cessEvent(jakarta.faces.event.SystemEvent)</code></a> or
 <a href="../../../jakarta/faces/event/ComponentSystemEventListener.html#processEvent-jakarta.faces.event.ComponentSystemEvent-"><code>ComponentSystemEventListener.processEvent(jakarta.faces.event.ComponentSystemEvent)</code></a>, the listener implementation may assume that the
 <code>source</code> of this event instance is the <a href="../../../jakarta/faces/component/UIViewRoot.html" title="class in jakarta.faces.component"><code>UIViewRoot</code></