diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/Main.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/Main.java
index 1be71cc..41337f3 100755
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/Main.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/Main.java
@@ -9,7 +9,7 @@ import eu.mhsl.craftattack.worldmuseum.listener.*;
 import eu.mhsl.craftattack.worldmuseum.skins.SkinCache;
 import eu.mhsl.craftattack.worldmuseum.temp.TablistUpdateTask;
 import eu.mhsl.craftattack.worldmuseum.util.Config;
-import eu.mhsl.craftattack.worldmuseum.util.NewPlayer;
+import eu.mhsl.craftattack.worldmuseum.util.MuseumPlayer;
 import eu.mhsl.craftattack.worldmuseum.handler.SignHandler;
 import eu.mhsl.craftattack.worldmuseum.worlds.World;
 import eu.mhsl.craftattack.worldmuseum.worlds.WorldManager;
@@ -30,10 +30,10 @@ public class Main {
         // Initialization
         System.setProperty("minestom.chunk-view-distance", "8");
         MinecraftServer minecraftServer = MinecraftServer.init();
+        MinecraftServer.getConnectionManager().setPlayerProvider(MuseumPlayer::new);
 
         //temp
         MinecraftServer.getSchedulerManager().scheduleTask(new TablistUpdateTask(), TaskSchedule.tick(20), TaskSchedule.tick(20));
-        MinecraftServer.getConnectionManager().setPlayerProvider(NewPlayer::new);
 
         //load eu.mhsl.craftattack.worldmuseum.worlds / configExample file
         WorldManager worldManager = WorldManager.getInstance();
@@ -57,10 +57,9 @@ public class Main {
         globalEventHandler.addListener(PlayerBlockPlaceEvent.class, new BlockPlaceListener());
         globalEventHandler.addListener(PlayerDisconnectEvent.class, new DisconnectListener());
 
-//        Handlers
+        //Handlers
         MinecraftServer.getBlockManager().registerHandler("minecraft:sign", SignHandler::new);
 
-
         //canceled Events
         globalEventHandler.addListener(PlayerSwapItemEvent.class, new EventCancel<>());
         globalEventHandler.addListener(ItemDropEvent.class, new EventCancel<>());
@@ -72,7 +71,7 @@ public class Main {
         MinecraftServer.getCommandManager().register(new SpawnCommand());
 
         globalEventHandler.addListener(PlayerLoginEvent.class, event -> {
-            final NewPlayer player = (NewPlayer) event.getPlayer();
+            final MuseumPlayer player = (MuseumPlayer) event.getPlayer();
             player.setSyncCooldown(Duration.ofSeconds(3));
             SkinCache.setSkin(player);
             event.setSpawningInstance(startworld);
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockBreakListener.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockBreakListener.java
index 6147446..68fdb4d 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockBreakListener.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockBreakListener.java
@@ -5,7 +5,6 @@ import net.minestom.server.coordinate.Point;
 import net.minestom.server.event.player.PlayerBlockBreakEvent;
 import net.minestom.server.instance.block.Block;
 import net.minestom.server.timer.TaskSchedule;
-
 import java.util.function.Consumer;
 
 public class BlockBreakListener implements Consumer<PlayerBlockBreakEvent> {
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockPlaceListener.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockPlaceListener.java
index 8892f24..ad017e6 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockPlaceListener.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/BlockPlaceListener.java
@@ -2,7 +2,6 @@ package eu.mhsl.craftattack.worldmuseum.listener;
 
 import eu.mhsl.craftattack.worldmuseum.worlds.World;
 import net.minestom.server.event.player.PlayerBlockPlaceEvent;
-
 import java.util.Objects;
 import java.util.function.Consumer;
 
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ChunkUnloading.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ChunkUnloading.java
index e5a2d28..7afa63f 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ChunkUnloading.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ChunkUnloading.java
@@ -1,7 +1,6 @@
 package eu.mhsl.craftattack.worldmuseum.listener;
 
 import net.minestom.server.event.player.PlayerChunkUnloadEvent;
-
 import java.util.function.Consumer;
 
 public class ChunkUnloading implements Consumer<PlayerChunkUnloadEvent> {
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/DisconnectListener.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/DisconnectListener.java
index 3cc3ddf..db971e8 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/DisconnectListener.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/DisconnectListener.java
@@ -1,7 +1,6 @@
 package eu.mhsl.craftattack.worldmuseum.listener;
 
 import net.minestom.server.event.player.PlayerDisconnectEvent;
-
 import java.util.function.Consumer;
 
 public class DisconnectListener implements Consumer<PlayerDisconnectEvent> {
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/EventCancel.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/EventCancel.java
index 6132204..99cfb2e 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/EventCancel.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/EventCancel.java
@@ -1,7 +1,6 @@
 package eu.mhsl.craftattack.worldmuseum.listener;
 
 import net.minestom.server.event.trait.CancellableEvent;
-
 import java.util.function.Consumer;
 
 public class EventCancel<T extends CancellableEvent> implements Consumer<T> {
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/InventoryClickListener.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/InventoryClickListener.java
index 253f6bc..ee58547 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/InventoryClickListener.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/InventoryClickListener.java
@@ -1,18 +1,17 @@
 package eu.mhsl.craftattack.worldmuseum.listener;
 
-import eu.mhsl.craftattack.worldmuseum.util.NewPlayer;
+import eu.mhsl.craftattack.worldmuseum.util.MuseumPlayer;
 import eu.mhsl.craftattack.worldmuseum.util.ChangeWorld;
 import eu.mhsl.craftattack.worldmuseum.worlds.World;
 import eu.mhsl.craftattack.worldmuseum.worlds.WorldManager;
 import net.minestom.server.event.inventory.InventoryPreClickEvent;
-
 import java.util.Objects;
 import java.util.function.Consumer;
 
 public class InventoryClickListener implements Consumer<InventoryPreClickEvent> {
     @Override
     public void accept(InventoryPreClickEvent inventoryPreClickEvent) {
-        NewPlayer p = (NewPlayer) inventoryPreClickEvent.getPlayer();
+        MuseumPlayer p = (MuseumPlayer) inventoryPreClickEvent.getPlayer();
         WorldManager worldManager = WorldManager.getInstance();
 
         for (World w : worldManager.getWorlds()) {
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ItemUseListener.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ItemUseListener.java
index 171ac76..4754e1d 100755
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ItemUseListener.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/ItemUseListener.java
@@ -1,19 +1,18 @@
 package eu.mhsl.craftattack.worldmuseum.listener;
 
 import eu.mhsl.craftattack.worldmuseum.items.ItemManager;
-import eu.mhsl.craftattack.worldmuseum.util.NewPlayer;
+import eu.mhsl.craftattack.worldmuseum.util.MuseumPlayer;
 import eu.mhsl.craftattack.worldmuseum.worlds.World;
 import net.kyori.adventure.text.Component;
 import net.minestom.server.event.player.PlayerUseItemEvent;
 import net.minestom.server.item.ItemStack;
-
 import java.util.function.Consumer;
 
 public class ItemUseListener implements Consumer<PlayerUseItemEvent> {
 
     @Override
     public void accept(PlayerUseItemEvent playerUseItemEvent) {
-        NewPlayer p = (NewPlayer) playerUseItemEvent.getPlayer();
+        MuseumPlayer p = (MuseumPlayer) playerUseItemEvent.getPlayer();
         ItemStack usedItem = playerUseItemEvent.getItemStack();
 
         if (usedItem.equals(ItemManager.getCompassItem())) compassUse(p);
@@ -21,7 +20,7 @@ public class ItemUseListener implements Consumer<PlayerUseItemEvent> {
 
         playerUseItemEvent.setCancelled(true);
     }
-    private void compassUse(NewPlayer p) {
+    private void compassUse(MuseumPlayer p) {
         if (!p.isAllowCompassUsage()) {
             long lastUsed = (System.currentTimeMillis() - p.getLastCompassUsage()) / 1000;
             p.sendActionBar(Component.text("Du kannst den Kompass erst in " + (15 - lastUsed) + " Sekunden wieder benutzen."));
@@ -30,7 +29,7 @@ public class ItemUseListener implements Consumer<PlayerUseItemEvent> {
         p.openInventory(p.getCompassInventory());
     }
 
-    private void bedUse(NewPlayer player) {
+    private void bedUse(MuseumPlayer player) {
         World world = (World) player.getInstance();
         assert world != null;
         player.teleport(world.getSpawn());
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/MovementListener.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/MovementListener.java
index 60b104c..f6e36b5 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/MovementListener.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/listener/MovementListener.java
@@ -1,14 +1,13 @@
 package eu.mhsl.craftattack.worldmuseum.listener;
 
-import eu.mhsl.craftattack.worldmuseum.util.NewPlayer;
+import eu.mhsl.craftattack.worldmuseum.util.MuseumPlayer;
 import net.minestom.server.event.player.PlayerMoveEvent;
-
 import java.util.function.Consumer;
 
 public class MovementListener implements Consumer<PlayerMoveEvent> {
     @Override
     public void accept(PlayerMoveEvent playerMoveEvent) {
-        NewPlayer player = (NewPlayer) playerMoveEvent.getPlayer();
+        MuseumPlayer player = (MuseumPlayer) playerMoveEvent.getPlayer();
         if (!player.isAllowMovement()) playerMoveEvent.setCancelled(true);
     }
 }
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/skins/SkinCache.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/skins/SkinCache.java
index fc6c84c..1287c20 100755
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/skins/SkinCache.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/skins/SkinCache.java
@@ -5,7 +5,6 @@ import net.minestom.server.entity.Player;
 import net.minestom.server.entity.PlayerSkin;
 import net.minestom.server.timer.ExecutionType;
 import net.minestom.server.timer.TaskSchedule;
-
 import java.util.HashMap;
 import java.util.Map;
 
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/temp/TablistUpdateTask.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/temp/TablistUpdateTask.java
index 7e58210..8aaf620 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/temp/TablistUpdateTask.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/temp/TablistUpdateTask.java
@@ -6,7 +6,6 @@ import net.minestom.server.MinecraftServer;
 import net.minestom.server.adventure.audience.Audiences;
 import net.minestom.server.entity.Player;
 import net.minestom.server.monitoring.TickMonitor;
-
 import java.util.Collection;
 import java.util.concurrent.atomic.AtomicReference;
 
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/util/ChangeWorld.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/util/ChangeWorld.java
index 8bda3a5..48f6c31 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/util/ChangeWorld.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/util/ChangeWorld.java
@@ -4,7 +4,7 @@ import eu.mhsl.craftattack.worldmuseum.worlds.World;
 import net.minestom.server.potion.Potion;
 import net.minestom.server.potion.PotionEffect;
 public class ChangeWorld {
-    public static void changeWorld(NewPlayer player, World targetWorld) {
+    public static void changeWorld(MuseumPlayer player, World targetWorld) {
         player.setAllowMovement(false);
         World world = (World) player.getInstance();
         player.setAllowCompassUsage(false);
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/util/Config.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/util/Config.java
index 0c1330c..82d525e 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/util/Config.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/util/Config.java
@@ -4,12 +4,10 @@ import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
 import eu.mhsl.craftattack.worldmuseum.worlds.World;
 import eu.mhsl.craftattack.worldmuseum.worlds.WorldManager;
-
 import java.io.File;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
-import java.util.Iterator;
 
 public class Config {
     private static Config instance;
@@ -22,9 +20,7 @@ public class Config {
         checkConfig();
         try {
             JsonObject config = (JsonObject) JsonParser.parseReader(new FileReader("config.json"));
-            Iterator iterator =  WorldManager.getInstance().getWorlds().iterator();
-            while (iterator.hasNext()) {
-                World w = (World) iterator.next();
+            for (World w : WorldManager.getInstance().getWorlds()) {
                 if (!w.getName().equals(config.get("start_world").getAsString())) continue;
                 this.start_world = w;
             }
@@ -37,15 +33,16 @@ public class Config {
             e.printStackTrace();
         }
     }
-    private String default_config = "{\n" +
-            "  \"start_world\": \"world\"\n" +
-            "}";
 
     private void checkConfig() {
         try {
             File checkfile = new File("./config.json");
             if (checkfile.createNewFile()) {
                 FileWriter fileWriter = new FileWriter("config.json");
+                String default_config = """
+                        {
+                          "start_world": "world"
+                        }""";
                 fileWriter.write(default_config);
                 fileWriter.close();
             }
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/util/NewPlayer.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/util/MuseumPlayer.java
similarity index 94%
rename from src/main/java/eu/mhsl/craftattack/worldmuseum/util/NewPlayer.java
rename to src/main/java/eu/mhsl/craftattack/worldmuseum/util/MuseumPlayer.java
index d144061..68b6e53 100644
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/util/NewPlayer.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/util/MuseumPlayer.java
@@ -15,13 +15,13 @@ import org.jetbrains.annotations.Nullable;
 import java.time.Duration;
 import java.util.UUID;
 
-public class NewPlayer extends Player {
+public class MuseumPlayer extends Player {
 
     private boolean allowMovement = true;
     private long lastCompassUsage = 0;
     private boolean allowCompassUsage = true;
 
-    public NewPlayer(@NotNull UUID uuid, @NotNull String username, @NotNull PlayerConnection playerConnection) {
+    public MuseumPlayer(@NotNull UUID uuid, @NotNull String username, @NotNull PlayerConnection playerConnection) {
         super(uuid, username, playerConnection);
     }
     public void setSyncCooldown(@Nullable Duration cooldown) {
diff --git a/src/main/java/eu/mhsl/craftattack/worldmuseum/worlds/WorldManager.java b/src/main/java/eu/mhsl/craftattack/worldmuseum/worlds/WorldManager.java
index dc19a87..dc35ee7 100755
--- a/src/main/java/eu/mhsl/craftattack/worldmuseum/worlds/WorldManager.java
+++ b/src/main/java/eu/mhsl/craftattack/worldmuseum/worlds/WorldManager.java
@@ -6,7 +6,7 @@ import java.util.List;
 
 public class WorldManager {
     private static WorldManager instance;
-    private List<World> worlds = new ArrayList<>();
+    private final List<World> worlds = new ArrayList<>();
 
     public static WorldManager getInstance() {
         if (instance == null) {
@@ -23,7 +23,7 @@ public class WorldManager {
             if (w.isEnabled()) {
                 worlds.add(w);
             } else {
-                System.out.println("Es gibt eine nicht aktivierte Welt: " + f.toString());
+                System.out.println("Es gibt eine nicht aktivierte Welt: " + f);
             }
         }
     }
@@ -31,6 +31,7 @@ public class WorldManager {
     private List<File> getFolderNames(File curDir) {
         File[] fileList = curDir.listFiles();
         List<File> returnFolders = new ArrayList<>();
+        assert fileList != null;
         for (File f: fileList) {
             if (f.isDirectory()) returnFolders.add(f);
         }