Java SE (Java Platform, Standard Edition)

dear forum users.
Im having a bit of a problem with a keylistener.
To get it to work, i have to take focus away from the window (JFrame), and then back again..

My KeyListener:

public class KeyBinder implements KeyListener {
    private Map<Integer,CustomKeyEvent> keys = new HashMap<Integer,CustomKeyEvent>();
    

    public void keyReleased(KeyEvent e) {
        if (keys.containsKey(e.getKeyCode())) {
            keys.get(e.getKeyCode()).keyReleased(this);
        }
    }
    public void keyTyped(KeyEvent e) {
        if (keys.containsKey(e.getKeyCode())) {
            keys.get(e.getKeyCode()).keyTyped(this);
        }
    }
    public void keyPressed(KeyEvent e) {
        if (keys.containsKey(e.getKeyCode())) {
            keys.get(e.getKeyCode()).keyPressed(this);
        }
    }

I have also tried to just add a System.out.println in the beginning of keyPressed.. And no event is fired.

My JFrame:

    public JFrame_Main(String title, Dimension size) {
        super(title);
        setSize(size);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setFocusable(false);
    }

My Panel that should get focus:

public class JPanel_GameStarted_PlayingField extends JPanel implements TimerInterface {
    private Timer timer;
    public JPanel_GameStarted_PlayingField() {
        addKeyListener(Information.getKeyBinder());
        setVisible(false);
        setSize(Information.getMainFrame().getSize().width - 8, Information.getMainFrame().getSize().height - 50);
        setLocation(0,0);
        setBorder(BorderFactory.createLineBorder(Color.BLACK));
        addMouseListener(new CustomMouseListener(Information.getGameController().getSelf()));
        
        timer = new Timer();

        timer.scheduleAtFixedRate(new ExtendedTimerTask(this), 0, 20);
        setFocusable(true);
        setVisible(true);
        requestFocus();
    }

The strange thing is, the mouselistener works fine..
Anyone know what might be wrong?