System.out.println("ack from client: " + client.getSessionId() + " data: " + result);
}
}, ackChatObjectData);
ChatObject ackChatObjectData1 = new ChatObject(data.getUserName(), "message with void ack");
client.sendEvent("ackevent3", new VoidAckCallback() {
protected void onSuccess() {
System.out.println("void ack from: " + client.getSessionId());
}