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net.sf.hibernate.AssertionFailure: Hibernate has a bug processing collections	at net.sf.hibernate.impl.SessionImpl.prepareCollectionForUpdate(SessionImpl.java:2635)	at net.sf.hibernate.impl.SessionImpl.updateReachableCollection(SessionImpl.java:2556)	at net.sf.hibernate.impl.SessionImpl.updateReachable(SessionImpl.java:2577)	at net.sf.hibernate.impl.SessionImpl.updateReachables(SessionImpl.java:2682)	at net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2259)	at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2017)	at net.sf.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:1560)	at net.sf.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:1372)	at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1332)	at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1322)