java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at org.hibernate.ogm.persister.Dehydrator.doRemovePropertyMetadata(Dehydrator.java:219)
at org.hibernate.ogm.persister.Dehydrator.dehydrate(Dehydrator.java:140)
at org.hibernate.ogm.persister.OgmEntityPersister.dehydrate(OgmEntityPersister.java:784)
at org.hibernate.ogm.persister.OgmEntityPersister.update(OgmEntityPersister.java:747)
at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:113)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
at pt.ist.fenixframework.example.bankbench.hib.HibTxSystem.doIt(HibTxSystem.java:85)
at pt.ist.fenixframework.example.bankbench.TxCommand.run(TxCommand.java:14)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

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