Source Code : Generate errors

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Generate errors


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);
  }
}

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