index.xml
<%@ page errorPage="processError.jsp" %>
<%-- Declare the page to send errors to --%>
<%-- This scriptlet checks a hidden field to see whether or not to throw an exception --%>
<%
String hiddenField = request.getParameter("hiddenValue");
if ( hiddenField !=null && !hiddenField.equals(""))
throw new java.lang.NullPointerException();
%>
Generate Error
This page generates an error when you click the button.
processError.jsp
<%@ page isErrorPage="true" %>
Process Error
<% 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");
}
%>