今天踩了个大坑，springmvc的Circular view path

搭建了个基本的springmvc的，写了一个controller,

@RequestMapping(value="/login" ,produces =
"text/html;charset=UTF-8")
public ModelAndView login(HttpSession
session,String account,String
password) throws UnsupportedEncodingException{
ModelAndView
mav = new ModelAndView();
mav.setViewName("main.jsp");
return
mav;
}
跑起来之后访问这个接口，报错：

javax.servlet.ServletException: Circular view path [login]: would dispatch back to the current handler URL [/sale/login] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)

查了好几遍代码和配置文件都没找到问题，最后发现是ModelAndView这个类的包导入错了，导入成了：
import org.springframework.web.portlet.ModelAndView;
而正确的应该是用：

import org.springframework.web.servlet.ModelAndView;
觉得自己好蠢，总被这种小问题困住好久，好蠢啊