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

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at net.sf.hibernate.collection.Set.entries(
at net.sf.hibernate.collection.AbstractCollectionPersister.recreate(
at net.sf.hibernate.impl.ScheduledCollectionRecreate.execute(
at net.sf.hibernate.impl.SessionImpl.executeAll(
at net.sf.hibernate.impl.SessionImpl.execute(
at net.sf.hibernate.impl.SessionImpl.flush(

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