while (isRunning) {
 gamepad.poll();
 for (Component c : gamepad.getComponents()) {
  if (c.getIdentifier() == button0) {
   if (!oldValue == c.getPollData())) {
    if (oldValue == 0) {
     server.motor1Forward();
     oldValue = 1;
    } else {
     server.motor1Stop();
     oldValue = 0;
    }
   }
  }
 }
}