e/Feature.html" title="interface in javax.ws.rs.core">Feature</a>&nbsp;feature)</pre>
<div class="block">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.
 <p>
 Method returns <code>true</code> only in case an instance equal to the <code>feature</code>
 instance is already present among the features previously successfully enabled in
 the configur