Servlet RequestDispatcher is not forwarding

java eclipse jsp tomcat servlets

12,197

Try with prefix slash as shown below

RequestDispatcher aDispatcher = request.getRequestDispatcher("/file.jsp");

if jsp file is present directly under webapp folder.

or try

RequestDispatcher aDispatcher = request.getRequestDispatcher("/WEB-INF/file.jsp");

if jsp file is under WEB-INF folder.

project structure:

WebContent
       |
       |__file.jsp
       |
       |__WEB-INF
              |
              |__file.jsp
              |__web.xml

Read What is WEB-INF used for in a Java web application?

If you want not to access this JSP file directly then put is inside the WEB-INF folder that can't accessed publically that is more secure way for restricted resources.

A JSP file placed under WEB-INF can't accessed directly by simply hitting the URL in that case it can be accessed by the application only.

12,197

Author by

Kenny

Hey I'm a student Informatics - Computer and Cyber Crimes and I want to learn as much as possible

Updated on June 12, 2022

Comments

Kenny almost 2 years

I'm learning Java Servlets and JSP.

I have the following code:

HelloServlet.jsp

public class HelloServlet extends HttpServlet {
    private static final long serialVersionUID=1;

    protected void doGet(HttpServletRequest request,
       HttpServletResponse response)
       throws ServletException, IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8);

        RequestDispatcher aDispatcher = request.getRequestDispatcher("file.jsp");
        aDispatcher.forward(request,response);
   }
}

file.jsp

<!DOCTYPE html>
<%@ page language="java" contentType="text/html; charset=UTF-8" 
   pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
    <head>
        <title>First JSP</title>
    </head>
    <body>
        Hello!!
    </body>
</html>

My web.xml looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://w3.org/2001/XMLSchema-instance" 
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   xmlns:schemaLocation="http://java.sun.som/xml/ns/javaee 
      http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   id="WebApp_ID" version="2.5">

    <display-name>Hello</display-name>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <description></description>
        <display-name>Hello Servlet</display-name>
        <servlet-name>hello</servlet-name>
        <servlet-class>be.howest.HelloServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>hello</servlet-name>
        <url-pattern>/urlpattern</url-pattern>
    </servlet-mapping>

</web-app>

When I'm running the file on Tomcat, I get the following error:
HTTP Status 404 - /Projectname/file.jsp

type - Status report
message - Projectname/file.jsp
description - The requested resource is not available.

What did I do wrong? because I can't find the solution by myself

Sotirios Delimanolis almost 10 years

Where is file.jsp located?
Kenny almost 10 years

in the WEB-INF folder (it's the normal location in Eclipse)
Sotirios Delimanolis almost 10 years

Then you'll want to access it through /WEB-INF/file.jsp.
Kenny almost 10 years

I've putted it under the folder WebContent and now it works. Now it's a stupid question :(
Braj almost 10 years

IS it typo <url-pattern>/urlpattern</url-pattern> or the exact url-pattern defined in web.xml. Is it HelloServlet.jsp or HelloServlet.java