关于Spring的@ExceptionHandler不执行的问题-java报错

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今天敲了会代码，想用@ExceptionHandler处理异常试试。

写好一段程序后，抛异常怎么也走不进@ExceptionHandler修饰的方法，大家帮忙看看。

package cn.net.bysoft.blackpearl.controller;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import cn.net.bysoft.blackpearl.entity.ResponseInfo;
import cn.net.bysoft.blackpearl.entity.User;
import cn.net.bysoft.blackpearl.exception.UserLockedException;
import cn.net.bysoft.blackpearl.exception.UserLoginFailException;
import cn.net.bysoft.blackpearl.service.UserService;

@RestController
@RequestMapping(value = { "/controller/users" })
public class UserController {

    @Autowired
    private UserService userService;

    @ExceptionHandler(UserLockedException.class)
    @ResponseStatus(HttpStatus.LOCKED)
    public ResponseInfo handlerUserLocked(UserLockedException userLockedException) {
        return new ResponseInfo(HttpStatus.LOCKED, userLockedException.getErrMsg());
    }

    @ExceptionHandler(UserLoginFailException.class)
    @ResponseStatus(HttpStatus.NOT_FOUND)
    public ResponseInfo handlerUserLoginFail(UserLockedException userLockedException) {
        System.out.println("123");
        return new ResponseInfo(HttpStatus.NOT_FOUND, userLockedException.getErrMsg());
    }

    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public ResponseInfo login(@RequestBody User user, HttpSession httpSession) {
        // 通过帐号和密码查询用户
        User currentUser = userService.findByEmailAndPassword(user);

        // 判断是否查询到了用户
        if (currentUser != null) {
            // 将用户设置在Session中
            httpSession.setAttribute("User", currentUser);
            // 判断用户是否被锁定
            if (!currentUser.isLocked()) {
                throw new UserLockedException("UserLocked", "您登录的帐号已被锁定。");
            }
        } else {
            // 登录失败
            throw new UserLoginFailException("UserNotFound", "帐号或密码不存在。");
        }
        // 登陆成功
        return new ResponseInfo(HttpStatus.OK);
    }

    @RequestMapping(value = "/current", method = RequestMethod.GET)
    public ResponseInfo getCurrentUser(HttpSession httpSession) {
        // 从Session中获得当前用户
        return new ResponseInfo(HttpStatus.OK, httpSession.getAttribute("User"));
    }

}