This is a regression bug.
The setLocation, getLocation, getLocationOnScreen methods are not working correctly only inside a frame constructor with solaris. They are fine with Win32 implementation.
I am using jdk1.2_beta1 and swing_0.5.1

Here is sample code:

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

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

public class Test extends JFrame
{
    JButton testButton, dialogButton;
    int xx, yy;

    public Test(){
        super("Test Suite");

        setSize(200, 100);
        setLocation(0, 0);
        show();
        addMouseListener(ml);

        System.out.println("Was set at 0, 0");
        Point p = getLocation();
        System.out.println("Reading location");
        System.out.println("x: "+p.x+", Y: "+p.y);
    }

    MouseListener ml = new MouseAdapter(){
        public void mouseClicked(MouseEvent e){
            xx+=1;
            yy+=1;

            setLocation(xx, yy);

            System.out.println("Was set at "+xx+", "+yy);
            Point p = getLocation();
            System.out.println("Reading location");
            System.out.println("x: "+p.x+", Y: "+p.y);
        }
    };


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