Spring MVC model

I am trying to display the exception occurred in the controller on the view layer. For this I have setup a try catch block like:

public String persistUserData( )
{
  try
    {
        //Make DB Call
        // Update DB and get new Data

        model.addAttribute( "updatedData", data );

        throw new Exception("Creating an Exception");

    }
    catch(Exception e)
    {
        model.addAttribute开发者_运维问答("myException", ex.getClass());

    }

    return "myPage.jsp";
}

In my view I am trying to print it with ${myException}, but its not printing anything. What is going wrong here?

I am so sorry to tell this, but it works for me...

@Controller
@RequestMapping("/")
public class MyController {

    @RequestMapping
    public String omg(@RequestParam("name") String name, Model model) {
        try {
            model.addAttribute("name", name);
            throw new Exception("OMG!");
        } catch (Exception e) {
            model.addAttribute("myException", e);
        }
        return "/WEB-INF/foo.jsp";
    }

}

And foo.jsp:

Name: ${name}<br/>
Error was: ${myException}

This renders (with default Spring MVC configuration under http://localhost:8080/app/?name=abc):

Name: abc
Error was: java.lang.Exception: OMG!

I swear!

You can use this pattern :

   @Controller
    @RequestMapping("/")
    public class MyController {
         //catch any exception 
         @ExceptionHandler(Exception.class)
          public ModelAndView handleMyException(Exception  exception) {
             ModelAndView mv = new ModelAndView("errorPage);
             mv.addObject("message",exception.getMessage());
             return mv;
                  } 

          @RequestMapping(value="/doSomething", method=RequestMethod.GET)
          public ModelAndView doSomething() {
           /doSomething
         throw new Exception("OMG!");
            return mv;
                  } 

    }

Hope it helps.

You should return the model from the function, which would look like

return model;

And model should be from type ModelAndView.