spring3.1使用JDBC数据源datasource的错误问题

JAR包：
junit-4.10.jar
org.springframework.beans-3.1.1.RELEASE.jar
org.springframework.context-3.1.1.RELEASE.jar
org.springframework.core-3.1.1.RELEASE.jar
org.springframework.asm-3.1.1.RELEASE.jar
org.springframework.expression-3.1.1.RELEASE.jar
org.springframework.jdbc-3.1.1.RELEASE.jar
commons-logging.jar
mysql-connector-java-5.1.18-bin.jar

1、User类

package com.model;



public class User {

	private int id;

	private String name;

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

}

2、UserDAO接口

package com.dao;



import com.model.User;



public interface UserDAO {

	public void save(User u);

}

3、UserDAOImpl实现类

package com.dao.impl;



import java.sql.Connection;

import java.sql.SQLException;

import javax.annotation.Resource;

import javax.sql.DataSource;

import org.springframework.stereotype.Component;



import com.dao.UserDAO;

import com.model.User;

@Component("userDAO")

public class UserDAOImpl implements UserDAO {

	

	private DataSource dataSource ;

	public DataSource getDataSource() {

		return dataSource;

	}

	@Resource(name="dataSource")

	public void setDataSource(DataSource dataSource) {

		this.dataSource = dataSource;

	}

	@Override

	public void save(User u) {



		try {

			Connection conn = dataSource.getConnection();

			conn.createStatement().executeUpdate("insert into user values(null,'lisi')");

			conn.close();

		} catch (SQLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		

		System.out.println("A user saved!");

		

	}

}

4、UserService类

package com.service;





import javax.annotation.Resource;



import org.springframework.stereotype.Component;



import com.dao.UserDAO;

import com.dao.impl.UserDAOImpl;

import com.model.User;



@Component("userService")

public class UserService {

	private UserDAO userDAO = new UserDAOImpl();



	public UserDAO getUserDAO() {

		return userDAO;

	}

	@Resource(name="userDAO")

	public void setUserDAO(UserDAO userDAO) {

		this.userDAO = userDAO;

	}

	

	public void add(User u) {

		userDAO.save(u);

	}

}

5、UserServiceTest测试类

package com.test;



import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;



import com.model.User;

import com.service.UserService;



public class UserServiceTest {

	@Test

	public void testAdd() {

		User u = new User();

		ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"beans.xml"});

		UserService userService = (UserService)context.getBean("userService");

		userService.add(u);

	}

}