/javase/8/docs/api/java/util/OptionalInt.html?is-external=true" title="class or interface in java.util"><code>OptionalInt</code></a>.
 <p>
 May not be used when <code>ExtractedValue</code> is defined on the type parameter of
 a generic container type. A <code>ValueExtractorDefinitionException</code> will be thrown
 in this case.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the type of the value extracted by the value extractor</dd>
</dl>
<dl>
<dt>Default:</dt>
<dd>void.class</dd>
</dl>
