How to fully delete world!

Hello i'm currently developing a plugin for a server. And after each match the players are all teleported out of the world to the main world and the world attempts to delete itself and the regenerate. But I Can Get All The Region Files To Be Unloaded And It Fails To Delete The World.
Here is My Current Code!

Code:

package me.GamersMods.MobAPA;
 
import java.io.File;
import java.util.Map;
 
import net.minecraft.server.v1_5_R3.MinecraftServer;
 
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Chunk;
import org.bukkit.World;
import org.bukkit.World.Environment;
import org.bukkit.WorldCreator;
import org.bukkit.craftbukkit.v1_5_R3.CraftServer;
import org.bukkit.craftbukkit.v1_5_R3.CraftWorld;
import org.bukkit.entity.Player;
 
import com.mysql.jdbc.Field;
 
public class WorldGenerator
{
    public static boolean WorldCreated = true;
   
 
    static File directory = new File("MobAPA");
   
   
    public static void DeleteWorld(World world)
    {
        if(Bukkit.getWorld("MobAPA").getLoadedChunks() != null && Bukkit.getWorld("MobAPA").getLoadedChunks().length > 0){
            for(Chunk c : Bukkit.getWorld("MobAPA").getLoadedChunks()){
                c.unload(false, true);
            }   
            Bukkit.unloadWorld("MobAPA", false);
            System.out.println("Deleting World");
 
            File[] files = directory.listFiles();
           
            for (File file : files)
            {
                file.delete();
               
                if (!file.delete())
                {
                    System.out.println("Failed to delete "+file);
                }
            }
        //    Bukkit.getServer().dispatchCommand(Bukkit.getServer().getConsoleSender(), "mv delete MobAPA");
        //    Bukkit.getServer().dispatchCommand(Bukkit.getServer().getConsoleSender(), "mvconfirm");
            System.out.println("Deleted World");
            WorldCreated = false;
    }
    }
    public static void CreateWorld()
    {
            System.out.println("Creating New World!");
            Bukkit.createWorld(new WorldCreator("MobAPA").environment(Environment.NORMAL));
            //Bukkit.getServer().dispatchCommand(Bukkit.getServer().getConsoleSender(), "mv create MobAPA Normal");
            System.out.println("World Created!");
            WorldCreated = true;
            Bukkit.broadcastMessage(ChatColor.LIGHT_PURPLE + "[MobAPA] " + ChatColor.RED + ChatColor.BOLD +  "World Generated. You May Now Join With" + ChatColor.DARK_AQUA + ChatColor.ITALIC + " /mobjoin");       
    }
   
}

I have been trying multiple things to get this to work please any help will be appreciated or ideas to get around this.

 

I've learned from past mistakes that you need a delay between unloading and deleting a world. Try putting the code which deletes the world in a sync delayed task with a delay of 60 ticks. If that doesn't help, you may find this method enlightening.