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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.java2java.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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