kProvider</code></a> implementation or
 <code>null</code> if none is specified.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>clock provider class name or <code>null</code></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
</li>
</ul>
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<h4>getValueExtractorClassNames</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true