Spring MVC Controller working but not creating the specified response URL ,It is creating the url from request mapping string

Question

I am studying spring MVC based webapps. So I created a project in spring mvc and I have chosen eclipse IDE.Apache tomcat 8 server and jre1.8 the version of spring package is 4.2

Answer 1

I changed the return type of method submitBranchInsert as String as follows

 @RequestMapping(value="/branchsubmitinsert.travel", method=RequestMethod.POST)
public String submitBranchInsert(ModelMap model,@ModelAttribute BranchModel branchModel){

    //ModelAndView modelAndView = new ModelAndView("/branch/branchinsert");
    //modelAndView.addObject("branch",branchModel);
    //return modelAndView;
    model.addAttribute("branch", branchModel);
    return "/branch/branchinsert";

}

now its ok but why i can't use ModelAndView here instead of Model in String , may be my sound dumb to the experts in Spring MVC. I just want to know when should use ModelAndView instead of Model in String? I don't want to ask this question as separately that is why I am asking this with my answer itself. anybody can help me?