ng.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> NULL_VALUE</pre>
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 Because <code>null</code> values are not allowed as the source for subclasses of <code>EventObject</code>, such as
 <a href="../event/PostKeepFlashValueEvent.html" title="class in jakarta.faces.event"><code>PostKeepFlashValueEvent</code></a> and <a href="../event/PostPutFlashValueEvent.html" title="class in jakarta.faces.event"><code>PostPutFlas