Solved Error when using Economy

Hi, I'm making a plugin and there is one part which deducts money from a player's account. But when I use the withdrawPlayer or getBalance function, the plugin doesn't work and just throws an error.

Here is the main class:

Code:

package yjjcity.plugins.Cashiers;

import org.bukkit.Bukkit;
import org.bukkit.plugin.RegisteredServiceProvider;
import org.bukkit.plugin.java.JavaPlugin;
import net.milkbowl.vault.economy.Economy;
import net.milkbowl.vault.economy.Economy;

import net.md_5.bungee.api.ChatColor;
import yjjcity.plugins.Cashiers.Events.EventsClass;

public class Cashiers extends JavaPlugin {
   
    @Override
    public void onEnable() {
        setupEconomy();
        getServer().getConsoleSender().sendMessage(ChatColor.YELLOW+"\n\nYJJ City Plugins - Cashiers"+ChatColor.GREEN+" has been ENABLED.\n\n");
        getServer().getPluginManager().registerEvents(new EventsClass(), this);
    }
   
    public static Economy economy = null;
    
    private boolean setupEconomy(){

        RegisteredServiceProvider<Economy> economyProvider = getServer().getServicesManager().getRegistration(net.milkbowl.vault.economy.Economy.class);

        if(economyProvider != null){
            economy = economyProvider.getProvider();
        }

        return (economy != null);

    }
   
    @Override
    public void onDisable() {
        getServer().getConsoleSender().sendMessage(ChatColor.YELLOW+"\n\nYJJ City Plugins - Cashiers"+ChatColor.RED+" has been DISABLED.\n\n");
    }
}

Here is the part of the Events class code which involves the Economy:

Code:

else if (line3.equalsIgnoreCase("Click to Pay")) {
                        double amount = Double.parseDouble(line2.substring(3));
                        player.sendMessage(ChatColor.GREEN+"Amount: YC$"+amount);
                        player.sendMessage(ChatColor.GREEN+"You have YC$"+economy.getBalance(player)+" in your account.");
                        EconomyResponse r = economy.withdrawPlayer(player, amount);
                        player.sendMessage(ChatColor.GREEN+"Deducted YC$"+amount+" from your account.");
                        if (r.transactionSuccess()) {
                            player.sendMessage(ChatColor.GREEN+line2+" has been deducted from your account.");
                        } else {
                            player.sendMessage(ChatColor.RED+"An error occured. Do you have enough money in your account?");

And here is the error that pops up in the console:

Code:

[15:36:50 ERROR]: Could not pass event PlayerInteractEvent to YJJCityPlugins-Cashiers v1.0

java.lang.NullPointerException: null
        at yjjcity.plugins.Cashiers.Events.EventsClass.onInteract(EventsClass.java:97) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor333.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.15.2.jar:git-Paper-168]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[patched_1.15.2.jar:git-Paper-168]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.15.2.jar:git-Paper-168]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:607) ~[patched_1.15.2.jar:git-Paper-168]
        at org.bukkit.craftbukkit.v1_15_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:463) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.PlayerInteractManager.a(PlayerInteractManager.java:448) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1378) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:27) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:5) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:1053) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1046) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1016) ~[patched_1.15.2.jar:git-Paper-168]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:939) ~[patched_1.15.2.jar:git-Paper-168]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]

 

So I put a

Code:

if (economy == null) {
    setupEconomy();
}

in onEnable()?

 

Ok I copied the Economy setup from the VaultApi repo. But all the examples I see elsewhere show Economy being used in the Main class. How do I "import" it into the Events class?

Below is the main class:

Code:

package yjjcity.plugins.Cashiers;

import java.util.logging.Logger;

import org.bukkit.Bukkit;
import org.bukkit.plugin.RegisteredServiceProvider;
import org.bukkit.plugin.java.JavaPlugin;
import net.milkbowl.vault.chat.Chat;
import net.milkbowl.vault.economy.Economy;
import net.milkbowl.vault.economy.EconomyResponse;

import net.md_5.bungee.api.ChatColor;
import yjjcity.plugins.Cashiers.Events.EventsClass;

public class Cashiers extends JavaPlugin {
    private static final Logger log = Logger.getLogger("Minecraft");
    private static Economy econ = null;
    private static Chat chat = null;
   
    @Override
    public void onEnable() {
        if (!setupEconomy() ) {
            log.severe(String.format("[%s] - Disabled due to no Vault dependency found!", getDescription().getName()));
            getServer().getPluginManager().disablePlugin(this);
            return;
        }
        getServer().getConsoleSender().sendMessage(ChatColor.YELLOW+"\n\nYJJ City Plugins - Cashiers"+ChatColor.GREEN+" has been ENABLED.\n\n");
        getServer().getPluginManager().registerEvents(new EventsClass(), this);
        setupChat();
    }
   
    private boolean setupEconomy() {
        if (getServer().getPluginManager().getPlugin("Vault") == null) {
            return false;
        }
        RegisteredServiceProvider<Economy> rsp = getServer().getServicesManager().getRegistration(Economy.class);
        if (rsp == null) {
            return false;
        }
        econ = rsp.getProvider();
        return econ != null;
    }
   
    private boolean setupChat() {
        RegisteredServiceProvider<Chat> rsp = getServer().getServicesManager().getRegistration(Chat.class);
        chat = rsp.getProvider();
        return chat != null;
    }
   
    @Override
    public void onDisable() {
        getServer().getConsoleSender().sendMessage(ChatColor.YELLOW+"\n\nYJJ City Plugins - Cashiers"+ChatColor.RED+" has been DISABLED.\n\n");
    }
   
    public static Economy getEconomy() {
        return econ;
    }
   
    public static Chat getChat() {
        return chat;
    }
}

 

Sorry, I don't know how to do this. Do you know how?

 

Sorry, I am completely lost. Do I replace private static Economy econ with public static Economy econ? And what should I do after that?

 

Is this what I'm supposed to do?
Here is the main class:

Code:

package yjjcity.plugins.Cashiers;

import java.util.logging.Logger;

import org.bukkit.Bukkit;
import org.bukkit.plugin.RegisteredServiceProvider;
import org.bukkit.plugin.java.JavaPlugin;
import net.milkbowl.vault.chat.Chat;
import net.milkbowl.vault.economy.Economy;
import net.milkbowl.vault.economy.EconomyResponse;

import net.md_5.bungee.api.ChatColor;
import yjjcity.plugins.Cashiers.Events.EventsClass;

public class Cashiers extends JavaPlugin {
    private static final Logger log = Logger.getLogger("Minecraft");
    public static Economy econ = null;
    private static Chat chat = null;
   
    @Override
    public void onEnable() {
        if (!setupEconomy() ) {
            log.severe(String.format("[%s] - Disabled due to no Vault dependency found!", getDescription().getName()));
            getServer().getPluginManager().disablePlugin(this);
            return;
        }
        getServer().getConsoleSender().sendMessage(ChatColor.YELLOW+"\n\nYJJ City Plugins - Cashiers"+ChatColor.GREEN+" has been ENABLED.\n\n");
        getServer().getPluginManager().registerEvents(new EventsClass(), this);
        setupChat();
    }
   
    private boolean setupEconomy() {
        if (getServer().getPluginManager().getPlugin("Vault") == null) {
            return false;
        }
        RegisteredServiceProvider<Economy> rsp = getServer().getServicesManager().getRegistration(Economy.class);
        if (rsp == null) {
            return false;
        }
        econ = rsp.getProvider();
        return econ != null;
    }
   
    private boolean setupChat() {
        RegisteredServiceProvider<Chat> rsp = getServer().getServicesManager().getRegistration(Chat.class);
        chat = rsp.getProvider();
        return chat != null;
    }
   
    @Override
    public void onDisable() {
        getServer().getConsoleSender().sendMessage(ChatColor.YELLOW+"\n\nYJJ City Plugins - Cashiers"+ChatColor.RED+" has been DISABLED.\n\n");
    }
   
    public static Economy getEconomy() {
        return econ;
    }
   
    public static Chat getChat() {
        return chat;
    }
}

And in the Events class I added this

Code:

public class EventsClass implements Listener {
    private static Economy econ = null;
    public static Economy getEcon(){
        return econ;
    }
...
                        EconomyResponse r = econ.withdrawPlayer(player, amount);
                        player.sendMessage(ChatColor.GREEN+"Deducted YC$"+amount+" from your account.");

 

So I want to set the economy in the Events class, so I should remove the

Code:

public static Economy econ = null;

in the Main class? But if so then the Main class would have an error since setupEconomy() uses econ.

 

@YJJcoolcool No create it in your main class, and when you instancie your event class, pass an instance of ur main class in the parameter of the constructor, then in your event class, you will able to access to variable into your mainclass

 

Sorry, I'm a bit confused.
But what I did was removed the getEcon() function in the Events class.
Just to verify, nothing needs to be changed in the Main class as it is right now right?
What do I do in the Event's class?

I put a Economy econ = new Economy in the Events class but it doesn't work.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I put Economy econ = new main.getEcon() in the Events class but it gave an error which said
main cannot be resolved to a type

 

Code:

public class EventsClass implements Listener {
      private Plugin plugin = Cashiers.getPlugin(Cashiers.class);
      @EventHandler
      public void onInteract(PlayerInteractEvent event) {
            Economy econ = new main.getEcon();

Is this a constructor?

 

plugin.getEcon() didn't work but I changed it to Cashiers.getEcon() (name of the main class) and it worked.
Thank you so much for helping, really appreciate your patience!!