//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://localhost:8080/home") + "\">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();
