JSONArray position = new JSONArray();
position.put(32L);

System.out.println("before pub: " + position);
pubnub.publish()
    .message(position.toList())
    .channel("my_channel")
    .async(new PNCallback<PNPublishResult>() {
        @Override
        public void onResponse(PNPublishResult result, PNStatus status) {
            //  handle publish result, status always present, result if successful
            //  status.isError to see if error happened
            if(!status.isError()) {
                System.out.println("pub timetoken: " + result.getTimetoken());
            }
            System.out.println("pub status code: " + status.getStatusCode());
        }
    });