Question

LoginFormController–>Post is invoked after the form is submitted/posted. At the end, it invokes another Controller called LandingFormController–>loadForm.

Well, in the loadForm the values in the Model seems to be empty. Is there a way I can persist a Bean in session or request and get it in the loadForm method? Bonus points: if you could point to some documents to refer 🙂

Thanks

@Controller
@RequestMapping(value="/login")
public class LoginFormController {  

@RequestMapping(method=RequestMethod.POST)
public ModelAndView post(@ModelAttribute User user, BindingResult result, SessionStatus status) {
    logger.info("post");
    new ReceiptUserValidator().validate(user, result);
    if (result.hasErrors()) {
        return new ModelAndView("login");
    }
    else {
        logger.info("Email Id: " + user.getEmailId());
        //status.setComplete();         

        Map<String, Object> model = new HashMap<String, Object>();
        model.put("userId", user.getEmailId());
        model.put("now", new Date().toString());

        return new ModelAndView("redirect:/landing.htm", "model", model);
    }
}

Controller B below that gets called

@Controller
@RequestMapping(value="/landing")
public class LandingFormController {    
    protected final Log logger = LogFactory.getLog(getClass());

    @RequestMapping(method=RequestMethod.GET)
    public String loadForm(Model model) {
        logger.info("LandingFormController loadForm: " + model.asMap().keySet());       
        return "landing";
    }

}

Answer 1

The code is performing a redirect which causes the properties placed in the model to be lost. Use flash attributes to pass the attributes to the next controller.

Flash attributes provide a way for one request to store attributes
intended for use in another. This is most commonly needed when
redirecting — for example, the Post/Redirect/Get pattern. Flash
attributes are saved temporarily before the redirect (typically in the
session) to be made available to the request after the redirect and
removed immediately.

LoginFormController

@Controller
@RequestMapping(value="/login")
public class LoginFormController {  

@RequestMapping(method=RequestMethod.POST)
public ModelAndView post(@ModelAttribute User user, BindingResult result,
      SessionStatus status, final RedirectAttributes redirectAttrs) {

    logger.info("post");
    new ReceiptUserValidator().validate(user, result);
    if (result.hasErrors()) {
        return new ModelAndView("login");
    }
    else {
        logger.info("Email Id: " + user.getEmailId());
        //status.setComplete();         

        redirectAttrs.addFlashAttribute("userId", user.getEmailId());
        redirectAttrs.addFlashAttribute("now", new Date().toString());

        return new ModelAndView("redirect:/landing.htm", "model", model);
    }
}

Documentation

As an alternative solution you could simply not perform a redirect from the controller.

Appending retrieving solution.

Modify the loadForm

 public String loadForm(@ModelAttribute("user") User user) {
        logger.info("LandingFormController loadForm: " + user.getEmailId());        
        return "landing";
    }