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Java - transparent JFrame, no libs restrictions

Yes, this question is everywhere. But all (working) solutions use the AWTUtilities toolkit, which is limited.

So. I just want to control the opacity of my window. No need to shape or decompose. Just a transparent contentPane (simple) and a transparent JFrame background (ridiculously complicated).

I could have sworn I got the right combination yesterday, but now I can’t reproduce it. There are also some solutions that do not use AWTUtilities, but they do not work ... does anyone have a good solution?

Example of my failed code:

public static void main(String[] args) {
    JFrame test = new JFrame();
    test.setSize(400, 400);
    test.setLocationRelativeTo(null);
    test.setUndecorated(true);
    test.setBackground(new Color(0, 0, 0, 0));
    test.getContentPane().setBackground(new Color(0,0,0,0));
    test.setVisible(true);
}

but it just makes a white square. Close, but not a cigar. I also tried overriding the drawing method, and someone was saying something about discarding the alpha channel, but that made it black (of course). So ... Qaru it.

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public class gui {
    public frame f;
    public String name = "Transparent?"; //name your frame *
    public JButton exit = new JButton("Exit");
    public gui(){ //non-static context
        f = new  JFrame(name);
        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //*
        f.setLocationRelativeTo(null);
        f.setExtendedState(f.getExtendedState() | JFrame.MAXIMIZED_BOTH);
        //maximizes window. if you dont want it, f.setSize(int, int)
        f.setUndecorated(true); //necessary for setOpacity
        f.setOpacity(.7f); //achieve trasparancy
        f.setVisible(true); //show window
        exit.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent arg0){
                System.exit(0);
            }
        });
        f.add(exit, BorderLayout.CENTER); 
        //since X is not available in the window, make a button to exit
    }

    public static void main(){
        new gui();
    }
}
//* Note: since the default Window manager is set off with setUndecorated(true),
// the name and buttons won't really show.
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