feat(wrapper): trying to debug the issue

src/main/java/xyz/ineanto/nicko/Nicko.java

@@ -1,9 +1,19 @@
 package xyz.ineanto.nicko;
 
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.utility.MinecraftVersion;
+import com.comphenix.protocol.wrappers.MinecraftKey;
+import net.kyori.adventure.text.Component;
 import org.bstats.bukkit.Metrics;
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
+import org.bukkit.World;
 import org.bukkit.command.PluginCommand;
 import org.bukkit.plugin.java.JavaPlugin;
 import xyz.ineanto.nicko.appearance.random.RandomNameFetcher;
@@ -132,6 +142,32 @@ public class Nicko extends JavaPlugin {
             getServer().getPluginManager().registerEvents(new PlayerJoinListener(), this);
             getServer().getPluginManager().registerEvents(new PlayerQuitListener(), this);
             metrics = new Metrics(this, 20483);
+
+            ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(this,
+                    ListenerPriority.HIGH,
+                    PacketType.Play.Server.RESPAWN
+            ) {
+                @Override
+                public void onPacketSending(PacketEvent event) {
+                    try {
+                        Bukkit.broadcast(Component.text("intercepting packet..."));
+                        Class<?> commonPlayerInfoClazz = MinecraftReflection.getMinecraftClass("network.protocol.game.CommonPlayerSpawnInfo");
+                        // access CommonPlayerSpawnInfo, first field of that type in the Respawn / Login packets
+                        Object commonSpawnData = Accessors.getFieldAccessor(event.getPacket().getClass(), commonPlayerInfoClazz, true).getField().get(event.getPacket());
+                        // get the key of the level the player is joining. Second field in the object. First of type ResourceKey
+                        MinecraftKey key = MinecraftKey.fromHandle(Accessors.getFieldAccessor(commonPlayerInfoClazz, MinecraftReflection.getResourceKey(), true).get(commonSpawnData)); // wrap to ProtocolLib handle
+                        for (World world : Bukkit.getWorlds()) {
+                            if (key.getPrefix().equals(world.getKey().getNamespace()) && key.getKey().equals(world.getKey().getKey())) {
+                                Bukkit.broadcast(Component.text("found world!"));
+                            } else {
+                                Bukkit.broadcast(Component.text("whoops, no matching world found"));
+                            }
+                        }
+                    } catch (IllegalAccessException exception) {
+                        throw new RuntimeException(exception);
+                    }
+                }
+            });
         }
 
         getLogger().info("Nicko has been enabled.");

src/main/java/xyz/ineanto/nicko/appearance/AppearanceManager.java

@@ -146,12 +146,12 @@ public class AppearanceManager {
         final boolean wasAllowedToFly = player.getAllowFlight();
         final int foodLevel = player.getFoodLevel();
         final WrapperPlayServerRespawn respawn = new WrapperPlayServerRespawn();
-        respawn.setDimension(world);
+        //respawn.setDimension(world);
         respawn.setSeed(world.getSeed());
         respawn.setGameMode(player.getGameMode());
         respawn.setPreviousGameMode(player.getGameMode());
         respawn.setCopyMetadata(true);
-        respawn.sendPacket(player);
+        //respawn.sendPacket(player);
         player.teleport(player.getLocation(), PlayerTeleportEvent.TeleportCause.PLUGIN);
         player.setAllowFlight(wasAllowedToFly);
         player.setFlying(wasFlying);

src/main/java/xyz/ineanto/nicko/wrapper/WrapperPlayServerRespawn.java

@@ -4,6 +4,8 @@ import com.comphenix.protocol.PacketType;
 import com.comphenix.protocol.events.InternalStructure;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.utility.MinecraftVersion;
 import com.comphenix.protocol.wrappers.EnumWrappers;
 import com.comphenix.protocol.wrappers.MinecraftKey;
@@ -52,8 +54,10 @@ public class WrapperPlayServerRespawn extends AbstractPacket {
             // 1.20.5 to 1.21.1
 
             // why is life so hard?
-            /**final Class<?> commonPlayerInfoClazz = MinecraftReflection.getMinecraftClass("network.protocol.game.CommonPlayerSpawnInfo");
+            final Class<?> commonPlayerInfoClazz = MinecraftReflection.getMinecraftClass("network.protocol.game.CommonPlayerSpawnInfo");
-            Object commonSpawnData = Accessors.getFieldAccessor(TYPE.getPacketClass(), commonPlayerInfoClazz, true).getField().get(TYPE.getPacketClass());
+            try {
+                final Object commonSpawnData = Accessors.getFieldAccessor(TYPE.getPacketClass(), commonPlayerInfoClazz, true).getField()
+                        .get(this);
                 final MinecraftKey key = MinecraftKey.fromHandle(
                         Accessors.getFieldAccessor(
                                         commonPlayerInfoClazz,
@@ -62,13 +66,15 @@ public class WrapperPlayServerRespawn extends AbstractPacket {
                                 )
                                 .get(spawnInfoStructure));
 
-             // Set the key
                 Accessors.getFieldAccessor(
                                 commonPlayerInfoClazz,
                                 MinecraftReflection.getResourceKey(),
                                 true
                         )
-             .set(commonSpawnData, key);*/
+                        .set(commonSpawnData, key);
+            } catch (IllegalAccessException e) {
+                throw new RuntimeException(e);
+            }
         }
     }