Servlets can't get attribute at jsp-CodePudding

I am making simple hello world jsp application and I can't get request attribute either by jsp or scriptlets in jsp Here is servlet class


@WebServlet(name = "helloServlet", value = "/hello-servlet")
public class HelloServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
        request.setAttribute("test", 123);
        request.getRequestDispatcher("/index.jsp").forward(request, response);
    }
}

Here is index.jsp:

<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>JSP - Hello World</title>
</head>
<body>
<h1>Hello world</h1>
<h2>attribute is: ${test}</h2>
<br/>
</body>
</html>

I am getting just attribute is: . It is empty. I tried also doing ${param.test} and other but nothing worked

CodePudding user response：

So far you do not access the request attribute.

Try request.getAttribute("test")

Here is an example that sets the attribute in one JSP and uses it in another: https://developpaper.com/jsp-request-setattribute-in-detail-and-an-example/