Spring MVC JSP bounds render no value

The code is as follows:

Controller

@Controller
public class Mv01controller {
    Private final Log logger = Logfactory.getlog (Mv01controller.class);

    Handling "/" Requests of the head type
    @RequestMapping (value = {"/"}, Method = Requestmethod.head)
    Public String Head () {
        return "go.jsp";
    }

    Handling "/" and "/index" Requests for get types
    @RequestMapping (value = {"/index", "/"}, Method = Requestmethod.get)
    Public String index (model model) throws Exception {
        Logger.info ("====processed by index");
        Model.addattribute ("msg", "Go Go go!");
        return "go.jsp";
    }
}

JSP uses ${msg} to receive the MSG value in the model, the browser opens the interface to find the direct display "${msg}"

It was later discovered that the reasons are as follows:
An El regular expression is used on the JSP page and the JSP needs to be configured

<% @page iselignored= "false"%>

Spring MVC JSP bounds render no value