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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.engine.spi.ActionQueue.executeActions(ActionQueue.java:353)	at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:279)	at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326)	at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)	at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1214)	at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:986)