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java.lang.NullPointerException at org.hibernate.engine.EntityEntry.getLoadedValue(EntityEntry.java:141) at org.hibernate.type.CollectionType.getKeyOfOwner(CollectionType.java:302) at org.hibernate.engine.Collections.processReachableCollection(Collections.java:137) at org.hibernate.event.def.FlushVisitor.processCollection(FlushVisitor.java:37) 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.onFlushEntity(DefaultFlushEntityEventListener.java:198) 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:324) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86)