@RequestMapping(value = "/login", method = RequestMethod.GET)
	public String login(Model model,
						@RequestParam(value = "error", required = false) String error,
						@RequestParam(value = "logout", required = false) String logout) {
		//database  get Person(id)
		
		 auth = SecurityContextHolder.getContext().getAuthentication();

		if (!(auth instanceof AnonymousAuthenticationToken)) {

		    /* The user is logged in :) */			
		    return adminPage(model);
		}
		
		if (error != null) {
			model.addAttribute("error", "Invalid username and password!");
		}
 
		if (logout != null) {
			model.addAttribute("msg", "You've been logged out successfully.");
		}
		
		return "login";
	}