Unreliable Clipboard Event Handling in Java Program

Question

I am currently working on a Java program that listens to clipboard events. The goal is to trigger a specific method whenever the user copies something to the clipboard (Ctrl + C). However, I'm encountering issues where the method (startClipboardListener) is not consistently being called when expected.

I would greatly appreciate any insights or suggestions on how to optimize my program to ensure that the method is reliably triggered every time something is copied to the clipboard. If anyone has encountered similar challenges or has expertise in clipboard event handling, your guidance would be invaluable.

public static void main(String[] args) {
    Userinterface window = new Userinterface();
    window.open();
}

public void open() {
    createContents();
    shell.open();
    shell.layout();
    startClipboardListener();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
}

private void startClipboardListener() {
    Toolkit.getDefaultToolkit().getSystemClipboard().addFlavorListener(new FlavorListener() {
        @Override
        public void flavorsChanged(FlavorEvent e) {
                Display.getDefault().asyncExec(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                            String clipboardText = (String) clipboard.getData(DataFlavor.stringFlavor);
                            handleClipboardChange(clipboardText);
                        } catch (HeadlessException | UnsupportedFlavorException | IOException ex) {
                            handleConsoleOutput("Fehler beim Öffnen der Website");
                        }
                    }
                });
            }
    });
}

private void handleClipboardChange(String clipboardText) {
    String formattedClipboardText = "Clipboard-Inhalt: " + clipboardText;
    handleConsoleOutput(formattedClipboardText);

    browserOpener.openBrowsersBySelection(clipboardText, btnChrome.getSelection(), btnFirefox.getSelection(), btnOperaGx.getSelection(), btnEdge.getSelection());
}

private void handleConsoleOutput(String newText) {
    String currentText = consoleOutputTextArea.getText();
    consoleOutputTextArea.setText(currentText + "\n" + newText);
}