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org.hibernate.MappingException: Unknown entity: com.hibernate.submission.Student	at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(	at org.hibernate.event.def.DefaultLoadEventListener.onLoad(	at org.hibernate.impl.SessionImpl.fireLoad(	at org.hibernate.impl.SessionImpl.load(	at org.hibernate.impl.SessionImpl.load(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(	at undefined.$Proxy9.load(Unknown Source)	at com.hibernate.submission.TestCollege.deleteStudent(	at	at com.hibernate.submission.TestCollege.main(