Deal with the errors : Errors « JSP « Java

Deal with the errors

// generateError.jsp
<%@ page errorPage="processError.jsp" %>    
<%-- Declare the page to send errors to --%>
<%-- After clicking the button, it will call itself again the generate error --%>

<%-- This scriptlet checks a hidden field to see whether or not to throw an exception --%>
  String hiddenField = request.getParameter("hiddenValue");
  if ( hiddenField.equals("error"))
    throw new java.lang.NullPointerException();

  <HEAD><TITLE>Generate Error</TITLE></HEAD>
    This page generates an error when you click the button.<P>
    <FORM METHOD="POST" ACTION="generateError.jsp">
      <INPUT TYPE="HIDDEN" NAME="hiddenValue" VALUE="error">
      <INPUT TYPE="SUBMIT" VALUE="Generate exception!">

//Another JSP file: processError.jsp
<%@ page isErrorPage="true" %>

  <HEAD><TITLE> Process Error</TITLE></HEAD>
    <% if ( exception != null ) {
         out.write("\nAn error occurred. This page is to tell you what you did wrong.\n");
       else {
         out.write("\nYou have reached this page, but no error information is available.\n");


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