ADDITIONAL SYSTEM INFORMATION :
Windows 10
JavaFX 17
OpenJDK 11.0.11

A DESCRIPTION OF THE PROBLEM :
KeyCharacterCombinations for symbols like '+', '\' and '-' can fail on non-US keyboards. The Windows implementation of the Toolkit call getKeyCodeForChar uses a fixed table which is only valid for US QWERTY. This causes a mismatch between the way getKeyCodeForChar works and the way key codes are assigned when a KeyEvent is generated.

The test application constructs a KeyCharacterCombination for each KeyTyped event and verifies that the combination matches the KeyPressed event that generated the character.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the attached test.
Switch to a German keyboard layout.
Press the German '+' key (where right bracket is on a US keyboard).
Press the German '#' key (where back slash is on a US keyboard).

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The log area should show these messages:
Passed: key code Plus matched +
Passed: key code Number Sign matched #
ACTUAL -
The log area shows these messages:
* Failed: key code Plus did not match +
* Failed: key code Number Sign did not match #


---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.control.TextArea;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyCombination;
import javafx.scene.input.KeyCharacterCombination;
import javafx.scene.input.KeyEvent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class CharComboTest extends Application {
    private final TextArea typingArea = new TextArea("");
    private KeyEvent lastPressed = null;

    public static void main(String[] args) {
        Application.launch(args);
    }

    @Override
    public void start(Stage stage) {
        typingArea.setEditable(false);
        typingArea.appendText("Shifted punctuation keys are most likely to fail.\nKeys that don't generate text will be ignored.\n\n");

        typingArea.addEventFilter(KeyEvent.KEY_PRESSED, this::pressedEvent);
        typingArea.addEventFilter(KeyEvent.KEY_RELEASED, this::releasedEvent);
        typingArea.addEventFilter(KeyEvent.KEY_TYPED, this::typedEvent);

        Scene scene = new Scene(typingArea, 640, 640);
        stage.setScene(scene);
        stage.setTitle("Key Character Combinations");
        stage.show();

        Platform.runLater(typingArea::requestFocus);
    }

    // Helper Methods for Event Handling
    private void passed(String str) {
        typingArea.appendText("Passed: " + str + "\n");
    }

    private void failed(String str) {
        typingArea.appendText("* Failed: " + str + "\n");
    }

    private void ignored(String str) {
        typingArea.appendText("Ignored: " + str + "\n");
    }

    private void pressedEvent(KeyEvent e) {
        lastPressed = e;
    }

    private void releasedEvent(KeyEvent e) {
        lastPressed = null;
    }

    private KeyCombination.ModifierValue boolToModifier(boolean down)
    {
        if (down)
            return KeyCombination.ModifierValue.DOWN;
        return KeyCombination.ModifierValue.UP;
    }

    private void typedEvent(KeyEvent e) {
        if (lastPressed == null)
            return;
        if (e.getCharacter().isEmpty())
            return;
        
        // Keys that only generate characters with diacritics are not assigned key codes.
        if (lastPressed.getCode() == KeyCode.UNDEFINED)
        {
            ignored("undefined key code for " + e.getCharacter());
            return;
        }

        // Keys on the numeric keypad will not match.
        if (lastPressed.getCode().isKeypadKey()) {
            ignored("keypad code " + lastPressed.getCode().getName() + " generated " + e.getCharacter());
            return;
        }

        KeyCombination.ModifierValue shiftModifier = boolToModifier(lastPressed.isShiftDown());
        KeyCombination.ModifierValue controlModifier = boolToModifier(lastPressed.isControlDown());
        KeyCombination.ModifierValue altModifier = boolToModifier(lastPressed.isAltDown());
        KeyCombination.ModifierValue metaModifier = boolToModifier(lastPressed.isMetaDown());
        KeyCombination.ModifierValue shortcutModifier = boolToModifier(lastPressed.isShortcutDown());

        KeyCharacterCombination combination = new KeyCharacterCombination(e.getCharacter(),
            shiftModifier, controlModifier, altModifier, metaModifier, shortcutModifier);

        String combinationDescription = combination.getDisplayText();
        if (lastPressed.getCode().isWhitespaceKey())
        {
            if (!combinationDescription.isEmpty())
                combinationDescription = combinationDescription.substring(0, combinationDescription.length() - 1);
            combinationDescription += lastPressed.getCode().getName();
        }
        
        if (combination.match(lastPressed))
            passed("key code " + lastPressed.getCode().getName() + " matched " + combinationDescription);
        else
            failed("key code " + lastPressed.getCode().getName() + " did not match " + combinationDescription);
    }
}

---------- END SOURCE ----------

FREQUENCY : always