Mingyang.net：注解配置Hibernate时报错Unknown Entity

注解配置时报错：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、配置实体类时为@Entity导包时错误的导入了 rg.hibernate.annotations.Entity ，应该更改为import javax.persistence.Entity;
2、applicationContext.xml中配置实体扫描时路径出错， 比如：实体类存放在net.mingyang.cms.bean包下，则路径就要配为

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

而不是

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

也就是说配置映射目录要比实际少一层。 
或者直接使用

<property name="annotatedClasses">

    <list>

        <value>net.mingyang.cms.bean.User</value>

        ......

    </list>

</property> 

指定相应的实体类（实体类较少时）。