Windows System Menu JNI?

Question

I have an application that when running on a mac supplies an NSApplication delegate that provides a dock menu. I would like to do the same thing for Windows.
Ideally, this means I'd like a class that has a method that takes a JMenu and proxies its menu items (including submenus) over to the menu you get from the Win32 GetSystemMenu() call in user32.lib.
Yes, I could use a notification area icon - there are open source implementations of that - but it's not really apropos for this application. I'm not really a Windows programmer, so it would be double-plus-good if there was an open-source project that did this.
Has this been done before?

Answer 1

Actually, even better would be if the class in question took an object that was a menu provider. That is, you would do something like this:
class mySystemMenu extends JMenu implements SystemMenuFactory {
public JMenu getSystemMenu() {
// do any required setup
return this;
// insert JMenu implementation here
// then... later on inside the actual code...
SystemMenuProvider.connect(this.myWindow, new mySystemMenu());
// From then on, whenever the system menu is brought up, getSystemMenu() in the mySystemMenu instance will get called to set things up, and the JMenu that comes back gets provided as the actual system menu.