SSH 事务采用java5注解无法获取Service实例bean

SSH 事务采用java5注解无法获取Service实例bean  
我采用ssh JAVA5注解进行事务配置： <?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:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"
>
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="configLocation">
            <value>classpath:hibernate.cfg.xml</value>
        </property>
    </bean>
    
    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory">
            <ref bean="sessionFactory"/>
        </property>
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
service: 
package com.xxx.prjta.service.Impl;import java.util.List;import org.springframework.transaction.annotation.Transactional;import com.xx.prjta.dao.IProductsDAO;
import com.xx.prjta.dao.IProviderDAO;
import com.xx.prjta.po.Products;
import com.xx.prjta.service.IProductService;
import com.xx.prjta.utils.PageSupport;@Transactional
public class ProductService implements IProductService {
    private IProductsDAO productsDAO;
    private IProviderDAO providerDAO;
    
    public List<Products> queryProducts() {
        return productsDAO.findListByHSQL("from Products", null);
    }
    
    public PageSupport<Products> queryProducts(PageSupport<Products> ps) {
        return productsDAO.findPageSupportByHSQL("from Products", "select count(*) from Products", null, ps); 
    }
    
    public IProductsDAO getProductsDAO() {
        return productsDAO;
    }    public void setProductsDAO(IProductsDAO productsDAO) {
        this.productsDAO = productsDAO;
    }    public IProviderDAO getProviderDAO() {
        return providerDAO;
    }    public void setProviderDAO(IProviderDAO providerDAO) {
        this.providerDAO = providerDAO;
    }
}直接获取接口可以调用得到，但获取BEAN时就会提示出错： 
测试代码： 
String[] configLocations = {"applicationContext.xml", "userBeans.xml"}; 
ApplicationContext ctx = new ClassPathXmlApplicationContext(configLocations); 
IProductService proService = (IProductService)ctx.getBean("procductService"); 这样可以正常获取，可以得到事务并进行数据库操作。 
但这样时不行： String[] configLocations = {"applicationContext.xml", "userBeans.xml"}; 
ApplicationContext ctx = new ClassPathXmlApplicationContext(configLocations); 
ProductService proService = (ProductService )ctx.getBean("procductService"); 提示： 
Exception in thread "main" java.lang.ClassCastException: $Proxy5 cannot be cast to com.xxx.prjta.service.Impl.ProductService 
at com.xx.prjta.test.Test.main(Test.java:37) 
请问一下，使用 java5注解进行事务配置我该如何才能获取ProductService的bean实例啊？