Java: using an image as a button

I would like to use an image as a button in Java, and I tried to do this:

BufferedImage buttonIcon = ImageIO.read(new File("buttonIconPath"));
button = new JButton(new ImageIcon(buttonIcon));

But this still shows the actual button behind the image, I would only like the image to function as the button, how can I do this?

Remove the border like so:

button.setBorder(BorderFactory.createEmptyBorder());

and then also the contents¹:

button.setContentAreaFilled(false);

_{¹: Taken from the solution added to the question by @3sdmx}

A suggestion would be to set the Image as a label and add a mouse listener to the label to detect clicks.

Example:

ImageIcon icon = ...;

JLabel button = new JLabel(icon);

button.addMouseListener(new MouseAdapter() {
  @Override
  public void mouseClicked(MouseEvent e) {
     ... handle the click ...
  }
});

buttonIcon.setBorder(new EmptyBorder(0,0,0,0));

button.setBorderPainted( false );