ErrorGen.java Source code

Introduction

Here is the source code for ErrorGen.java
Source

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ErrorGen extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, java.io.IOException {

        //check the servlet exception
        Throwable throwable = (Throwable) request.getAttribute("javax.servlet.error.exception");
        String servletName = (String) request.getAttribute("javax.servlet.error.servlet_name");
        if (servletName == null)
            servletName = "Unknown";

        String requestUri = (String) request.getAttribute("javax.servlet.error.request_uri");
        if (requestUri == null)
            requestUri = "Unknown";

        response.setContentType("text/html");
        java.io.PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Error page</title>");
        out.println("</head>");
        out.println("<body>");
        if (throwable == null) {
            out.println("<h2>The error information is not available</h2>");
            out.println("Please return to the <a href=\"" + response.encodeURL("http://www.java2s.com")
                    + "\">home page</a>");
        } else {
            out.println("<h2>Here is the error information</h2>");

            out.println("The servlet name associated with throwing the exception: " + servletName + "<br><br>");
            out.println("The type of exception: " + throwable.getClass().getName() + "<br><br>");
            out.println("The request URI: " + requestUri + "<br><br>");
            out.println("The exception message: " + throwable.getMessage());
        }
        out.println("</body>");
        out.println("</html>");
        out.close();
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, java.io.IOException {

        doPost(request, response);
    }
}