ForwardException.java Source code

Introduction

Here is the source code for ForwardException.java
Source

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/*
 * ForwardException - show forwarding an exception to an error page.
 * 
 * @author  Ian Darwin
 * @version $Id: ForwardException.java,v 1.2 2002/03/13 21:50:30 ian Exp $
 */
public class ForwardException extends HttpServlet {
    /** Called in response to a GET request (data encoded in the URL) */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        ServletContext application = getServletContext();

        // BOILERPLATE beginning 
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        try {
            // to do: logic code and main HTML goes here.

            // simulate an error condition happening at run time.
            if (this instanceof Servlet)
                throw new RuntimeException("Test exception");

            out.println("<!DOCTYPE html PUBLIC " + "\"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
                    + "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"\n" + ">");
            out.println("<html>");
            out.println("<head><title>Servlet Output</title></head>");
            out.println("<body>");

            // BOILERPLATE ending
            out.println("</body>");
            out.println("</html>");
            out.close();

        } catch (Exception exc) {

            // dispatch to JSP to display the error.
            RequestDispatcher rd = application.getRequestDispatcher("/oops.jsp");
            request.setAttribute("javax.servlet.jsp.jspException", exc);
            rd.forward(request, response);
        }
    }
}