java code for Simple error testing

//File: index.jsp
<%@ page errorPage="errPage.jsp" %>



<%!
String nullString = null;
%>
<%-- Intentionally invoking a NullPointerException --%>
The length of the nullString is <%= nullString.length() %>



/////////////////////////////////////////////////////
//File: errPage.jsp
<%@ page isErrorPage="true" %>

Uncaught exception <%= exception %> has been encountered!