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I am doing a JDO transaction on Google App Engine. Every now and then, 
whenever the transaction fails to commit (catching JDOCanRetryException) I 
see a logging entry saying:

SEVERE: Operation commit failed on resource: 
org.datanucleus.store.appengine.DatastoreXAResource@7eda34f5, error code 
UNKNOWN and transaction: [DataNucleus Transaction, ID=Xid=

Is this only a JDO logging thing or is it more critical I should be worrying 
about?

Thanks!

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