code: private boolean isResourceResponse(Object response) {
  		boolean singleResource = response.getClass().getAnnotation(JsonApiResource.class) != null;
  		boolean resourceList = ResourceListBase.class.isAssignableFrom(response.getClass());
  		return singleResource || resourceList;
  	}
docs: Determines whether the given response entity is either a Katharsis
  resource or a list of Katharsis resources.
  
  @param response the response entity
  @return <code>true</code>, if <code>response</code> is a (list of)
  Katharsis resource(s),<br />
  <code>false</code>, otherwise