lock">Check if a particular <a href="../../../../javax/ws/rs/core/Feature.html" title="interface in javax.ws.rs.core"><code>feature</code></a> instance has been previously
 enabled in the runtime configuration context.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../javax/ws/rs/core/Configuration.html#isRegistered-java.lang.Class-">isRegistered</a></span>&#8203;(<a href="h