Focus not working properly

package scripts.Test;

import org.tribot.api.input.Mouse;
import org.tribot.script.Script;
import org.tribot.script.ScriptManifest;

import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;


@ScriptManifest(authors = "IceKontroI",
                name = "Focus tester",
                category = "@ utils", description = "Tests the focus gain/loss events.")
public class FocusTester extends Script implements FocusListener {

    @Override
    public void run() {

        this.setLoginBotState(false);

        Mouse.move(new Point(100, 100));
        Mouse.click(1);
        Mouse.leaveGame(true);

        System.out.println("Try clicking the client, and then clicking something in the background.");
        System.out.println("You cannot manually fire focusGained() or focusLost() even though it should.");

        while (true) {
            sleep(100);
        }
    }

    @Override
    public void focusGained(FocusEvent e) {
        System.out.println("Focus was gained");
    }

    @Override
    public void focusLost(FocusEvent e) {
        System.out.println("Focus was lost");
    }
}