I was playing with the new RedirectAttribute in spring and wanted to be able to do a post redirect get pattern while passing the binding results back to the GET method. If I key my BindingResults in the POST RedirectAttributes as BindingResult.MODEL_KEY_PREFIX + "user", then in the GET method the binding result is cleared because I'm assuming my modelMap entry gets overwritten by a empty BindingResult for the new method.

I've come up with the solution below, which keys my binding results as "errors" in the POST and then in the GET method I pull it out and stick it in the modelMap under BindingResult.MODEL_KEY_PREFIX+"user". Is there a better way to achieve this? Thanks for any help.

Code:
@Controller
@RequestMapping(value = "users")
public class UserController {
	@RequestMapping(method = RequestMethod.GET, value = "post")
	public String postGet(@ModelAttribute("user") User user, ModelMap modelMap) {
		/**
		 * When I try to send the redirectAttribte with
		 * BindingResult.MODEL_KEY_PREFIX+"user" as the key, my binding gets
		 * erased. This is only way I can figure out how to do this, and will
		 * change it if I ever see a better way.
		 */
		modelMap.put(BindingResult.MODEL_KEY_PREFIX + "user",
				modelMap.get("errors"));
		return "users/post";
	}

	@RequestMapping(method = RequestMethod.POST)
	public String testPost(@Valid @ModelAttribute("user") User user,
			BindingResult errors, RedirectAttributes redirectAttributes) {
		if (errors.hasErrors()) {
			redirectAttributes.addFlashAttribute("user", user);
			redirectAttributes.addFlashAttribute("errors", errors);
			return "redirect:users/post";
		}
		userService.put(user);
		redirectAttributes.addAttribute("userId", user.getUserId());
		return "redirect:users/{userId}";
	}
}