KeyEventDispatcher KeyEvents always null

Question

I wrote a program to check for keypress, but all KeyEvents returned by the KeyEventDispatcher are null, even when I am pressing a key. I've tried implementing a NullPointerException Try-Catch but since all values are null if I do so nothing happens.

KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(new KeyEventDispatcher() {
            @Override
            public boolean dispatchKeyEvent(KeyEvent ke) {
                synchronized (Processor.class) { //Processor is just the class this is in
                    k = ke;
                    return false;
                }
            }
        });

Just In case it is necessary: here is the code where I read k from Processor

if (ke != null){
    System.out.println(ke.getID());
    switch (ke.getID()) {
        case KeyEvent.KEY_PRESSED:
            if (ke.getKeyCode() == KeyEvent.VK_W) {
                wPressed = true;
            }
            if (ke.getKeyCode() == KeyEvent.VK_A) {
                aPressed = true;
            }
            if (ke.getKeyCode() == KeyEvent.VK_S) {
                sPressed = true;
            }
            if (ke.getKeyCode() == KeyEvent.VK_D) {
                dPressed = true;
            }
            break;

        case KeyEvent.KEY_RELEASED:
            if (ke.getKeyCode() == KeyEvent.VK_W) {
                wPressed = false;
            }
            if (ke.getKeyCode() == KeyEvent.VK_A) {
                aPressed = false;
            }
            if (ke.getKeyCode() == KeyEvent.VK_S) {
                sPressed = false;
            }
            if (ke.getKeyCode() == KeyEvent.VK_D) {
                dPressed = false;
            }
            break;
    }
}

The problem seems to be the KeyboardFocusManager isn't working properly. Whereas normally ke should be a KeyEvent, the KeyboardFocusManager isn't sending the KeyEvents to the KeyEventDispatcher, so ke becomes null. I was wondering whether there were any alternatives to the KeyEventDispatcher that would also achieve what I want, or if there is another problem. Any help would be appreciated. Thanks!