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org.hibernate.MappingException: Unknown entity: bbb.Students	at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)	at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1533)	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)	at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)	at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)	at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:682)	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:674)	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:669)	at bbb.App.main(App.java:39)