Debug.println(Debug.MEDIUM, this + ": stopping");
Debug.println(Debug.MEDIUM, "ClientServant: stopping");
  public final void stopClientServant() {    Uplink old = this.uplink;    // verhindert, da stopClientServant mehrmals luft    this.uplink = null;    // Versuch, ein StopClientCommand() zu senden    if (old != null) {      Debug.println(Debug.MEDIUM, this + ": stopping");      try {        old.sendMsg(new StopClientCommand());      } catch (java.io.IOException e) {        Debug.println(Debug.HIGH, this + " error sending stopClient:" + e);      }      old.stopUplink();    }    // assocs lsen    this.setDownlink(null);    this.setServer(null);    this.setUser(null);  }