org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity

原因：没有配置实体映射entity

1. <!--SessionFactory Definition-->  
2. <bean id="sessionFactory"  
3.     class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">  
4.     <property name="dataSource"><ref local="dataSource" /></property>  
5.     <property name="lobHandler" ref="lobHandler" />  
6.     <property name="hibernateProperties">  
7.         <props>  
8.             <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>  
9.             <prop key="hibernate.show_sql">true</prop>  
10.         </props>  
11.     </property>  
12.     <property name="mappingDirectoryLocations">  
13.         <list>  
14.             <value>classpath*:com/momo/example/entity</value>  
15.             <value>classpath*:com/momo/tools/document/entity</value>  
16.         </list>  
17.     </property>  
18. </bean>