Need Serious Help, at Dead End

Hello all,

This plugin is used to spawn an aesthetic LeashHitch (no leashed entity), the LeashHitch in most cases will despawn on chunk reload (unload then load). When placing a "Tiki Torch" the initial LeashHitch UUID & Location are stored to a HashMap. On the event ChunkLoadEvent the map is iterated through to spawn the LeashHitch, remove the existing data and add the new data.

Code:

[SEVERE] Could not pass event ChunkLoadEvent to Tiki_Torches v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at net.minecraft.server.v1_6_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:138)
    at net.minecraft.server.v1_6_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:84)
    at net.minecraft.server.v1_6_R3.PlayerList.a(PlayerList.java:173)
    at net.minecraft.server.v1_6_R3.PlayerList.c(PlayerList.java:222)
    at net.minecraft.server.v1_6_R3.PlayerList.a(PlayerList.java:103)
    at net.minecraft.server.v1_6_R3.PendingConnection.e(PendingConnection.java:132)
    at net.minecraft.server.v1_6_R3.PendingConnection.d(PendingConnection.java:43)
    at net.minecraft.server.v1_6_R3.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:41)
    at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:29)
    at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
    at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
    at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
    at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
    at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.IllegalArgumentException: Cannot spawn an entity for org.bukkit.entity.LeashHitch
    at org.bukkit.craftbukkit.v1_6_R3.CraftWorld.spawn(CraftWorld.java:1026)
    at org.bukkit.craftbukkit.v1_6_R3.CraftWorld.spawn(CraftWorld.java:791)
    at me.version3ptO.Tiki_Torches.Main.onChunkLoad(Main.java:218)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 17 more

Code:

Code:java

package me.version3ptO.Tiki_Torches;
 
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.logging.Logger;
 
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Chunk;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Entity;
import org.bukkit.entity.LeashHitch;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.hanging.HangingBreakEvent;
import org.bukkit.event.player.PlayerInteractEntityEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.world.ChunkLoadEvent;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
 
public class Main extends JavaPlugin
    implements Listener
{
    public static Main plugin;
    public static Logger log = Logger.getLogger("Minecraft");
 
    public String indent;
    public String indentDbl;
    public String labelError;
 
    public Set<String> toggle = new HashSet<>();
    public Map<UUID, Location> entLoc = new HashMap<>();
 
    @Override
    public void onDisable()
    {
        this.saveConfig();
        PluginDescriptionFile pd = this.getDescription();
        getLogger().info("Disabled v" + pd.getVersion());
    }
 
    @Override
    public void onEnable()
    {
        PluginDescriptionFile pd = this.getDescription();
        getLogger().info("Enabled v" + pd.getVersion());
        PluginManager pm = Bukkit.getPluginManager();
        pm.registerEvents(this, this);
        this.saveDefaultConfig();
 
        indent = " ";
        indentDbl = "  ";
        labelError = ChatColor.DARK_RED + " Error: " + ChatColor.RESET;
    }
 
    public void saveMap(Map<UUID, Location> entLoc)
    {
        List<String> list = new ArrayList<String>();
 
        for (Map.Entry<UUID, Location> entry : entLoc.entrySet()) {
            Location loc = entry.getValue();
            String string = loc.getWorld()
                    + "," + loc.getBlockX()
                    + "," + loc.getBlockY()
                    + "," + loc.getBlockZ();
 
            list.add(entry.getKey().toString() + ":" + string);
        }
        this.getConfig().set("entLoc", list);
    }
 
    public void loadMap(Map<UUID, Location> entLoc)
    {
        List<String> list = getConfig().getStringList("entLoc");
 
        for (String string : list) {
            String one = string.split(":")[0];
            String two = string.split(":")[1];
            Location loc = new Location(
                    Bukkit.getWorld(two.split(",")[0]),
                    Integer.parseInt(two.split(",")[1]),
                    Integer.parseInt(two.split(",")[2]),
                    Integer.parseInt(two.split(",")[3]));
 
            entLoc.put(UUID.fromString(one), loc);
        }
    }
 
    // Toggle tiki torch mode.
    public boolean onCommand(CommandSender sender, Command cmd, String command, String args[])
    {
        if (sender instanceof Player) {
            Player player = (Player) sender;
            String name = player.getName();
 
            if (command.equalsIgnoreCase("tt")
                    && player.hasPermission("tt.create")) {
                if (args.length == 0) {
                    if (!toggle.contains(name)) {
                        toggle.add(name);
                        player.sendMessage(indent + ChatColor.GREEN + "Tiki Torch mode enabled.");
                    } else {
                        toggle.remove(name);
                        player.sendMessage(indent + ChatColor.RED + "Tiki Torch mode disabled.");
                    }
                } else {
                    player.sendMessage(labelError + ChatColor.RED + "Too many arugments.");
                }
            } if (!player.hasPermission("tt.create")) {
                player.sendMessage(labelError + ChatColor.RED + "You can't do that.");
            }
        }
        return false;
    }
 
    @EventHandler
    // Tiki torch creation and location registration.
    public void onInteract(PlayerInteractEvent event)
    {
        Player player = event.getPlayer();
        Block block = event.getClickedBlock();
        Action action = event.getAction();
        String name = player.getName();
        Material item = player.getItemInHand().getType();
 
        if (toggle.contains(name)
                && item == Material.TORCH
                && action == Action.RIGHT_CLICK_BLOCK
                && player.hasPermission("tt.create")) {
            World world = player.getWorld();
 
            for (int i = 1; i <= 3; i++) {
                block.getRelative(BlockFace.UP, i).setType(Material.FENCE);
            }
            Location hitchLoc = block.getLocation().add(0, 3, 0);
            LeashHitch hitch = world.spawn(hitchLoc, LeashHitch.class);
 
            entLoc.put(hitch.getUniqueId(), hitchLoc);
 
            this.saveMap(entLoc); // Save data
 
            block.getRelative(BlockFace.UP, 4).setType(Material.TORCH);;
        }
    }
 
    @EventHandler
    public void onEntityInteract(PlayerInteractEntityEvent event)
    {
        Player player = event.getPlayer();
        Entity entity = event.getRightClicked();
        UUID uuid = entity.getUniqueId();
        String name = player.getName();
        Material item = player.getItemInHand().getType();
 
        // Unregistering hitch:
        if (toggle.contains(name)
                && item == Material.TORCH
                && entity instanceof LeashHitch
                && entLoc.containsKey(uuid)
                && player.hasPermission("tt.remove")) {
            entLoc.remove(uuid);
            player.sendMessage(indent + ChatColor.YELLOW + "Data removed. Removing Hitch...");
 
            entity.remove();
        } if (entity instanceof LeashHitch
                && entLoc.containsKey(uuid)) {
            event.setCancelled(true);
            player.sendMessage(labelError + ChatColor.RED + "You can't do that.");
        }
    }
 
    @EventHandler
    // Hitch OR hitched post is broken:
    public void onHangingBreak(HangingBreakEvent event)
    {
        Entity entity = event.getEntity();
        UUID uuid = entity.getUniqueId();
 
        if (entLoc.containsKey(uuid)) {
            entLoc.remove(uuid);
            System.out.println("Data removed (onBreak)");
        }
    }
 
    @EventHandler
    public void onChunkLoad(ChunkLoadEvent event)
    {
        Chunk chunk = event.getChunk();
        World world = event.getWorld();
        Map<UUID, Location> tempLoc = new HashMap<>();
 
        this.loadMap(entLoc); // Load data
 
        // Iterate through stored entity data.
        for (Iterator<Map.Entry<UUID, Location>> iterator = entLoc.entrySet().iterator();
                iterator.hasNext();) {
            Map.Entry<UUID, Location> entry = iterator.next();
 
            // Is chunk with stored entity equal to current chunk?
            // Spawn entity, add new data to temporary map and remove existing data.
            if (world.getChunkAt(entry.getValue()).equals(chunk)) {
                Location hitchLoc = entry.getValue();
                LeashHitch hitch = world.spawn(hitchLoc, LeashHitch.class);
 
                tempLoc.put(hitch.getUniqueId(), hitchLoc);
 
                iterator.remove();
            }
        } if (tempLoc != null) {
            entLoc.putAll(tempLoc);
 
            this.saveMap(entLoc); // Save data
        }
    }
}

Thanks

 

Well, the problem is literally in the error. You can't spawn a LeashHitch. It might be possible with NMS, but you can't with just Bukkit.

 

molenzwiebel The plugin has already spawned a LeashHitch once, I'm trying to spawn it again.

 

Code:

Caused by: java.lang.IllegalArgumentException: Cannot spawn an entity for org.bukkit.entity.LeashHitch

Seems pretty clear to me...

 

molenzwiebel The plugin has already spawned a LeashHitch once at line 152 no problem.

 

Well, there is no difference between

Code:

LeashHitch hitch = world.spawn(hitchLoc, LeashHitch.class);

and

Code:

LeashHitch hitch = world.spawn(hitchLoc, LeashHitch.class);

This means either Bukkit is derping, or the spawning on line 152 isn't successful either.

 

molenzwiebel As I have said twice, it has spawned at line 152 and therefore Bukkit is derping.

 

Alright, you are right. You can spawn the leash. Looking at craftbukkit's code, it seems that the leash object in spawn() is null, which then throws the exception. It might have to do with the chunk not being loaded yet

 

molenzwiebel A fellow on bukkitdev pointed out this thread to me, I can't make sense of it however.