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

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at net.sf.hibernate.persister.NormalizedEntityPersister.getIdentifierColumnNames(
at net.sf.hibernate.persister.AbstractEntityPersister.(
at net.sf.hibernate.persister.NormalizedEntityPersister.(
at net.sf.hibernate.persister.PersisterFactory.create(
at net.sf.hibernate.impl.SessionFactoryImpl.(
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(

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