Error without handler : Errors « JSP « Java

Error without handler

//File Name: generateErrorNoHandler.jsp

<%-- 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="generateErrorNoHandler.jsp">
      <INPUT TYPE="HIDDEN" NAME="hiddenValue" VALUE="error">
      <INPUT TYPE="SUBMIT" VALUE="Generate exception!">


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