Code:
button.setOpaque(false);
button.setFocusPainted(false);
button.setBorderPainted(false);
button.setContentAreaFilled(false);
setBorder(BorderFactory.createEmptyBorder(0,0,0,0));
setBorder(null) might work, but there is a bug sun explaining it is by design that the UI set a border on a component unless the client sets a non-null border which does not implement the UIResource interface.
Rather than the JDK itself setting the border to an EmptyBorder when null is passed in, the clients should set an EmptyBorder themselves (a very easy workaround). That way there is no confusion about who's doing what in the code.
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