How to find JDialog(s) that have JFrame owner

Question

I have an application with a single JFrame container, holding a JPanel which represents one functional component in the app suite. When I get a RuntimeException, I want to close the current JPanel and return the application to a login prompt. That much I can handle.
I call frame.removeAll() to remove all the components in the frame. However, in a situation where a dialog is displayed, which may in turn launch another dialog, removeAll() does not dismiss or dispose any JDialogs which have this frame as the owner, or are descendants of this frame..
Is there a way to do this? Also, (of course) the second -nth dialog would have the n-1 dialog as its owner.
I thought of finding the focus, getting its parent that is a JDialog, and calling dispose, until I get to the JFrame. However, SwingUtilities.findFocusOwner(frame) returns null on the 1st call.

Answer 1

Calling frame.removeAll() only removes the components contained within it, which in this case are the components that were added to its rootpane. It will not dispose of your dialogs, even if the frame is the "parent" to those dialogs. This is because those dialogs only contain a reference to the parent (frame, in this case), but the frame itself doesn't know that those dialogs are holding references to it.
The solution here is to explicitly dispose of those dialogs next to the code where you call frame.removeAll(), meaning that you should also keep references to those dialog objects so that you can make calls to dispose of them.
Or, if you want a custom removeAll() method on frame to dispose of those dialogs, then make an object which: 1) extends from JFrame, 2) holds references to those dialogs, and 3) overrides the removeAll() method to call super.removeAll() and then makes calls to dispose of those dialogs.