sequence of JPA operations:

1. Select nextvalue from sequernce (HHH-7543.log: line 15)
2. Insert record to table (HHH-7543.log: line 90)
3. Select nextvalue from envers sequernce (HHH-7543.log: line 162)
4. Insert record to envers table (HHH-7543.log: line 232)
5. Insert record to audit table (HHH-7543.log: line 279)
6. some batch action
7. Upsert record in table (HHH-7543.log: line 3077)
8. {{2012-08-22 18:36:18,423 ERROR - {SynchronizationCallbackCoordinatorImpl} - HHH000346: Error during managed flush [null]
   }} - the NullPointerException not logged, all you see in the log is *[null]*. See org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl line LOG.unableToPerformManagedFlush( failure.getMessage() );