Spring MVC doesn't display data in view [duplicate]

Question

Possible Duplicate:
JSP: EL expression is not evaluated

I have the following code in my controller.

@RequestMapping(value = "/sum", method = RequestMethod.GET)
public String sum(@RequestParam("input1") String value1,
        @RequestParam("input2") String value2, ModelMap model) {
    model.addAttribute(
            "msg",
            Integer.toString(Integer.parseInt(value1)
                    + Integer.parseInt(value2)));
    return "index";
}

Following is my view:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<html>
<body>
<h2>Hello World!</h2>
<h2>Movie Name : <c:out value="${msg}"></c:out></h2>    
</body>
</html>

But my output is

Hello World!
Movie Name : ${msg}

Where am i wrong?

I've seen several questions like this before, you might search those out. Here is one, here is another, and here is another. — Beau Grantham
– Beau Grantham, Commented Dec 22, 2011 at 21:05
Are you aware that Spring can do type conversion for you and that you can make the method parameters Integer, avoiding the manual type conversion? — Dave Newton
– Dave Newton, Commented Dec 22, 2011 at 21:30
This answer: stackoverflow.com/questions/1529184/… may be helpful. — Bill
– Bill, Commented Dec 22, 2011 at 21:55

Mobiz Tech Team · Accepted Answer · 2011-12-23 07:46:44Z

2

This is because jstl library is not available. Either copy it to WEB-INF/lib or copy that directly to Tomcat/lib directory and restart Tomcat.

answered Dec 23, 2011 at 7:46

Mobiz Tech Team

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Comments

Carlos Quijano · Accepted Answer · 2011-12-22 21:39:30Z

0

You're returning a View String "index" but your model is not being sended/attached to the response view, so $msg is not found/bound in your JSP

Try this

 @RequestMapping(value = "/sum", method = RequestMethod.GET)
 public ModelAndView sum(@RequestParam("input1") String value1, @RequestParam("input2") String value2, ModelMap model) {
        model.addAttribute( "msg", Integer.toString(Integer.parseInt(value1) + Integer.parseInt(value2)));
        return new ModelAndView("index", model);
 }

answered Dec 22, 2011 at 21:39

Carlos Quijano

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2 Comments

Dave Newton Over a year ago

I don't believe this is correct--you can return a string to indicate the view to be rendered, objects in the model are still exposed.

Beau Grantham Over a year ago

The view would simply not print anything if this were the case. Spring carries model forward when returning a String, so changing the method to return a ModelAndView is not necessary in this case.

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