code: @SuppressWarnings("unchecked")
    public Paging<PlaylistTrack> execute() throws
            IOException,
            SpotifyWebApiException {
      return new PlaylistTrack.JsonUtil().createModelObjectPaging(getJson());
    }
docs: Get a playlist's tracks.
  
  @return A playlist's tracks.
  @throws IOException            In case of networking issues.
  @throws SpotifyWebApiException The Web API returned an error further specified in this exception's root cause.