/**
  * Get the message rate for the given jolokia request URL.
  *
  * @param requestURL the request URL for message rate
  * @return the message rate
  * @throws JSONException
  */
 private Double getMessageRate(String requestURL) throws JSONException {
   String response = restTemplate.getForObject(requestURL, String.class).toString();
   JSONObject jObject = new JSONObject(response);
   JSONObject value = jObject.getJSONObject("value");
   return (Double) value.getJSONObject((String) value.names().get(0)).get("MeanSendRate");
 }