Solution for wrong characters in KeyEvents generated with ALT method

Question

Hi everybody!
There is still a problem with KeyEvents coming from a barcode scanner using ALT + NumPad method. Java generates KeyTyped events with random outputs when ALT key is pressed. The issue seems to have creeped in somewhere between JSE 6u3 and 6u10, as in the former it works as expected and in the latter it does not. The problem persists still, we also tested it with Java 8 (on Windows 8, Windows 7 and Ubuntu 14). The actual test client is very simple, the application is only a JFrame containing a JTextField and a JTextArea.
The old thread: Wrong characters in KeyEvents generated from input of barcode scanner
My solution is to register a KeyEventDispatcher that blocks the KeyEvents when the ALT method is active:
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(
  new AltBugFixKeyEventDispatcher());
public class AltBugFixKeyEventDispatcher implements KeyEventDispatcher {
    private int i = -1;
    @Override
    public boolean dispatchKeyEvent(KeyEvent ke) {
        if (ke.isAltDown()) {
            switch (ke.getID()) {
                case KeyEvent.KEY_PRESSED:
                    if(ke.getKeyCode() == KeyEvent.VK_ALT){
                        i = 0;
                    }else if(Character.isDigit(ke.getKeyChar())){
                        i++;
                    }else{
                        i = -1;
                    break;
                case KeyEvent.KEY_RELEASED:
                    break;
                case KeyEvent.KEY_TYPED:
                    break;
            if(i != -1){
                return true;
        return false;

Answer 1

Hi everybody!
There is still a problem with KeyEvents coming from a barcode scanner using ALT + NumPad method. Java generates KeyTyped events with random outputs when ALT key is pressed. The issue seems to have creeped in somewhere between JSE 6u3 and 6u10, as in the former it works as expected and in the latter it does not. The problem persists still, we also tested it with Java 8 (on Windows 8, Windows 7 and Ubuntu 14). The actual test client is very simple, the application is only a JFrame containing a JTextField and a JTextArea.
The old thread: Wrong characters in KeyEvents generated from input of barcode scanner
My solution is to register a KeyEventDispatcher that blocks the KeyEvents when the ALT method is active:
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(
  new AltBugFixKeyEventDispatcher());
public class AltBugFixKeyEventDispatcher implements KeyEventDispatcher {
    private int i = -1;
    @Override
    public boolean dispatchKeyEvent(KeyEvent ke) {
        if (ke.isAltDown()) {
            switch (ke.getID()) {
                case KeyEvent.KEY_PRESSED:
                    if(ke.getKeyCode() == KeyEvent.VK_ALT){
                        i = 0;
                    }else if(Character.isDigit(ke.getKeyChar())){
                        i++;
                    }else{
                        i = -1;
                    break;
                case KeyEvent.KEY_RELEASED:
                    break;
                case KeyEvent.KEY_TYPED:
                    break;
            if(i != -1){
                return true;
        return false;