Spring Framework 3 and session attributes

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It throws Exception if controller called first time even though added @SessionAttributes({“form”}) to class. So add following populateForm method will fix this.

@SessionAttributes({"form"})
@Controller
public class MyController {

   @ModelAttribute("form")
   public Form populateForm() {
       return new Form(); // populates form for the first time if its null
   }

   @RequestMapping(value="form", method=RequestMethod.GET)
   public ModelAndView viewForm(@ModelAttribute("form") Form form) {
       ModelAndView mav = new ModelAndView("form");      
       if(form == null) form = new Form();
       mav.addObject("form", form);
       return mav;
   }

   @RequestMapping(value="form", method=RequestMethod.POST)
   @Transactional(readOnly = true)
   public ModelAndView saveForm(@ModelAttribute("form") Form form) {
      // ..etc etc
   }
}

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