RestFB how to subscribe to webook

Question

I'm trying to replicate the following request (which I elaborated with the Facebook graph explorer)

POST /{page_id}/subscribed_apps?subscribed_fields=feed,mention

with it's accompanying page access token. The response I get from that request is

{
  "success": true
}

How do I make that same request using RestFB? So far I've managed to come up with:

FacebookClient client = new DefaultFacebookClient(pageAccessToken, Version.VERSION_8_0);
JsonObject result = client.publish(
    String.format("/%s/%s", pageId, "subscribed_apps"),
    JsonObject.class,
    Parameter.with("subscribed_fields", "feed,mention"));

But all I get is:

com.restfb.exception.FacebookOAuthException: Received Facebook error response of type OAuthException: (#100) Parameters do not match any fields that can be updated (code 100, subcode null) 'null - null'

Answer 1

To make this more easy and readable, I suggest you try this code:

FacebookClient client = ne DefaultFacebookClient(pageAccessToken, Version.LATEST);
GraphResponse result = client.publish("me/subscribed_apps",
     GraphResponse.class, 
     Parameter.with("subscribed_fields","feed,mention"));
if (result.isSuccess()) {
  // do some stuff
}

That way, you don't need the page id and no String.format. The page id is already connected to the page access token and sometimes this leads to better working results.

RestFB provides a special object for this kind of requests called GraphResponse. It's a simple object that provides some convenience methods. As long as you don't get a complete object back, like a user or post, this is a better way ;)