How can I disable middle-click paste in a Java Swing application?

I am using the middle mouse button for an autoscroller in a Java Swing application. However, when I middle-click on a text component, on Linux it pastes the last selected text, which is unwanted. How can I disable this?

This behavior is implemented in javax.swing.text.DefaultCaret.mouseClicked. It has no obvious off switch.

As a workaround, run this block once at application startup. It clears the "selection" clipboard upon middle-click.

if (Toolkit.getDefaultToolkit().getSystemSelection() != null) {
    Toolkit.getDefaultToolkit().addAWTEventListener((AWTEvent e) -> {
        try {
            if (e.getID() == MouseEvent.MOUSE_CLICKED && ((MouseEvent)e).getButton() == MouseEvent.BUTTON2) {
                Toolkit.getDefaultToolkit().getSystemSelection().setContents(new StringSelection(""), null);
            }
        } catch (Throwable t) {} // any error here not worth blocking application
    }, AWTEvent.MOUSE_EVENT_MASK);
}