Solved NullPointerException while trying to generate a custom config

Hello everyone!

I'm having some problems with creating custom configs. I've tried to search the web for a solution, but unfortunately I couldn't find one.

While using the command /tovercraft status djinn open/close, I'm getting a NullPointerException.

Stacktrace (open) Stacktrace (close)

Code:

[13:26:30 WARN]: Unexpected exception while parsing console command "tovercraft status djinn open"
org.bukkit.command.CommandException: Unhandled exception executing command 'tovercraft' in plugin Tovercraft v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-55589cd]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit.jar:git-Bukkit-55589cd]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:621) ~[craftbukkit.jar:git-Bukkit-55589cd]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchServerCommand(CraftServer.java:607) [craftbukkit.jar:git-Bukkit-55589cd]
        at net.minecraft.server.v1_8_R3.DedicatedServer.aO(DedicatedServer.java:371) [craftbukkit.jar:git-Bukkit-55589cd]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:336) [craftbukkit.jar:git-Bukkit-55589cd]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:628) [craftbukkit.jar:git-Bukkit-55589cd]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:536) [craftbukkit.jar:git-Bukkit-55589cd]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_73]
Caused by: java.lang.NullPointerException
        at tk.nelson2tm.tovercraft.Status.changeStatus(Status.java:23) ~[?:?]
        at tk.nelson2tm.tovercraft.Tovercraft.onCommand(Tovercraft.java:42) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-55589cd]
        ... 8 more

Main class (Tovercraft) (open) Main class (Tovercraft) (close)

Code:

package tk.nelson2tm.tovercraft;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.java.JavaPlugin;

public class Tovercraft extends JavaPlugin  {
  
    public static Plugin plugin;
  
    private Status status = new Status();
  
    public static String prefix = ChatColor.GRAY + "[" + ChatColor.DARK_PURPLE + "Tovercraft" + ChatColor.GRAY + "] " + ChatColor.GRAY;
    public static String statusPrefix = ChatColor.GRAY + "[" + ChatColor.DARK_PURPLE + "Status" + ChatColor.GRAY + "] " + ChatColor.GRAY;
  
    public void onEnable(){
              
        getLogger().info("Enabled!");
      
    }
  
    public void onDisable() {
      
        getLogger().info("Disabled!");
      
    }
  
    public static Plugin getPlugin() {
        return plugin;
    }
  
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
      
        if(cmd.getName().equalsIgnoreCase("tovercraft")) {
          
            if(args.length == 3) {
              
                // /tovercraft status <attractie> <status>
                if(args[0].equalsIgnoreCase("status")) {
                    status.changeStatus(sender, args[1], args[2]);
                }
              
            } else {
                commandNotFound(sender);
            }
          
        }
        return false;
    }
  
    public void commandNotFound(CommandSender sender) {
      
        sender.sendMessage(prefix + "Dit commando is niet gevonden.");
      
    }
  
}

Config class (Status) (open) Config class (Status) (close)

Code:

package tk.nelson2tm.tovercraft;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;

public class Status {
  
    String prefix = Tovercraft.prefix;
    String statusPrefix = Tovercraft.statusPrefix;
  
    File statusConfig = null;
    FileConfiguration statusFileConfig = null;
  
    public void changeStatus(CommandSender sender, String attractie, String status) {
      
        //Lijst van attractie afkortingen
        ArrayList<String> attracties = new ArrayList<String>();
        attracties.add("djinn");
      
        //Lijst van mogelijke statussen
        ArrayList<String> statussen = new ArrayList <String>();
        statussen.add("open");
        statussen.add("sluit");
        statussen.add("onderhoud");
        statussen.add("aanbouw");
      
        //Bestaat de attractie?
        if(attracties.contains(attractie)) {
          
            //Bestaat de status?
            if(statussen.contains(status)){
              
                sender.sendMessage(prefix);
                this.statusConfig = new File(Tovercraft.getPlugin().getDataFolder(), "status.yml");
                this.statusFileConfig = YamlConfiguration.loadConfiguration(statusConfig);
                statusFileConfig.set(attractie, status);
                try {
                    statusFileConfig.save(statusConfig);
                } catch (IOException e) {
                    e.printStackTrace();
                }
              
                if(statussen.contains("open") || statussen.contains("sluit")) {
                statusBroadcast(attractie, status);
              
                }
          
            }
          
        } else {
          
            sender.sendMessage(prefix + "De attractie " + ChatColor.DARK_PURPLE + attractie + ChatColor.GRAY + " is niet gevonden.");
          
        }
      
    }
  
    public void statusBroadcast(String attractie, String status) {
      
        String statusColor = "Error";
        String attractieColor = "Error";
      
        if(status.equals("open")) {
            statusColor = ChatColor.GREEN + "geopend" + ChatColor.GRAY;
        } else if(status.equals("sluit")) {
            statusColor = ChatColor.DARK_RED + "gesloten" + ChatColor.GRAY;
        }
      
        if(attractie.equals("djinn")) {
            attractieColor = ChatColor.GRAY + "De " + ChatColor.DARK_PURPLE + "Djinn" + ChatColor.GRAY;
        }
      
        Bukkit.broadcastMessage(statusPrefix + attractieColor + " is nu " + statusColor + ".");
      
    }
  
}

 

Field "plugin" in main class is never initialized.

 

Thanks! Stupid me didn't think about that.

Simply fixed it by adding the line

Code:

plugin = this;

in the onEnable()