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org.hibernate.MappingException: Unknown entity: org.hibernate.impl.SessionImpl	at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:548)	at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)	at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:96)	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)	at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)	at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)	at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)	at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)	at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)	at beans.Test.main(Test.java:24)