关于Spring的@ExceptionHandler不执行的问题：操作报错

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"));     }

}