d. Note that the throwable instance represents the
 actual unmapped exception thrown during the request processing, before it has been wrapped into an I/O
 container-specific exception that was used to propagate the throwable to the hosting I/O container.
 </p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>throwable</code> - is <code>null</code>, if the request processing has completed with a response that has been sent to the
 client. In case the request processing resulted in a