Q:

can I make JDialog to be modal using native system window as a parent?

I have a JDialog window.
I need to make it modal, but the parent is not Java window, but native Windows OS window.
Is it possible?

A:

No, you can't. You cannot even achieve reference not only to native windows but even to windows created by java application running in other JVM. 
But you can create dummy window (Window, not Frame or JFrame), set its size as 0 and use it as an parent to any dialog. I do not know what is your concrete problem but sometimes the way I mentioned may help.

