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I am using Spring 3.2.0 MVC. In that i have to store one object to session. Currently i am using HttpSession set and get attribute to store and retive the value. It returns only the String not Object. I want to use @SessionAttribute when i tried it sets the object in session but i could not retrieve the session object

 @RequestMapping(value = "/sample-login", method = RequestMethod.POST)
    public String getLoginClient(HttpServletRequest request,ModelMap modelMap) {
        String userName = request.getParameter("userName");
        String password = request.getParameter("password");
        User user = sample.createClient(userName, password);
        modelMap.addAttribute("userObject", user);
        return "user";
    }


     @RequestMapping(value = "/user-byName", method = RequestMethod.GET)
    public
    @ResponseBody
    String getUserByName(HttpServletRequest request,@ModelAttribute User user) {

        String fas= user.toString();
        return fas;
    }

both methods are in same controller. How would i use this to retrieve the object

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You worded the question as if you have code attempting to use @SessionAttribute, but your code snippet doesn't contain it. Therefore, how did you use it? –  sjngm Jul 18 '13 at 11:53
 
I added @SessionAttributes("userObject") i used this in my code –  jackyesind Jul 18 '13 at 11:56
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1 Answer

up vote 3 down vote accepted

@SessionAttributes annotation are used on the class level to :

  1. Mark a model attribute should be persisted to HttpSession after handler methods are executed
  2. Populate your model with previously saved object from HttpSession before handler methods are executed -- if one do exists

So you can use it alongside your @ModelAttribute annotation like in this example:

@Controller
@RequestMapping("/counter")
@SessionAttributes("mycounter")
public class CounterController {

  // Checks if there's a model attribute 'mycounter', if not create a new one.
  // Since 'mycounter' is labelled as session attribute it will be persisted to
  // HttpSession
  @RequestMapping(method = GET)
  public String get(Model model) {
    if(!model.containsAttribute("mycounter")) {
      model.addAttribute("mycounter", new MyCounter(0));
    }
    return "counter";
  }

  // Obtain 'mycounter' object for this user's session and increment it
  @RequestMapping(method = POST)
  public String post(@ModelAttribute("mycounter") MyCounter myCounter) {
    myCounter.increment();
    return "redirect:/counter";
  }
}

Also don't forget common noobie pitfall: make sure you make your session objects Serializable.

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