A very simple to create a world border in minecraft 1.8 (until the world border command works right)

BattleMode.java

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.StringSelection;
import java.awt.event.KeyEvent;

/**
 *
 * @author b0b & Kilvean
 */
public class BattleMode {
    public static Robot robot;

    public static void main(String[] args) throws AWTException, InterruptedException {
        robot = new java.awt.Robot();
        BattleMode.sleep(5000);
        final int width = 200;
        final int start_x = -169;
//        final int start_y = ;
        final int start_z = 223;

        for (int i=0; i<10; ++i){
            BattleMode.type("/fill " +(start_x-100)+ " 1 " +(start_z-100+i*20)+ " " +(start_x-100)+ " 200 " +(start_z-100+(i+1)*20-1)+ " barrier");
            BattleMode.sleep(100);
            BattleMode.type("/fill " +(start_x-100+i*20)+ " 1 " +(start_z+100)+ " " +(start_x-100+(i+1)*20-1)+ " 200 " +(start_z+100)+ " barrier");
            BattleMode.sleep(100);
            BattleMode.type("/fill " +(start_x+100)+ " 1 " +(start_z-100+i*20)+ " " +(start_x+100)+ " 200 " +(start_z-100+(i+1)*20-1)+ " barrier");
            BattleMode.sleep(100);
            BattleMode.type("/fill " +(start_x-100+i*20)+ " 1 " +(start_z-100)+ " " +(start_x-100+(i+1)*20-1)+ " 200 " +(start_z-100)+ " barrier");
            BattleMode.sleep(100);
//            BattleMode.type("/fill " +(start_x-100+i*20)+ " 200 " +(start_z-100)+ " " +(start_x-100+(i+1)*20-1)+ " 200 " +(start_z+100)+ " barrier");
//            BattleMode.sleep(1000);
        }
    }

    public static void sleep(long seconds) throws InterruptedException {
        Thread.sleep(seconds);
    }

    public static void type(String characters) {
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        StringSelection stringSelection = new StringSelection( characters );
        clipboard.setContents(stringSelection, null);
        robot.keyPress(KeyEvent.VK_CONTROL);
        robot.keyPress(KeyEvent.VK_V);
        robot.keyRelease(KeyEvent.VK_V);
        robot.keyRelease(KeyEvent.VK_CONTROL);
        robot.keyPress(KeyEvent.VK_ENTER);
        robot.keyRelease(KeyEvent.VK_ENTER);
    }

    /**
     * Debug functions. Rename the other function to type1 and sleep1 and these to type and sleep
     */
    public static int counter = 0;
    public static void type1(String c){
        System.out.println((counter++) + ": " +c);
    }

    public static void sleep1(long seconds){
        return;
    }

}