Well, as it turns out all my fault as another backup process I have kicked in 
and interfered with my reprocessing. After I synchronized these two competing 
resources everything runs as smooth as usual again. 

Sorry for bothering but we are close to end of our release cycle ;)
-Andreas

P.S.
Neo rocks!

> -----Ursprüngliche Nachricht-----
> Von: "Andreas Guenther" <andreas.guent...@web.de>
> Gesendet: 11.11.09 20:57:51
> An: user@lists.neo4j.org
> Betreff: [Neo] NPE during XA transaction


> Hi,
> 
> I am trying to reprocess requests available from a queue into my neo store. I 
> intentionally avoid using the bulk load feature. The idea behind the feature 
> is to have the ability synchronizing neo with the database in case neo missed 
> transactions and also to be able to reconstruct the store from scratch if 
> needed. Everything works just fine when processing the queue in production, 
> that is, where requests come in infrequently, all distributed during the day. 
> It unfortunately fails when trying to reprocess them in fast order. It 
> consistently happens after approx 2000 processing requests.
> 
> Any idea what could have caused the NPE as pasted below? Looks like the 
> 'LogBuffer writeBuffer' got assigned to NULL at one point, probably during 
> either releaseCurrentLogFile() or close(). Anything related to log rotation, 
> maybe? This happens on Linux with Neo4j 1.0-b10.
> 
> Any workarounds or explanations appreciated,
> -Andreas
> 
> org.neo4j.impl.transaction.TransactionFailureException: Unable to commit 
> transaction
> ...
> Caused by: java.lang.NullPointerException
>         at 
> org.neo4j.impl.transaction.xaframework.XaLogicalLog.done(XaLogicalLog.java:462)
>         at 
> org.neo4j.impl.transaction.xaframework.XaResourceManager.commit(XaResourceManager.java:400)
>         at 
> org.neo4j.impl.transaction.xaframework.XaResourceHelpImpl.commit(XaResourceHelpImpl.java:64)
>         at 
> org.neo4j.impl.transaction.TransactionImpl.doCommit(TransactionImpl.java:514)
>         at org.neo4j.impl.transaction.TxManager.commit(TxManager.java:573)
>         at org.neo4j.impl.transaction.TxManager.commit(TxManager.java:543)
>         at 
> org.neo4j.impl.transaction.TransactionImpl.commit(TransactionImpl.java:102)
>         at 
> org.neo4j.api.core.EmbeddedNeoImpl$TransactionImpl.finish(EmbeddedNeoImpl.java:395)
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