Adding JScrollPane to JInternalFrame

Question

Hello, I have been having a rather difficult time adding a a jscrollpane to my jinternalframe. I have a panel that I am adding some objects to. I add that panel to a jscrollpane, then add the jscrollpane to the container of the JInternalFrame. I get no errors, but when I run this thing, the panel spills out over the JInternalFrame, the panel is bigger than the internal frame. When I take the jscrollpane off of it and just add the panel directly to the JInternalFrame, it fits jsut fine. However, I need the scrollbar to view all of the material. Any ideas? Here is a piece of my code.
         JInternalFrame internal = new JInternalFrame("New Tree",true,true,true,true);
      Container c = internal.getContentPane();
//this panel is something I created earlier and have added stuff to it
//panel is of the type java.awt.panel
        panel.setBackground(Color.white);
        JScrollPane jsp = new JScrollPane();
        jsp.setViewportView(panel);
        c.add(jsp);
        internal.setSize(700,400);
        internal.setOpaque(true);
        internal.setVisible(true);
//I add it to a desktop pane a little later on

Answer 1

Here's an example:
import java.awt.*;
import javax.swing.*;
public class InternalFrameTest extends JFrame {
     private JInternalFrame internalFrame1;
     private JInternalFrame internalFrame2;
     private JScrollPane scrollPane;
     private JDesktopPane desktopPane;
     public InternalFrameTest() {
          try {
               setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               desktopPane = new JDesktopPane();
               scrollPane = new JScrollPane(desktopPane);
               desktopPane.setPreferredSize(new Dimension(350, 250));
               internalFrame1 = new JInternalFrame();
               desktopPane.add(internalFrame1);
               internalFrame1.setBounds(30, 30, 100, 100);
               internalFrame1.setVisible(true);
               internalFrame2 = new JInternalFrame();
               desktopPane.add(internalFrame2);
               internalFrame2.setBounds(150, 100, 100, 100);
               internalFrame2.setVisible(true);
               getContentPane().add(scrollPane, BorderLayout.CENTER);
               pack();
               setSize(300, 200);
               setLocationRelativeTo(null);
               setVisible(true);
          } catch (Exception e) { e.printStackTrace(); }
     public static void main(String[] args) { new InternalFrameTest(); }
}