public void sendMessage(String callbackURI, String messageSenderId, String message) {
ClientRequest request = null;
ClientResponse<?> response = null;
try {
request = new ClientRequest(getPushMessageURL(callbackURI, messageSenderId));
request.body("text/plain", message);
response = request.post();
if (HttpResponseCodes.SC_OK != response.getStatus()) {
throw new RuntimeException("Message can not be delivered to subscribers");
}
} catch (Exception ex)