Mingyang.net：註解配置Hibernate時報錯Unknown Entity

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註解配置時報錯：org.hibernate.MappingException: Unknown entity: net.mingyang.cms.bean.User

org.hibernate.MappingException: Unknown entity: net.mingyang.cms.bean.User    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1096)    at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1443)    at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:242)    at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:511)    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:100)    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:684)    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:676)    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:671)    at net.mingyang.cms.dao.hibernate.UserDaoHibernate.updateUser(UserDaoHibernate.java:34)    at net.mingyang.cms.service.impl.UserServiceImpl.updateUser(UserServiceImpl.java:50)    at net.mingyang.cms.controller.UserController.indexAction(UserController.java:61)    . . . . . .

可能的原因：
1、配置實體類時為@Entity導包時錯誤的匯入了 rg.hibernate.annotations.Entity ，應該更改為import javax.persistence.Entity;
2、applicationContext.xml中配置實體掃描時路徑出錯， 比如：實體類存放在net.mingyang.cms.bean包下，則路徑就要配為

<property name="packagesToScan" value="net.mingyang.cms.*"/>

而不是 

<property name="packagesToScan" value="net.mingyang.cms.bean.*"/>

也就是說配置映射目錄要比實際少一層。 
或者直接使用 

<property name="annotatedClasses">    <list>        <value>net.mingyang.cms.bean.User</value>        ......    </list></property> 

指定相應的實體類（實體類較少時）。