try is used as the name of the implementation
 class.</li>
 <li>If a system property with the name <code>jakarta.ws.rs.ext.RuntimeDelegate</code> is defined, then its value is used as
 the name of the implementation class.</li>
 <li>Finally, a default implementation class name is used.</li>
 </ul></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an instance of <code>RuntimeDelegate</code>.</dd>
</dl>
</li>
</ul>
<a name="setInstance-jakarta.ws.rs.ext.RuntimeDelegate-">
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</a>
<ul c