ockList">
<h4>NULL_VALUE</h4>
<pre>public static final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> NULL_VALUE</pre>
<div class="block"><p class="changed_added_2_2">Because <code>null</code>
 values are not allowed as the source for subclasses of <code>EventObject</code>,
 such as <a href="../../../javax/faces/event/PostKeepFlashValueEvent.html" title="class in javax.faces.event"><code>PostKeepFlashValueEve