Here is the test case:
When resize the container which has a JScrollPane, the margin which was set through Insets is not updated. It happens only when resize vertically.

To re-generate it follow these steps.
- Try to resize the main frame vertically up and down by your mouse.

//
// Test Case By Kim Bae-Chul
//

import java.awt.*;
import java.io.*;
import java.util.*;
import java.awt.event.*;
import com.sun.java.swing.*;
import com.sun.java.swing.border.*;


public class Test extends JFrame
{
    public Test(){
        super("Test Suite");
        setBackground(Color.lightGray);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBorder(new EmptyBorder(new Insets(30,10,30,10)));
scrollPane.getViewport().add(new SourcePanel());


        add("Center", scrollPane);
setSize(200, 200);
        show();
    }

    public static void main(String args[]){
        Test frame = new Test();
    }
}


class SourcePanel extends JPanel
{
    JLabel id, name, size, location, locOnScreen, font, background, foreground;

    public SourcePanel(){
        super();
setLayout(new GridLayout(8, 1));
        setBorder(new TitledBorder(" Source "));

add(id = new JLabel("Current Event ID: "));
add(name= new JLabel(" Name: "));
add(size = new JLabel("Size: "));
add(location = new JLabel("Location: "));
add(locOnScreen = new JLabel(" LocationOnScreen: "));
add(font = new JLabel(" Font: "));
add(background = new JLabel(" Background: "));
add(foreground = new JLabel(" Foreground: "));
}

}