Need help with Vault

I am trying to make it so that when a player does the command /warband horse it withdraws 5000 dollars and spawns a horse. It is giving a null pointer error which I will put in a spoiler along with my class files

Error Log (open) Error Log (close)

[06:41:46] [Server thread/INFO]: RickPow issued server command: /warband horse
[06:41:46] [Server thread/WARN]: java.lang.NullPointerException
[06:41:46] [Server thread/WARN]: at me.RickPow.CommandHorseEgg.onCommand(CommandHorseEgg.java:21)
[06:41:46] [Server thread/WARN]: at me.RickPow.Commands.onCommand(Commands.java:37)
[06:41:46] [Server thread/WARN]: at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[06:41:46] [Server thread/WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140)
[06:41:46] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:619)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1093)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:953)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:37)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:9)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)
[06:41:46] [Server thread/WARN]: at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[06:41:46] [Server thread/WARN]: at java.util.concurrent.FutureTask.run(Unknown Source)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:672)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:628)
[06:41:46] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:536)
[06:41:46] [Server thread/WARN]: at java.lang.Thread.run(Unknown Source)

Commands class which my commands extend:

Code:

public class Commands implements CommandExecutor {
   
    public static List<Commands> commands = Collections.synchronizedList(new ArrayList<Commands>());

    protected Plugin plug = Main.instance();

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
        if (args.length == 0)
        {
            sender.sendMessage(ChatColor.RED + "Wrong command usage! Do " + ChatColor.AQUA + "<cmd>");
            return true;
        
        }
       
        boolean didCommand = false;
       
        if (commands.size() == 0)
        {
            registerCommands();
        }
       
        try {
            for (int i = 0;i < commands.size();i++)
            {
                if (commands.get(i).onCommand(sender, cmd, label, args) == true)
                {
                    didCommand = true;
                }
            }
        } catch (Exception ex)
        {
            sender.sendMessage(ChatColor.RED + "Exception occured! Report to a developer. " + ChatColor.RED +
                    ex.getClass().getSimpleName());
            ex.printStackTrace();
            return true;
        }
       
        if (didCommand == false)
        {
            sender.sendMessage(ChatColor.RED + "No such command! Try /<cmd>");
        }
        return true;
    }
   
    public static void registerCommands()
    {
        commands.add(new CommandSpawnGolem());
        commands.add(new CommandSpawnWolf());
        commands.add(new CommandHorseEgg());
        //commands.add(new <class which extends Commands name>());
    }



}

My Main Class:

Code:

public class Main extends JavaPlugin {
   
    public static Economy economy;
   
   
    public void onEnable() {
        Commands.registerCommands();
        getCommand("warband").setExecutor(new Commands());
       
       
          RegisteredServiceProvider<Economy> service = Bukkit.getServicesManager().getRegistration(net.milkbowl.vault.economy.Economy.class);
         if(service != null)
                economy = service.getProvider();
    }
   
    public void onDisable() {
       
       
    }
   
      private boolean setupEconomy() {
            if (getServer().getPluginManager().getPlugin("Vault") == null) {
                return false;
            }
            RegisteredServiceProvider<Economy> rsp = getServer().getServicesManager().getRegistration(Economy.class);
            if (rsp == null) {
                return false;
            }
            economy = rsp.getProvider();
            return economy != null;
        }

    public static Plugin instance() {
        // TODO Auto-generated method stub
        return null;
    }
}

My Horse Egg command:

Code:

public class CommandHorseEgg extends Commands{
    public static Economy economy;

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label,
            String[] args) {
        Player p = (Player) sender;
        int horseCost = 5000;
        double currentBal = economy.getBalance(p);
        if(p.hasPermission("warband.horse")) {
        if(args[0].equalsIgnoreCase("horse")) {
           
            if(currentBal >= horseCost) {
            EconomyResponse r = economy.withdrawPlayer(p, horseCost); //fix tomorrow
            if(r.transactionSuccess()) {
            p.sendMessage(ChatColor.BLUE + "$5000 withdrawn! You have");
            p.sendMessage(ChatColor.GREEN + "Enjoy your new horse!");
            p.getLocation().getWorld().spawnEntity(p.getLocation(), EntityType.HORSE);
        }
        }
        }
    }
        return true;

    }
}

 

Read this: http://bukkit.org/threads/how-to-re...ubleshoot-your-own-plugins-by-yourself.32457/

 

@Rick221

[06:41:46] [Server thread/WARN]: java.lang.NullPointerException

A Null Pointer Exception in Java is an error which occurs if you try to do something with an object which that is 'null'. when you try to call a method on null or try to access a variable on null you will get this null pointer exception.

[06:41:46] [Server thread/WARN]: at me.RickPow.CommandHorseEgg.onCommand(CommandHorseEgg.java:21)

There is something going wrong on line 21 of your code.

 

And to add to what these two have said:
If you want any help with something like this, you need to post your entire class, not just cutouts!

 

Those are my whole classes, know what your talking about before you sound like an idiot.

 

Such ignorance

Where are your imports? Where are your package declarations?

 

Lol, this guy! :')
@Scimiguy is right you know!

Small piece of live advice: Don't call people idiots when they are trying to help, that's an attitude that won't get you far in life