import java.awt.AWTException;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JRootPane;

public class SimpleTransFrame2 extends JFrame {
    private Robot robot; 
    private BufferedImage image;

    public SimpleTransFrame2() {
        super();
    }

    public SimpleTransFrame2(String title) {
        super(title);
        init();
    }

    public SimpleTransFrame2(GraphicsConfiguration gc) {
        super(gc);
        init();
    }

    public SimpleTransFrame2(String title, GraphicsConfiguration gc) {
        super(title, gc);
        init();
    }

    private void init() {
        try {
            robot = new Robot();
        } catch (AWTException ex) {
            ex.printStackTrace();
            return;
        }

        setRootPane(new ImageRootPane());

        JComponent content = (JComponent)getContentPane();
        content.setOpaque(false);
    }
    
    public void addNotify() {
        super.addNotify();

        Rectangle bounds = getBounds();
        Insets insets = getInsets();

        bounds = new Rectangle(bounds.x + insets.left,
                               bounds.y + insets.top,
                               bounds.width - insets.left - insets.right,
                               bounds.height - insets.top - insets.bottom);
        image = robot.createScreenCapture(bounds);
    }

    class ImageRootPane extends JRootPane {
        public void paintComponent(Graphics g) {
            g.drawImage(image, 0, 0, this);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new SimpleTransFrame2("Capture Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.getContentPane().setLayout(new FlowLayout());
        frame.getContentPane().add(new JButton("Button"));

        frame.setBounds(100, 100, 400, 200);
        frame.setVisible(true);
    }
}