Copying a world doesnt work

hey, i want to make a ffa world. on /reset i want to delete the world, and copy over an existing world from by Backup Folder.

i tried like this:

Code:

for (Player players : Bukkit.getOnlinePlayers()) {
               players.kickPlayer("Welt wird zurückgesetzt...");
                players.sendMessage("§7[§bFFA§7] §bDie Welt wird zurückgesetzt. Bitte warte einen Moment...");
            }
            Bukkit.getScheduler().runTaskLater(Main.getPlugin(), new Runnable() {
                @Override
                public void run() {
                    Bukkit.unloadWorld("world", true);
                }
            }, 100L);
            Bukkit.getScheduler().runTaskLater(Main.getPlugin(), new Runnable() {
                @Override
                public void run() {
                    File from = new File("Backup/world/");
                    File to = new File("world/");

                    try {
                        FileUtils.deleteDirectory(new File("/world"));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    try {
                        FileUtils.forceMkdir(new File("/world"));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    try {
                        FileUtils.copyDirectory(from, to);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    Main.getPlugin().getServer().createWorld(new WorldCreator("world"));
                }
            }, 200L);

but its spamming this error into console:

Code:

[13:36:25 WARN]: net.minecraft.server.v1_8_R1.ExceptionWorldConflict: The save for world located at ./world is being accessed from another location, aborting
[13:36:25 WARN]:        at net.minecraft.server.v1_8_R1.WorldNBTStorage.checkSession(WorldNBTStorage.java:72)
[13:36:25 WARN]:        at net.minecraft.server.v1_8_R1.World.checkSession(World.java:2786)
[13:36:25 WARN]:        at net.minecraft.server.v1_8_R1.WorldServer.a(WorldServer.java:934)
[13:36:25 WARN]:        at net.minecraft.server.v1_8_R1.WorldServer.save(WorldServer.java:906)
[13:36:25 WARN]:        at org.bukkit.craftbukkit.v1_8_R1.CraftWorld.save(CraftWorld.java:731)
[13:36:25 WARN]:        at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:659)
[13:36:25 WARN]:        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:537)
[13:36:25 WARN]:        at java.lang.Thread.run(Thread.java:748)

 

how long does this take usually? or can i check that? because i am already giving it 10 seconds to unload... should not take so much time i think

 

@timtower
Still the same Error. Spamming about 20-30 times in the console. Im showing the full class:

Code:

package de.rivex.ffa.commands;

import org.apache.commons.io.FileUtils;
import org.bukkit.Bukkit;
import org.bukkit.WorldCreator;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import java.io.File;
import java.io.IOException;

@Deprecated
public class FFAReset implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (sender instanceof Player) {
            if (args.length == 0) {
                for (Player players : Bukkit.getOnlinePlayers()) {
                    players.kickPlayer("Welt wird zurückgesetzt...");
                    players.sendMessage("§7[§bFFA§7] §bDie Welt wird zurückgesetzt. Bitte warte einen Moment...");
                }
                Bukkit.getScheduler().runTaskLater(Main.getPlugin(), new Runnable() {
                    @Override
                    public void run() {
                        Bukkit.unloadWorld("world", true);
                        File from = new File("Backup/world/");
                        File to = new File("world/");

                        try {
                            FileUtils.deleteDirectory(new File("/world"));
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        try {
                            FileUtils.forceMkdir(new File("/world"));
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                        try {
                            FileUtils.copyDirectory(from, to);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        Main.getPlugin().getServer().createWorld(new WorldCreator("world"));
                    }
                }, 100L);
            }
        }
        return false;
    }
}

 

alright ive got it working with this in my command-class:

Code:

 if (sender instanceof Player) {
            if (args.length == 0) {
                for (Player players : Bukkit.getOnlinePlayers()) {
                    players.kickPlayer("Welt wird zurückgesetzt...");
                    players.sendMessage("§7[§bFFA§7] §bDie Welt wird zurückgesetzt. Bitte warte einen Moment...");
                }
                Bukkit.getScheduler().runTaskLater(Main.getPlugin(), new Runnable() {
                    @Override
                    public void run() {
                        Bukkit.unloadWorld("world", true);
                        Main.getPlugin().getConfig().set("reset", true);
                        Bukkit.shutdown();
                    }
                }, 100L);
            }
        }

and this in my onEnable:

Code:

 File from = new File("Backup/world/");
        File to = new File("world/");

        try {
            FileUtils.deleteDirectory(new File("/world"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            FileUtils.forceMkdir(new File("/world"));
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            FileUtils.copyDirectory(from, to);
        } catch (IOException e) {
            e.printStackTrace();
        }
        getConfig().set("reset", false);

Edit: @timtower nevermind, it only resets a few chunks, the rest doesnt get resetted. why?