public class LinkDecorator implements DecoratorProcessor<Marshaller, AddLinks> {

   public Marshaller decorate(Marshaller target, final AddLinks annotation,
         Class type, Annotation[] annotations, MediaType mediaType) {
      target.setListener(new Listener() {
         @Override
         public void beforeMarshal(Object entity) {
            UriInfo uriInfo = ResteasyContext.getContextData(UriInfo.class);
            ResourceMethodRegistry registry = (ResourceMethodRegistry) ResteasyContext.getContextData(Registry.class);

            // find all rest service classes and scan them
            RESTUtils.addDiscovery(entity, uriInfo, registry);
         }
      });
      return target;
   }
}

package org.jboss.resteasy.links;

import org.jboss.resteasy.annotations.Decorator;
import org.jboss.resteasy.links.impl.LinkDecorator;

import javax.xml.bind.Marshaller;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Use on any JAX-RS method if you want RESTEasy to inject the RESTServiceDiscovery
 * to every entity in the response. This will only inject RESTServiceDiscovery instances
 * on entities that have a field of this type, but it will be done recursively on the response's
 * entity.
 * @author <a href="mailto:stef@epardaud.fr">Stéphane Épardaud</a>
 */
@Target( { ElementType.TYPE, ElementType.METHOD, ElementType.PARAMETER,
      ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Decorator(processor = LinkDecorator.class, target = Marshaller.class)
@Documented
public @interface AddLinks {
}