JAX-RS Jersey，如何动态地向Application添加资源或提供者

public class ShoppingApplication extends Application {

  private Set<Object> singletons = new HashSet<>();
  private Set<Class<?>> classes = new HashSet<>();

  public ShoppingApplication() {
    classes.add(CustomerResourceService.class);
    classes.add(JAXBMarshaller.class);
    classes.add(JSONMarshaller.class);
    singletons.add(new CustomerResourceService());
  }

  @Override
  public Set<Class<?>> getClasses() {
    return classes;
  }

  @Override
  public Set<Object> getSingletons() {
    return singletons;
  } 
}
public class ShoppingApplication extends Applic