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org.dom4j.tree.DefaultElement cannot be cast to org.hibernate.collection.PersistentCollection
java.lang.ClassCastException: org.dom4j.tree.DefaultElement	at org.hibernate.event.def.DirtyCollectionSearchVisitor.processCollection(DirtyCollectionSearchVisitor.java:50)	at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:104)	at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:64)	at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:58)	at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:301)	at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:111)	at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:190)	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:70)	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:730)	at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:329)	at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86)	at TestDom4jVersionedObject.main(TestDom4jVersionedObject.java:26)