关于ssh的$Proxy0 cannot be cast to 报错

[wrweirong]

报错：Exception in thread "main" java.lang.ClassCastException: $Proxy0 cannot be cast to com.wr.domain.User
度娘了，说解决方法有两种 1、给service类添加一个接口iService，让service类实现它，则创建代理类时使用JDK动态代理就不会出现问题 2、设置beanNameAutoProxyCreator的proxyTargetClass属性为true，意思是强制使用CGLIB代理，前提是你已经将CGLIB包加入到项目中
第一种方法我已经做了，但是第二种方法我不会怎么弄。

贴上代码，大神帮忙啊，急急！！！
测试文件Test

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        User u = (User)ac.getBean("userServiceImpl");
        
        u.setId("101");
        u.setPwd("101");
        
        UserServiceImpl userServiceImpl = new UserServiceImpl();
        userServiceImpl.addUser(u);
        
    }

}

applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">


    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="configLocation"
            value="classpath:hibernate.cfg.xml">
        </property>
    </bean>
    <!-- applicationContext.xml事务管理器的配置 -->
    <bean id="txManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory">
            <!-- 注入applicationContext.xml中配置的sessionFactory -->
            <ref bean="sessionFactory" />
        </property>
    </bean>
    <!-- dao -->
    <bean id="UserDaoImpl" class="com.wr.dao.impl.UserDaoImpl">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>
    <!-- service -->
    <bean id="userServiceImpl" class="com.wr.service.impl.UserServiceImpl">
        <property name="userDao" ref="UserDaoImpl"></property>
    </bean>
    <!-- action -->
    <bean name="addUserAction" class="com.wr.action.addUserAction">
        <property name="userServiceImpl" ref="userServiceImpl"></property>
    </bean>
    <!-- 事务通知的配置 -->
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <!-- 对do开头的方法要求事务 -->
            <tx:method name="add*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <!-- 对其他方法的配置 -->
            <tx:method name="*" propagation="SUPPORTS" read-only="true" />

        </tx:attributes>
    </tx:advice>
    <!-- 将事务通知和切入点组合 -->
    <aop:config>
        <aop:pointcut expression="execution(* com.wr.service.impl.*.*(..))" id="pc" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pc" />
    </aop:config>
</beans>