keyMap.addKeyChangeListener(this);
KeyMapper.addKeyChangeListener(this);
   public KeyboardHandler(Session session) {      this.session = session;      this.screen = session.getScreen();      String os = System.getProperty("os.name");      if (os.toLowerCase().indexOf("linux") != -1) {         System.out.println("using os " + os);         isLinux = true;      }      keyMap = new KeyMapper();      keyMap.init();      keyMap.addKeyChangeListener(this);      // initialize the keybingings of the components InputMap      initKeyBindings();   }