code: public static List<CustomResourceHandler> getCustomResourceHandlers() {
  		ServiceLoader<CustomResourceHandler> loader = ServiceLoader.
  				load(CustomResourceHandler.class, Para.getParaClassLoader());
  		List<CustomResourceHandler> externalResources = new ArrayList<>();
  		for (CustomResourceHandler handler : loader) {
  			if (handler != null) {
  				externalResources.add(handler);
  			}
  		}
  		return externalResources;
  	}
docs: Try loading external {@link com.erudika.para.rest.CustomResourceHandler} classes.
  These will handle custom API requests.
  via {@link java.util.ServiceLoader#load(java.lang.Class)}.
  @return a loaded list of  ServletContextListener class.