Can't use BroadcastOperations to transfer binary data to All clients?

[whg333]

first of all, I am not good at English, please let me konw if you don't know what i say.

I modifed the example of BinaryEventLauncher as below, just to Let All connected client can see the picture if some one upload picture:

    server.addEventListener("msg", byte[].class, new DataListener<byte[]>() {
        @Override
        public void onData(SocketIOClient client, byte[] data, AckRequest ackRequest) {
            server.getBroadcastOperations().sendEvent("msg", data);
            //client.sendEvent("msg", data);
        }
    });

but It doesn't work, not all connected client can see the upload picture, maybe something wrong?

I have to use the for loop to make sure it work as i want:

    server.addEventListener("msg", byte[].class, new DataListener<byte[]>() {
        @Override
        public void onData(SocketIOClient client, byte[] data, AckRequest ackRequest) {
            for(SocketIOClient socketIOClient:server.getAllClients()){
                socketIOClient.sendEvent("msg", data);
            }
            //server.getBroadcastOperations().sendEvent("msg", data);
            //client.sendEvent("msg", data);
        }
    });

please tell me why? do i have to use the for loop instead of BroadcastOperations?