javax.servlet.ServletException: PWC1232: Exceeded maximum depth for nested request dispatches: 20

[Clinton Morrison]

I am receiving the following error javax.servlet.ServletException: PWC1232: Exceeded maximum depth for nested request dispatches: 20, when deploying a war to Glassfish v 3.0.1. When I reach the request dispatcher I seem to be stuck in a infinite loop. The code is as follows

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <servlet>
        <servlet-name>ControllerServlet</servlet-name>
        <servlet-class>com.informit.webtechnologies.ControllerServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ControllerServlet</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

Contoller Servlet

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.informit.webtechnologies;

import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Clinton
 */
public class ControllerServlet extends HttpServlet {

    private static String HELLO_JSP = "hello.jsp";
    private static String GOODBYE_JSP = "goodbye.jsp";
    private static String OTHER_JSP = "index.jsp";

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Controller servlet the handle requests
     * @param req
     * @param res
     * @throws ServletException
     * @throws IOException
     */
    protected void processRequest(HttpServletRequest req, HttpServletResponse res)
            throws ServletException, IOException {
        try {
            // Get the path - this is our key to our Request map
            String pathInfo = req.getPathInfo();

            // Find out what the user is requesting
            String jsp = null;
            if (pathInfo.equalsIgnoreCase("/hello")) {
                String name = req.getParameter("name");
                PersonBean person = new PersonBean(name);
                HttpSession session = req.getSession();
                session.setAttribute("person", person);
                jsp = HELLO_JSP;
            } else if (pathInfo.equalsIgnoreCase("/goodbye")) {
                HttpSession session = req.getSession();
                PersonBean person = (PersonBean) session.getAttribute("person");
                req.setAttribute("person", person);
                session.removeAttribute("person");
                jsp = GOODBYE_JSP;
            } else {
                jsp = OTHER_JSP;
            }

            // Foward the request to the jsp
            RequestDispatcher dispatcher = req.getRequestDispatcher("/" + jsp);
            dispatcher.forward(req, res);
        } catch (IOException ioe) {
            throw new ServletException(ioe);
        }
    }
}

log

WARNING: ApplicationDispatcher[/ControllerApp] PWC1231: Servlet.service() for servlet ControllerServlet threw exception
javax.servlet.ServletException: PWC1232: Exceeded maximum depth for nested request dispatches: 20
        at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:807)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:517)
        at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:488)
        at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:379)
        at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:336)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:314)
        at com.informit.webtechnologies.ControllerServlet.service(ControllerServlet.java:52)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
        at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
        at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:822)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:517)
        at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:488)
        at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:379)
        at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:336)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:314)
        at com.informit.webtechnologies.ControllerServlet.service(ControllerServlet.java:52)

[Bear Bibeault]

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