How to creating a transparent, borderless, full-screen JFrame overlay in Java swing

Question

I'm working on a Java application where I need to implement a transparent, borderless JFrame window that overlays other windows while still allowing interaction with underlying windows. Specifically, the overlay window should be fully transparent, borderless, full-screen, and always on top of other windows. However, users should also be able to interact seamlessly with windows behind the overlay.

I've attempted to achieve this using standard Java Swing techniques, but I've encountered limitations in achieving the desired transparency and interaction behavior. Here's what I've tried:

import javax.swing.*;
import java.awt.*;

public class FullScreenGlassPaneExample {
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame();
            
            frame.setUndecorated(true);
            //frame.setAlwaysOnTop(true);
            frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
            //frame.setOpacity(0.8f); 

            frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
            //frame.setFocusableWindowState(false);
            frame.setBackground(new Color(0,0,0,0));
            frame.setEnabled(false);
            frame.setVisible(true);
        });
    }
}

• Created a JFrame with transparency using setOpacity() method, but it doesn't support full transparency.
• Tried setting the background color with an alpha value using setBackground(new Color(0, 0, 0, 100)), but it didn't provide the desired transparency.
• Experimented with setAlwaysOnTop(true) to keep the window on top, but it interfered with interaction with underlying windows.

I was expecting the JFrame to be fully transparent, borderless, and full-screen, allowing seamless interaction with underlying windows. However, I haven't been able to achieve this with my current approach.