ovider or
 <a href="../../../../javax/ws/rs/core/Feature.html" title="interface in javax.ws.rs.core"><code>feature</code></a>) classes to be instantiated, injected and utilized in the scope
 of the configurable instance.
 <p>
 For each component type, there can be only a single class-based or instance-based registration
 present in the configuration context at any given time.
 </p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the immutable set of registered component classes. The return