Why isn't JMenu always on top?

Question

The JMenu behaves normally until a JButton is used to update a JTable on the JFrame. Then the JMenu is mostly hidden by a JPanel (see images below). Shouldn\'t the JMenu alw

Answer 1

I'd suggest reading Mixing Heavyweight and Lightweight Components for more information.

Answer 2

Probably because you are using a Canvas when you should be using a JPanel. Canvas is an AWT component and is painted on top of Swing components. Don't use AWT components in a Swing application.

Edit:

If you really need to use an AWT component then you need a current release of the JDK. See Mixing Heavy and Light Components.