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

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java.lang.NullPointerException:
at net.sf.hibernate.persister.NormalizedEntityPersister.getIdentifierColumnNames(NormalizedEntityPersister.java:1075)
at net.sf.hibernate.persister.AbstractEntityPersister.(AbstractEntityPersister.java:699)
at net.sf.hibernate.persister.NormalizedEntityPersister.(NormalizedEntityPersister.java:646)
at net.sf.hibernate.persister.PersisterFactory.create(PersisterFactory.java:32)
at net.sf.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:137)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:647)

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