What is the use of parameter in @ModelAttribute?

[Arun Singh Raaj]

@ModelAttribute("obj")
public void method(){
	 
}

What does this "obj" do exactly?

[Daniel Demesmaecker]

Its a way to acces data from your jsppage in your controller. Say you have a form and you want to save the values of that form to the database, @ModelAtribute would be the way to go.
For example this a way to register I wrote a while back:

First in the get method you put your form in a map:

 @RequestMapping(method = RequestMethod.GET)
    protected String handle(Map<String, Object> model) {
        User userForm = new User();
        model.put("userForm", userForm);
        return "register";
    }

Then in the post method you can bind the map to a entity and save that entity to the database:

@RequestMapping(method = RequestMethod.POST)
    public ModelAndView processRegister(@ModelAttribute("userForm") User user, Map<String, Object> model) {
        String psw = user.getPassword();
        String check = user.getPasswordCheck();
        String view = null;
        if (psw.equals(check)) {
            service.register(user);
            view = "home";
        } else {
            System.out.println("passwords don't match");
            view = "register";
        }
        String message = "Welcome, " + user.getUserName();
        return new ModelAndView(view,message,greeting");
    }

Hope this clarified it a bit...