Following test fails because frame's icon is set.

import java.awt.*;
import java.io.*;

public class ImageBug {
    public static void main(String[] args) {
       
        Image img = Toolkit.getDefaultToolkit().getImage("Button.gif");
        System.out.println("Img = " + img);
 
        Frame f = new Frame("Button");
        f.setIconImage(img);
        try {
            ObjectOutputStream os = new ObjectOutputStream(
                                        new ByteArrayOutputStream());
            os.writeObject(f);
            os.close();
            System.out.println("OK");
        } catch (Exception e) {
            e.printStackTrace(System.out);
        }
    }    
}