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org.hibernate.MappingException: Unknown entity: com.hibernate.submission.Student	at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:628)	at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:91)	at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:906)	at org.hibernate.impl.SessionImpl.load(SessionImpl.java:823)	at org.hibernate.impl.SessionImpl.load(SessionImpl.java:816)	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(ThreadLocalSessionContext.java:342)	at $Proxy9.load(Unknown Source)	at com.hibernate.submission.TestCollege.deleteStudent(TestCollege.java:70)	at com.hibernate.submission.TestCollege.design(TestCollege.java:63)	at com.hibernate.submission.TestCollege.main(TestCollege.java:57)