JScrollPane bars to arbitrary size?

panel.add( scrollPane, BorderLayout.CENTER );
In my app, my panel has no components added to it besides the scrollpane above, BUT the public void paint(..) has painted a huge graphic of 8000 pixels horizontally..
How do you set the horizontal bar of the scroll pane to be 8000 pixels?
Thanks.

http://forum.java.sun.com/thread.jsp?forum=1&thread=1968

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There is some problem with my JScrollPane
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Here is a working code...
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;
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               JPanel genpane2 = new JPanel();
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               JTextField gen2tf2 = new JTextField(14);
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               JLabel genname2 = new JLabel("Manufacturers Name:");
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               JPanel genpane5 = new JPanel();
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               JPanel detp2 = new JPanel();
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               JPanel detpane1 = new JPanel();
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               JPanel detpane2 = new JPanel();
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In Java 1.5 or Java6, I have a JScrollPane which contains a JPanel. The settings of the scrollbar (for example, the Extent [the width of the "thumb" or "slider" on the scrollbar]) are determined based on the dimension of the underlying contained component, in particular, the Preferred Size.
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