static JPanel jCenteredBackgroundImage(S imageID) {
  ret jCenteredBackgroundImage(loadImage2(imageID));
}

static JPanel jCenteredBackgroundImage(final BufferedImage image) {
  ret swing(func -> JPanel { ret new JPanel {
    protected void paintComponent(Graphics g) {  
      paintCenteredBackgroundImage(this, g, image);
    }
  }; });
}
  
static JPanel jCenteredBackgroundImage(S imageID, Component contents) {
  ret jCenteredBackgroundImage(loadImage2(imageID), contents);
}
  
static JPanel jCenteredBackgroundImage(final BufferedImage image, final Component contents) {
  ret swing(func -> JPanel {
    JPanel panel = jCenteredBackgroundImage(image);
    panel.setLayout(new BorderLayout);
    panel.add(BorderLayout.CENTER, jtransparent_recursive(contents));
    ret panel;
  });
}

Began life as a copy of #1006894