javax.ws.rs.core.Application

javax.ws.rs.core.Application is a standard JAX-RS class that you may implement to provide information on your deployment.  It is simply a class the lists all JAX-RS root resources and providers.

/**
 * Defines the components of a JAX-RS application and supplies additional
 * metadata. A JAX-RS application or implementation supplies a concrete
 * subclass of this abstract class.
 */
public abstract class Application
{
   private static final Set<Object> emptySet = Collections.emptySet();

   /**
    * Get a set of root resource and provider classes. The default lifecycle
    * for resource class instances is per-request. The default lifecycle for
    * providers is singleton.
    * <p></p>
    * <p>Implementations should warn about and ignore classes that do not
    * conform to the requirements of root resource or provider classes.
    * Implementations should warn about and ignore classes for which
    * {@link #getSingletons()} returns an instance. Implementations MUST
    * NOT modify the returned set.</p>
    *
    * @return a set of root resource and provider classes. Returning null
    *         is equivalent to returning an empty set.
    */
   public abstract Set<Class<?>> getClasses();

   /**
    * Get a set of root resource and provider instances. Fields and properties
    * of returned instances are injected with their declared dependencies
    * (see {@link Context}) by the runtime prior to use.
    * <p></p>
    * <p>Implementations should warn about and ignore classes that do not
    * conform to the requirements of root resource or provider classes.
    * Implementations should flag an error if the returned set includes
    * more than one instance of the same class. Implementations MUST
    * NOT modify the returned set.</p>
    * <p></p>
    * <p>The default implementation returns an empty set.</p>
    *
    * @return a set of root resource and provider instances. Returning null
    *         is equivalent to returning an empty set.
    */
   public Set<Object> getSingletons()
   {
      return emptySet;
   }

}

Using Application

To use Application you must set a servlet context-param, javax.ws.rs.core.Application with a fully qualified class that implements Application.  For example:

   <context-param>
      <param-name>javax.ws.rs.core.Application</param-name>
      <param-value>com.mycom.MyApplicationConfig</param-value>
   </context-param>

If you have this set, you should probably turn off automatic scanning as this will probably result in duplicate classes being registered.