jsp page is not displaying the value of variable inside curly brackets just display the variable name

I am learning spring mvc and using jsp as my view layer but I have a problem with jsp page when I put a an attribute in model like that

 @RequestMapping
    public String sayHello(ModelMap model)
    {
        model.addAttribute("message","welcome to 3-IDIOTS web store");

        return "hello";
    }

then inside the jsp page hello.jsp I try to use it like that

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


<html>
<head>
    <title>Title</title>
</head>
<h2>${message}</h2>
<body>

</body>
</html>

then start to run tomcat and run the application I get this this is what happens when I run tomcat

note: I know that I can solve it using the following code

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String message =(String) request.getAttribute("message");

%>

<html>
<head>
    <title>Title</title>
</head>
<h2><%=message%></h2>
<body>

</body>
</html>

but I want to know why the code using ${meassage} is not working.