org.apache.ibatis.binding.BindingException: Mapper method 'com.easy.demo.mapper.UserMapper.loginUser attempted to return null from a method with a primitive return type (int).报错怎么解决？

Question

@RequestMapping(value = {"/loginUser"},method = RequestMethod.GET)
        public void login(User user, HttpServletRequest request, HttpSession session) throws UnsupportedEncodingException, NoSuchAlgorithmException {
            int i=0;
            String s=user.getPassword();
            String md=HexUtil.getEncryptedPwd(s);
            //对比数据库密码
            user.setPassword(md);
            try {
                i=userMapper.loginUser(user);
            }catch (Exception e){
                e.printStackTrace();
            }
            System.out.println(i);
            if (i==1){
                System.out.println("账号或密码输入错误");
            }else {
                System.out.println("登陆成功");
            }
        }

userMapper里的loginUser定义是：int loginUser(User user);
userService里的loginUser：void loginUser(User user);
userServiceImpl里的loginUser：@Override
public void addUser(User user) {

    userMapper.addUser(user);
}

不论密码的对错，运行报错输出的i值始终为0，谁能帮我看看怎么解决

Answer 1

你userMapper里的loginUser是怎么写的啊，返回的结果是什么