工作总结：org.springframework.orm.hibernate3.LocalSessionFactoryBean的疑惑解决办法

使用xml 配置的hibernate配置信息后，事例如下：

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource"></property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect" >org.hibernate.dialect.SQLServerDialect</prop> <prop key="hibernate.jdbc.batch_size">20</prop> <prop key="hibernate.show_sql">true</prop> </props> </property> <property name="mappingResources"> <list> <value>com/jw/pojo/JwUser.hbm.xml</value> </list> </property> </bean>

在junit4中定义了一个测试

@Test public void beanSessionFactoryTest(){ LocalSessionFactoryBean sessionFactory=(LocalSessionFactoryBean)appContext.getBean("sessionFactory"); }

运行测试的时候报了一个异常

Testcase: beanSessionFactoryTest(com.test.spring.SpringBeanTest): Caused an ERROR org.hibernate.impl.SessionFactoryImpl cannot be cast to org.springframework.orm.hibernate3.LocalSessionFactoryBean java.lang.ClassCastException: org.hibernate.impl.SessionFactoryImpl cannot be cast to org.springframework.orm.hibernate3.LocalSessionFactoryBean

问题分析：

　　LocalSessionFactoryBean实现了org.springframework.beans.factory.FactoryBean接口, spring在装配的时候, 如果发现实现了org.springframework.beans.factory.FactoryBean接口, 就会使用FactoryBean#getObject() 方法返回的对象装配,具体的可以看下文档. 　　如果你想拿到LocalSessionFactoryBean实例, 在id前面加个'&'就可以了,在你的配置文件中BeanFactory.getBean('&sessionFactory')拿到的就是LocalSessionFactoryBean的实例.

解决方法：

1、取真实的LocalSessionFactoryBean 实例对象

ClassPathXmlApplicationContext cpx=new ClassPathXmlApplicationContext("beans.xml"); LocalSessionFactoryBean sessionFactory=(LocalSessionFactoryBean)cpx.getBean("&sessionFactory"); System.out.println("step3 sessionFactory=" + sessionFactory );

2、取SessionFactoryImpl 对象（即Hibernate的SessionFactory的具体实现类）

SessionFactoryImpl sessionFactoryImpl = (SessionFactoryImpl) applicationContext.getBean("sessionFactory");