Illegal modifier for parameter userMapper; only final is permitted

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报错的原因是

 package com.chen.service.impl;

 import java.io.IOException;

 import java.io.InputStream;

 import org.apache.catalina.User;

 import org.apache.ibatis.io.Resources;

 import org.apache.ibatis.session.SqlSession;

 import org.apache.ibatis.session.SqlSessionFactory;

 import org.apache.ibatis.session.SqlSessionFactoryBuilder;

 import org.springframework.context.ApplicationContext;

 import org.springframework.context.support.ClassPathXmlApplicationContext;

 import com.chen.mapper.UserMapper;

 import com.chen.service.UserService;

 public class UserServiceImpl implements UserService{

     //声明mapper变量

     private UserMapper userMapper;//这行代码如果要加private修饰的话，就不能放在下面的代码中

     public User userLoginService(String uname, String pwd) throws IOException {

         //获取sqlsession对象

 /*        InputStream is = Resources.getResourceAsStream("MyBatis.xml");

         SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);

         SqlSession ss = factory.openSession();

         //获取Mapper接口实例化对象

         UserMapper um=ss.getMapper(UserMapper.class);*/

         //当我们在applicationcontext中配置好mybatis后，就不用再像上面一样进行方法调用，获取实例化对象

         //获取spring容器对象

 /*        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationcontext.xml");

         UserMapper um = (UserMapper) ac.getBean("userMapper");//mapper实例化接口的类名首字母小写即是Bean id

         已经在servlet获取过一次spring容器对象了，所以我们没必要再获取一次

         */

         //操作数据库

         return (User) userMapper.selUser(uname, pwd);

     }

 }