ncEvent.getThrowable()</code></a>.</li>
 <li>If none of the listeners called <a href="../../javax/servlet/AsyncContext.html#complete--"><code>complete()</code></a> or any of the <a href="../../javax/servlet/AsyncContext.html#dispatch--"><code>dispatch()</code></a> methods, perform an error
 dispatch with a status code equal to <tt>HttpServletResponse.SC_INTERNAL_SERVER_ERROR</tt>, and make the above
 <tt>Throwable</tt> available as the value of the <tt>RequestDispatcher.ERROR_EXCEPTION</tt> request
 attribu