java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at net.sf.hibernate.collection.Set.entries(Set.java:254)
at net.sf.hibernate.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:512)
at net.sf.hibernate.impl.ScheduledCollectionRecreate.execute(ScheduledCollectionRecreate.java:23)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2407)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2364)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2229)

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