MouseExited on JPanel runs when JButton in panel hovered over?

I don't think what you want is doable - internal controls intercept mouse events. So you can either create a mouse listener and attach it to panel, buttons, etc, and handle the stuff properly everywhere check the coordinate at mouseExited(), and if the mouse is still inside the panel, ignore that event.

I tested this too, and was surprised to find the same results. I guess Java's components don't handle mouse-in and mouse-out events in the same way as JavaScript and HTML does (via event bubbling). Using a different layout manager didn't have any effect.

I think this is the safest way to handle the issue: create a custom JPanel class the overrides the add() methods. This delegates to super.add() but also adds its custom mouse listener to each component that gets passed in. This way, you will still get the mouse-entered and mouse-exited events but you will be able to keep track of elements inside the panel.

Whatever you do when the mouse exits the panel will only take effect very briefly and will be undone immediately when the next event fires. You shouldn't see any visible change to the GUI, but if you see a flicker, try making your window double-buffered.

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