Undecorated JFrame versus JWindow

I've only just discovered undecorated JFrames. Thy solve some of the
problems I'd had with JWindows before, such as not being suitable
parents for JDialogs.

In fact, I don't have any reason to use JWindow at all any more. For
the kind of things I do.

Are there situations where it is better to use JWindow rather than
JFrame?

.