 and the callback interfaces registered for each class.
         If a callback class does not implement any recognized callback interfaces, the
         associated collection of registered interfaces for the class will be empty.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - in case any of the callback instances is