When subscribing to a message queue you must extend NotificationListenerAdapter. This class gives you simple message acknowledge.
final BrokerClient bk = new BrokerClient();
// ... connecting ...
Future<HostInfo> future = bk.subscribe("/teste/",NetAction.DestinationType.QUEUE,new BrokerListener() {
@Override
public void deliverMessage(NetMessage message, Channel channel) throws Throwable {
bk.acknowledge(message.getAction().getNotificationMessage());
}
});