Unable to read facebook comments using facebook4j

Question

I am trying to read facebook comments from a post using facebook4j library.And it returns only post but not comments for that post. It is always return empty even there are more comments in any post. Could anyone guide me the correct way to get all comments from a particular post?

import facebook4j.Comment;
import facebook4j.Facebook;
import facebook4j.FacebookException;
import facebook4j.FacebookFactory;
import facebook4j.PagableList;
import facebook4j.Post;
import facebook4j.Reading;
import facebook4j.ResponseList;
import facebook4j.auth.AccessToken;

public class PostsFromPageExtractor {

    /**
    * A simple Facebook4J client which
    * illustrates how to access group feeds / posts / comments.
    *
    * @param args
    * @throws FacebookException
    */
    public static void main(String[] args) throws FacebookException {

        // Generate facebook instance.
        Facebook facebook = new FacebookFactory().getInstance();
        // Use default values for oauth app id.
        facebook.setOAuthAppId("", "");
        // Get an access token from:
        // https://developers.facebook.com/tools/explorer
        // Copy and paste it below.
        String accessTokenString = "PASTE_YOUR_ACCESS_TOKEN_HERE";
        AccessToken at = new AccessToken(accessTokenString);
        // Set access token.
        facebook.setOAuthAccessToken(at);

        // We're done.
        // Access group feeds.
        // You can get the group ID from:
        // https://developers.facebook.com/tools/explorer

        // Set limit to 25 feeds.
        ResponseList<Post> feeds = facebook.getFeed("187446750783",new Reading().limit(25));

        // For all 25 feeds...
        for (int i = 0; i < feeds.size(); i++) {
            // Get post.
            Post post = feeds.get(i);
            // Get (string) message.
            String message = post.getMessage();
            // Print out the message.
            System.out.println(message);

            // Get more stuff...
            PagableList<Comment> comments = post.getComments();
            String date = post.getCreatedTime().toString();
            String name = post.getFrom().getName();
            String id = post.getId();
        }
    }
}

String name = "pagename";
ResponseList<Post> feeds = facebook.getFeed(name, new Reading().limit(250));
System.out.println(feeds.size());

I also come across this kind of error ..Are you able to get the data with the object_id obtained? — Paraneetharan Saravanaperumal, Oct 20 '15 at 10:12
yah. I could able to get a post . but that contains no any comments. What will be the reason? — Rajpirathap Sakthithasan, Oct 20 '15 at 16:06
yes, We are in same boat. Some one should give thuduppu kaddai for us. — Rajpirathap Sakthithasan, Oct 21 '15 at 10:32
It seems that you are not getting an error, but rather you are just not getting the data you are looking to get back. This seems to be a bug with the facebook4j library, and you can file a bug report for the team that maintains it. — derabbink, Nov 06 '15 at 12:31

score 3 · Accepted Answer · answered Nov 04 '15 at 05:31

3

I think around version 2.4, Facebook now requires you to specify the fields you are interested in when you issue a get request. If you don't specify these fields, only the post is return. Comments are one of those fields.

To speficy the fields you'd use the Reading object just like you would in specifying the number of items to be returned:

// Specify all fields of interest like description, created_time, from, etc.
final Reading reading = new Reading().limit(25).fields("comments"); 
final ResponseList<Post> feeds = facebook.getFeed("187446750783", reading);

The rest should be the same.

answered Nov 04 '15 at 05:31

kilemensi

58
4

Thanks a lot. It worked well with your suggested idea. Maxxx. (y) – Rajpirathap Sakthithasan Nov 07 '15 at 15:41
How can I retrieve all total number of counts for comments and likes for a specific post using facebook4j in Android. I know, using Graph API, you can use `likes.summary(true)` and `comments.summary(true)`. But how can I retrieve these using `Reading` object and `fields` with `Reading`? Any help would be highly appreciable. Thanks – YuDroid Apr 06 '16 at 12:42

Unable to read facebook comments using facebook4j

1 Answers1