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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(	at java.util.AbstractList$	at org.hibernate.engine.spi.ActionQueue.executeActions(	at org.hibernate.engine.spi.ActionQueue.executeActions(	at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(	at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(	at org.hibernate.internal.SessionImpl.flush(	at org.hibernate.ejb.AbstractEntityManagerImpl.flush(