ForwardException - show forwarding an exception to an error page : Exception « Servlets « Java






  1. Java
  2. Servlets
  3. Exception

ForwardException - show forwarding an exception to an error page

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);
    }
  }
}








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