unknown entity MappingException: Unknown entity解决方案

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 entity异常详细信息如下：

org.hibernate.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)

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

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

MappingException: Unknown entity解决方案_exception

org.hibernate.MappingException: Unknown entity解决方法就是以上两个原因。如果你使用注解，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。

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