 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></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/Flash.html#NULL_VALUE">NULL_VALUE</a></span></code>
<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/PostKeepFlashV