://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - If the subrootObj parameter is null</dd>
</dl>
</li>
</ul>
<a name="validateRoot-java.lang.Object-">
<!--   -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>validateRoot</h4>
<pre>boolean&nbsp;validateRoot(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in jav