request mapping after login in spring annotation

Initially my url is

http://localhost:8081/UserLogin/

after login it will be

http://localhost:8081/UserLogin/login

then go to "add user" link and url will be

http://localhost:8081/UserLogin/admin/addUser

here admin is the session variable it can be admin/user/common etc. From add user form page back to home page should be

http://localhost:8081/UserLogin/admin/home

But now this is showing 404 error and in controller

//method to go back to home page
  @RequestMapping(value = "/home")
  public ModelAndView BacktoHome(HttpServletRequest request,
   HttpServletResponse response,HttpSession session) {
      String sessionUserRole = (String)     
        request.getSession().getAttribute("sessionUserRole");         
      return new ModelAndView("result", "role", 
        sessionUserRole);             
   }

and in add user jsp page:

<!--<% String sessionUserRole = (String) request.getSession().getAttribute("sessionUserRole"); %>
                            <c:set var="role" value="<%=sessionUserRole %>" />-->
                            <li class="admin-login active">Add User<h3><a href="home">BACK</a></h3></li>

how to set correct path in controller class request mapping. I found if i set

//method to go back to home page
  @RequestMapping(value = "admin/home")
  public ModelAndView BacktoHome

it is ok. but it will be dynamic like admin/user/common etc.

Please help!!