by calling <a href="../../../../../../../javax/faces/component/behavior/ClientBehaviorHolder.html#getDefaultEventName--"><code>ClientBehaviorHolder.getDefaultEventName()</code></a>.
 If that returns <code>null</code> throw an <code>exception</code>.</li>
 <li>If the <code>events</code> attribute value is specified, ensure it
 that it exists in the <code>Collection</code> returned from a call to
 <a href="../../../../../../../javax/faces/component/behavior/ClientBehaviorHolder.html#getEventNames--"><code>Cli