Error on "new BlockListener (this);"

Hello Bukkit community,

I have reviewed this code for hours now. There are no errors in the code which Eclipse spots and the code appears the same as in the tutorial I watched (learning plugin development right now). Every time I load the server, I am presented with this error:

Console error report (open) Console error report (close)

It first states there is an error on line 19, which you can see is the code which runs the other class.

Class 1 (open) Class 1 (close)

Named AntiBlock

Code:

package me.Wind1000100;

import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.permissions.Permission;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

public class AntiBlock extends JavaPlugin {
 
    public Permission playerPermission = new Permission("playerAbilities.allowed");

    @Override
    public void onEnable() {
        getLogger().info("AntiBlock loaded!");
        new BlockListener (this);
        PluginManager pm = getServer().getPluginManager();
        pm.addPermission(playerPermission);
    }
 
    @Override
    public void onDisable() {
     
    }
 
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (cmd.getName().equalsIgnoreCase("givemeitems") && sender instanceof Player) {
            Player player = (Player) sender;
         
            if (player.hasPermission("playerAbilities.allowed")) {
                player.setItemInHand(new ItemStack(Material.DIAMOND_AXE));
            }else{
                player.sendMessage("§4You don't have permission for this command.");
            }
         
            return true;
        }
        return false;
    }

}

Class 2 (open) Class 2 (close)

Named BlockListener

Code:

package me.Wind1000100;

import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockPlaceEvent;

public class BlockListener implements Listener {

    public BlockListener(AntiBlock plugin) {
        plugin.getServer().getPluginManager().registerEvents(this, plugin);
    }
 
    @EventHandler
    public void onBlockPlace(BlockPlaceEvent e) {
        Player player = e.getPlayer();
     
        if (e.getBlock().getType() == Material.BEDROCK) {
            if (!player.hasPermission("playerAbilities.allowed")) {
                player.sendMessage("§cYou cannot place " + e.getBlock().getType().toString() + ".");
                e.setCancelled(true);
            }else{
                player.sendMessage("§aYou can place " + e.getBlock().getType().toString() + ".");
            }
        }
     
        if (e.getBlock().getType() == Material.GLOWSTONE) {
            Location location = e.getBlock().getLocation();
         
            if (new Location(location.getWorld(), location.getX(), location.getY() - 1, location.getZ()).getBlock().getType() == Material.GRASS) {             
                e.setCancelled(true);
                player.sendMessage("§cYou cannot place glowstone on grass.");
            }else{
                // Do nothing.
            }
        }

    }
 
}

Plugin.yml (open) Plugin.yml (close)

name: AntiBlock
main: me.Wind1000100.AntiBlock
version: 1.0
commands:
givemeitems:
description: Gives player a diamond axe.
usage: /givemeitems

No errors appear in Eclipse or during exporting.

It's probably something really simple, but I've looked through it many times - note the AntiBlock class still runs correctly for the most part, as the /givemeitems command work; it just doesn't run BlockListener.

 

A) Change your package name a bit. Should be all lowercase, and add a unique identifier to that plugin (such as the project name)
B) Don't use the § symbol, instead use the ChatColor enum
C) Useless onDisable, you can remove it
D) onCommand can be overridden
E) What will you do if the sender isn't a player? You checked, but you didn't handle it
F) Returning false says that the command was not handled, and will return the usage from the plugin.yml
G) I would change how you are registering your events. If you are using methods or fields from your main class, add a constructor like this:

Code:

private AntiBlock plugin;

public BlockListener(AntiBlock plugin) {
    this.plugin = plugin;
}

Otherwise, you don't need a constructor. Instead, just register your event in your main class's onEnable:

Code:

Bukkit.getServer().getPluginManager().registerEvents(new BlockListener(), this);
// If you are using a constructor, change new BlockListener() to new BlockListener(this)

 

@Wind1000100

It looks like you're not JARing the file correctly. That's certainly an odd error.

 

Thanks, I'll see if I can fix the issue using the code you provided.
Also, why is a section sign not recommended for colour codes? It works fine for all my other testing plugins, and is much quicker. ChatColor.<colour> also works, but I'm not sure why it is best.

 

@Wind1000100 It's just safer and more stable. If the color codes were ever to change, all of your plugins would have messed up colors.