Hibernate无法映射

Question

org.hibernate.MappingException: Unknown entity: Student at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:684) at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1692) at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:122) 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:709) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:701) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:696) at Student.main(Student.java:92)