Below is a test case that shows how KeyCombination matching is broken.
I'm using JDK 8u40-b02 on Linux.

import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.input.KeyCharacterCombination;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;


public class KeyCombinationTest {

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

        KeyCharacterCombination a = new KeyCharacterCombination("a");
        KeyCharacterCombination A = new KeyCharacterCombination("A");
        KeyCharacterCombination b = new KeyCharacterCombination("b");
        KeyCharacterCombination B = new KeyCharacterCombination("B");
        KeyCharacterCombination LF = new KeyCharacterCombination("\n");
        KeyCharacterCombination CR = new KeyCharacterCombination("\r");
        KeyCharacterCombination TAB = new KeyCharacterCombination("\t");

        KeyEvent event = new KeyEvent(KeyEvent.KEY_TYPED, "a", "", KeyCode.UNDEFINED, false, false, false, false);

        System.out.println("a match a: " + a.match(event)); // false (!!!)
        System.out.println("A match a: " + A.match(event)); // true (!!!)
        System.out.println("b match a: " + b.match(event)); // false
        System.out.println("B match a: " + B.match(event)); // true (!!!)
        System.out.println("LF match A: " + LF.match(event)); // true (!!!)
        System.out.println("CR match A: " + CR.match(event)); // true (!!!)
        System.out.println("TAB match A: " + TAB.match(event)); // true (!!!)

        Platform.exit();
    }

}


OUTPUT:

a match a: false
A match a: true
b match a: false
B match a: true
LF match A: true
CR match A: true
TAB match A: true