In Spring MVC, @ResponseBody return null when add self defined Annotation

For example,

@Authority
@RequestMapping(value="/list",method = RequestMethod.POST)
public @ResponseBody String listNewEnterprises(HttpServletRequest request) {    
    JSONObject json = new JSONObject();
    //do something
    Object o;
    try {
        json.put("result", "success");
        json.put("value", o);
    } catch (JSONException e) {
        e.printStackTrace();
    }
    System.out.println(json);// can print the json value
    return json.toString();
}

All work well before adding @Authority, but once added @Authority, the ajax get Null.

My @Authority is used to authorize user's right to access the method, which is intercepted by extending HandlerInterceptorAdapter.

The spring-mvc.xml is configured as:

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<mvc:annotation-driven />
<mvc:interceptors>      
     <bean class="com.sjd.annotation.AuthorityAnnotationInterceptor"></bean>
</mvc:interceptors>