorrectly? I have never seen reference to a CDOResourceFolder object before. This is the stacktrace, line 139 is "remoteDelta.apply(newCleanRevision);".

java.lang.NullPointerException
	at org.eclipse.emf.spi.cdo.CDOMergingConflictResolver.resolveConflicts(CDOMergingConflictResolver.java:139)
	at org.eclipse.emf.internal.cdo.transaction.CDOTransactionImpl.handleConflicts(CDOTransactionImpl.java:743)
	at org.eclipse.emf.internal.cdo.view.CDOViewImpl.doInvalidate(CDOViewImpl.java:883)
	at org.eclipse.emf.internal.cdo.view.CDOViewImpl$InvalidationRunnable.run(CDOViewImpl.java:1661)
	at org.eclipse.net4j.util.concurrent.QueueRunner.work(QueueRunner.java:26)
	at org.eclipse.net4j.util.concurrent.QueueRunner.work(QueueRunner.java:1)
	at org.eclipse.net4j.util.concurrent.QueueWorker.doWork(QueueWorker.java:88)
	at org.eclipse.net4j.util.concurrent.QueueWorker.work(QueueWorker.java:79)
	at org.eclipse.net4j.util.concurrent.Worker$WorkerThread.run(Worker.java:206)

Thanks in advance!

Re: [CDO] NPE from CDOResourceFolder conflict? [message #1060479 is a reply to message #1060233]

Sat, 25 May 2013 02:57

Eclipse User

Hi Jack,

I'm still working on the CDOMergingConflictResolver because it's not fully implemented, yet. I know it's late in the
cycle but please wait until all the related bugzillas are resolved and then try again. If exception do still occur then,
please submit a bugzilla, so that I can handle it quickly.

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Am 23.05.2013 17:58, schrieb Jack Lechner:
> Hello again!
>
> I was in desperate need of some conflict resolving mechanisms, so I updated to the RC's of EMF and CDO. Before I
> start, thanks for all of the updates in that area! :)
>
> I'm running into a NPE using the CDOMergingConflictResolver. The thing that confuses me about this situation is that
> I'm not modifying the same objects on either client. The situation that causes this is as follows:
>
> 1. Client 1 modifies an object a.
> 2. Client 2 modifies an object b.
> 3. Client 1 commits.
> 4. Client 2 receives the NPE.
> 5. Client 2 upon trying to commit cannot due to a conflict on the "CDOResourceFolder".
>
> Am I doing something incorrectly? I have never seen reference to a CDOResourceFolder object before. This is the
> stacktrace, line 139 is "remoteDelta.apply(newCleanRevision);".
>
> java.lang.NullPointerException
> at org.eclipse.emf.spi.cdo.CDOMergingConflictResolver.resolveConflicts(CDOMergingConflictResolver.java:139)
> at org.eclipse.emf.internal.cdo.transaction.CDOTransactionImpl.handleConflicts(CDOTransactionImpl.java:743)
> at org.eclipse.emf.internal.cdo.view.CDOViewImpl.doInvalidate(CDOViewImpl.java:883)
> at org.eclipse.emf.internal.cdo.view.CDOViewImpl$InvalidationRunnable.run(CDOViewImpl.java:1661)
> at org.eclipse.net4j.util.concurrent.QueueRunner.work(QueueRunner.java:26)
> at org.eclipse.net4j.util.concurrent.QueueRunner.work(QueueRunner.java:1)
> at org.eclipse.net4j.util.concurrent.QueueWorker.doWork(QueueWorker.java:88)
> at org.eclipse.net4j.util.concurrent.QueueWorker.work(QueueWorker.java:79)
> at org.eclipse.net4j.util.concurrent.Worker$WorkerThread.run(Worker.java:206)
>
> Thanks in advance!

Re: [CDO] NPE from CDOResourceFolder conflict? [message #1062085 is a reply to message #1060233]

Wed, 05 June 2013 15:44

Eclipse User

I found that this was actually not the conflict resolver's problem. It ended up that another part of my code was accessing a resource manager.

Thank you for your help though!

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