See RT-38778 for more details. Sample:

public class Hello {
    static class KeyPair {
        private String character;
        private KeyCode code;

        KeyPair(String character, KeyCode code) {
            this.character = character;
            this.code = code;
        }
    }

    public static void main(String[] args) {
        new JFXPanel(); // initialize JavaFX

        for (KeyPair kp : Arrays.asList(new KeyPair("\n", KeyCode.ENTER), new KeyPair("\t", KeyCode.TAB))) {
            KeyCharacterCombination kcc = new KeyCharacterCombination(kp.character);
            KeyEvent event = new KeyEvent(KeyEvent.KEY_PRESSED, kp.character, "", kp.code, false, false, false, false);
            System.out.println("KeyCode." + kp.code.getName() + " matches: " + kcc.match(event)); // true (!!!)
        }

        Platform.exit();
    }
}