Swing and Nimbus: Replace background of JPopupMenu (attached to JMenu)

Question

Nimbus often looks great, but for certain color combinations the result is non-optimal. In my case, the background of a JPopupMenu does not fit, which is why I

Answer 1

One way to do it is to color the background of the individual JMenuItems and make them opaque:

JMenuItem a = new JMenuItem("A");
a.setOpaque(true);
a.setBackground(Color.GREEN);

Then give the menu itself a green border to fill the rest:

menu.setBorder(BorderFactory.createLineBorder(Color.GREEN));

There may be an easy/more straightforward way out there, but this worked for me.