How do I set hard limit on a JComponent when setMaximumSize() and setPrefferedSize() don’t work?

In this example, the internal frame will initially be no more than MAX_SIZE pixels. Smaller pictures will be sized so that scrolling is not required.

Addendum: Reading the title more closely, you may also want to limit the internal frame’s maximum size:

internalFrame.setMaximumSize(new Dimension(fooLabel.getPreferredSize()));

Addendum: This variation may help clarify the problem. With the default layout, BorderLayout.CENTER, the scroll bars appear as required, but the MouseListener does not behave as desired. With a layout that respects preferred sizes, FlowLayout, the MouseListener reports correctly, but the the scroll bars never appear, as the label’s preferred size never changes. I’ve added synthetic images for convenience.

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;

class PictureFrame extends JFrame {

    private static final String NAME = "image.jpg";

    public PictureFrame() {
        JDesktopPane dtp = new JDesktopPane();
        dtp.add(new MyFrame("Large", FauxImage.create(300, 500), 50));
        dtp.add(new MyFrame("Small", FauxImage.create(200, 200), 25));
        this.add(dtp);
    }

    private static class MyFrame extends JInternalFrame {

        private static final int MAX_SIZE = 256;

        public MyFrame(String title, Image image, int offset) {
            super(title, true, true, true, true);
            //this.setLayout(new FlowLayout());
            final JLabel label = new JLabel(new ImageIcon(image));
            this.add(new JScrollPane(label));
            this.pack();
            int w = Math.min(MAX_SIZE, image.getWidth(null));
            int h = Math.min(MAX_SIZE, image.getHeight(null));
            Insets i = this.getInsets();
            this.setSize(w + i.left + i.right, h + i.top + i.bottom);
            this.setLocation(offset, offset);
            this.setVisible(true);
            label.addMouseListener(new MouseAdapter() {

                @Override
                public void mouseEntered(MouseEvent me) {
                    if (me.getSource() == label) {
                        System.out.println("Entered.");
                    }
                }

                @Override
                public void mouseExited(MouseEvent me) {
                    if (me.getSource() == label) {
                        System.out.println("Exited.");
                    }
                }
            });
        }
    }

    private static class FauxImage {

        static public Image create(int w, int h) {
            BufferedImage bi = new BufferedImage(
                w, h, BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2d = bi.createGraphics();
            g2d.setPaint(Color.lightGray);
            g2d.fillRect(0, 0, w, h);
            g2d.setColor(Color.black);
            String s = w + "\u00D7" + h;
            int x = (w - g2d.getFontMetrics().stringWidth(s)) / 2;
            g2d.drawString(s, x, 24);
            g2d.dispose();
            return bi;
        }
    }

    public static void createAndShowGUI() {
        PictureFrame frame = new PictureFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("PictureFrame");
        frame.setSize(640, 400);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                createAndShowGUI();
            }
        });
    }
}