org.hibernate.MappingException: Unknown entity异常是新手学习hibernate的时候经常遇到的问题，这值得注意一下。下边是异常截图
org.hibernate.MappingException: Unknown
1、org.hibernate.MappingException: Unknown entity异常详细信息如下：org.hibern锾攒揉敫ate.MappingException: Unknown entity: com.gis520.model.Emp_emp at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:628) at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1366) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)………… at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
解决方案：
1、原因分析1：可能是因为使用注解的时候没有导入正确的包。要清楚，Entity包是javax.persistence.Entity;而不是hibernate包下的annotation
2、原因分析2：使用注解时没有在*.cfg.xml下配置<mapping class=""/>,从而造成org.hibernate.MappingException: Unknown entity异常的原因
3、org.hibernate.MappingException: Unknown entity解决方法就是以上两个原因。如果你使用注鞅瓞慈玢解，上边的两个一定要正确。如果是使用的是*.hbm.xml文件，则查看*.hbm.xml是否加入了引用即可。排除后即可解决异常。
