code: public Reply getReplyInfo(String topicId, String replyId) throws FlickrException {
          Map<String, Object> parameters = new HashMap<String, Object>();
          parameters.put("method", METHOD_REPLIES_GET_INFO);
          parameters.put("topic_id", topicId);
          parameters.put("reply_id", replyId);
  
          Response response = transportAPI.get(transportAPI.getPath(), parameters, apiKey, sharedSecret);
          if (response.isError()) {
              throw new FlickrException(response.getErrorCode(), response.getErrorMessage());
          }
  
          Element replyElement = response.getPayload();
  
          return parseReply(replyElement);
      }
docs: Get info for a given topic reply
  
  @param topicId
  Unique identifier of a topic for a given group {@link Topic}.
  @param replyId
  Unique identifier of a reply for a given topic {@link Reply}.
  @return A group topic
  @throws FlickrException
  @see <a href="http://www.flickr.com/services/api/flickr.groups.discuss.replies.getInfo.html">API Documentation</a>