With JDK1.2_beta1 and Swing-0.5.1, the left inset was ignored when rendering a component in a container. For example,

The left inset was 30 but LocationPanel didn't layout panel as it is.
The top, bottom, and right insets were fine.
Here is the test case:

//
// 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);

        JPanel panel = new JPanel();
        panel.setBorder(new EmptyBorder(new Insets(30,30,30,30)));
        panel.add(new JButton("Test Button"));

        add(panel);
pack();
        show();

        Insets insets = panel.getInsets();
        System.out.println("Top: "+insets.top);
        System.out.println("Left: "+insets.left);
        System.out.println("Bottom: "+insets.bottom);
        System.out.println("Right: "+insets.right);
    }

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