Final Variable changed on runtime...

Question

Hello, I recently did a test with my program, which involved the use of 32 clients connecting to a server from a single application, however on runtime, the some final variables had their values changed, for example
private static final Point point1 = new Point(100,100);
had changed values to 480,360, and the default Point in my Point class had changed it's value from 0,0 to another value as well. How is this possible? The only methods used on the finalized point was equals/distance, which both do not affect the private fields of point, yet they were changed after logging in about 29 clients or so.
    public int distance(Point p2)
        return Math.max(Math.abs(p2.x - x), Math.abs(p2.y - y));
    public boolean equals(Point p)
        return (p.x == x && p.y == y);
    public boolean equals(Object obj)
        if (obj instanceof Point)
            return (((Point) obj).x == x && ((Point) obj).y == y);
        return false;
    }And here is where they are used
    private static final Point mine = new Point(167, 105);...
                    if (!cLoc.equals(mine))
                        if (cLoc.distance(mine) <= 18)
                            Player.jump(mine);
                            Player.Mine();
                            lastMineTime = 0;
                    }Any idea why this happened?

Answer 1

Sorry, I was not clear enough
Here is my Point class
http://pastebin.com/m6075a9d8
Now, after logging on about 38 clients (about 204 threads lol....), the constant fields get changed, for example within the point class, the "DEFAULT" gets changed to a random variable (which never happened before when logging on 10-20 only)
Same goes for my other constant variables, their values get changed.
For Example these Points:
    private static final Point sellPoint = new Point(417, 357);
    private static final Point mineExit = new Point(156, 90);
    private static final Point mineExitPoint = new Point(53, 399);
    private static final Point mineEntrance = new Point(45, 397);
    private static final Point mine = new Point(167, 105);Would get changed to something totally different, while the only functions used on those points are equals/distance.
Here is an image of the Point instance while in debug mode:
http://img193.imageshack.us/img193/6774/javaerror.jpg
As you can see , mineExit takes the place of mineExitPoint (however I don't know why..), and mineExitPoint remains the same.....
Another image:
http://img6.imageshack.us/img6/9088/javaerror2.jpg
Edit: Could it be the fact that around 30 threads are checking the same static/final variable at once?
Edited by: Naki on Jul 1, 2009 6:43 PM