Java version: 1.4.0
Frames cannot be shown initially maximized due to inset calculation/resize
dance (this makes Window Manager think that after maximization, another resize
happened). There was a similar bug filed against Windows platform (4464714), but
it was caused by different reasons, and is now fixed.

Test case:
===
import javax.swing.*;

public class Maxim extends JFrame
{
 public static void main(String args[])
 {
  new Maxim();
 }

 public Maxim()
 {
  setDefaultCloseOperation(EXIT_ON_CLOSE);
  setExtendedState(MAXIMIZED_BOTH);
  show();
 }
}
===