Java JOptionPane.showMessageDialog custom icon problem?

Question

So I have a pop-up dialog in my application that tells the user about the program. Everything was going fine until the custom icon. Here's what I've attempted:

Attempt 1:

JOptionPane.showMessageDialog(dialog, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, new ImageIcon("home/user/Pictures/default.jpg"));

Attempt 2:

final icon = new ImageIcon("home/user/Pictures/default.jpg"));

    JOptionPane.showMessageDialog(dialog, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);

Attempt 3:

final icon = new ImageIcon("home/user/Pictures/default.jpg"));
showMessageDialog(dialog, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);

Attempt 4:

(Screaming at java)

Attempt 5:

Using URL's

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All have had no affect on the program and instead of an image, I don't get anything.

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Details:

• No exceptions
• The file path DOES exist
• My IDE doesn't return exceptions, NOR any warnings of any sort
• Yes, I've put also tried the path /home/user/Pictures/default.jpg
• .ico's, .png's, .jpg's don't work. I'm not so sure about .gif's right now though.

Help me! :(

Answer 1

This worked for me:

import javax.swing.*;

public class Test
{
    public static void main(String[] args)
    {
        final ImageIcon icon = new ImageIcon("C:\\Users\\John\\Desktop\\lol.jpg");
        JOptionPane.showMessageDialog(null, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);
    }
}

Here is a variant that uses a URL:

import javax.swing.*;
import java.net.*;

public class TestIcon
{
    public static void main(String[] args) throws Exception
    {
        final ImageIcon icon = new ImageIcon(new URL("http://www.gravatar.com/avatar/a1ab0af4997654345d7a949877f8037e?s=128&d=identicon&r=PG"));
        JOptionPane.showMessageDialog(null, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);
    }
}