SpringMVC - Unable to pass model objects between controllers

[Shihu Salam]

Hi,
I am new to SpringMVC using annotations. Learning the flow, but stuck with a situation where I need to pass mode objects between two controllers. For eg, I have a Login Controller and Customer Controller, If login is success it will redirect to the Customer Controller where the customer details are displayed. When logged in, I need to get the login model objects (which contain login username & password) inorder to get the Customer objects. I tried using @ModelAttribute("login"), but not working.
Posted code snippets below:

LoginController

	@RequestMapping(method = RequestMethod.POST)
	public String onSubmit(@ModelAttribute("login") Login login) {
		if (loginService.authenticate(login)) {
			return "redirect:customerDetails";
		} else {
			login.setLoginMessage("Invalid login");
			return "login";
		}
	}

CustomerDetailsController

	@RequestMapping(method = RequestMethod.GET)
	public String initForm(@ModelAttribute("login") Login login, ModelMap model) {
		Customer customer = new Customer();
		customer = customerService.select(login.getId(), login.getPassword());
		model.addAttribute("customerDetails", customer);
		return "customerDetails";
	}

But here the login attribute is empty so that I cannot query the Customer object using the id and password
Please Help..! Thanks in Advance..

[Kathleen Angeles]

Try using @SessionAttributes.

- k


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[SpringSource Certified Spring Professional (Spring Certification) – Practice Tests]

[Shihu Salam]

I got the solution..!!! Spring 3.1 introduces a new feature called 'RedirectAttributes' where we can set our object in one controller (POST) and retrieved in the other controller (GET), which will solve the issue.
Thanks for the reply..

LoginController

 	@RequestMapping(method = RequestMethod.POST)
	public String onSubmit(@ModelAttribute("login") Login login,
			[b]final RedirectAttributes redirectAttrs[/b]) {
		if (loginService.authenticate(login)) {
			[b]redirectAttrs.addFlashAttribute("loginFlashAttribute", login);[/b]
			return "redirect:customerDetails";
		} else {
			login.setLoginMessage("Invalid login");
			return "login";
		}
	}

CustomerDetailsController

	@RequestMapping(method = RequestMethod.GET)
	public String initForm(
			[b]@ModelAttribute("loginFlashAttribute") final Login login[/b],
			ModelMap model) {
		Customer customer = new Customer();
		customer = customerService.select(login.getId(), login.getPassword());
		if (customer != null)
			customer.setViewMode(true);
		model.addAttribute("customerDetails", customer);
		return "customerDetails";
	}