div class="block"><p>
 Register unmarshal event callback <a href="Unmarshaller.Listener.html" title="class in jakarta.xml.bind"><code>Unmarshaller.Listener</code></a> with this <a href="Unmarshaller.html" title="interface in jakarta.xml.bind"><code>Unmarshaller</code></a>.
 
 <p>
 There is only one Listener per Unmarshaller. Setting a Listener replaces the previous set Listener.
 One can unregister current Listener by setting listener to <code>null</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters: