Create config on player join event

I just started getting into Bukkit coding about a week or so ago and right now I'm just playing with code to get a better understanding of it before I decide to try and code anything serious

I'd like some help with creating a class related to player join events that will create a "UUID".yml file for playerdata

Code for player join event class:

Code:java

import org.bukkit.ChatColor;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
 
import me.Mortem420.PracticePlugin.configManager;
import me.Mortem420.PracticePlugin.myConfig;
 
public class PlayerJoin_Event implements Listener
 
{
 
    public configManager manager;
 
    public myConfig playerDataTwo;
 
    @EventHandler
    public void onJoin(PlayerJoinEvent joinEvent)
    {  
        Player thePlayer = joinEvent.getPlayer();
        joinEvent.setJoinMessage(ChatColor.GOLD + "Hello " + thePlayer.getName() + ". Welcome to: " + thePlayer.getWorld().getName() + ". It is " + thePlayer.getWorld().getTime());  
 
//  String playerUUID = thePlayer.getUniqueId().toString();
//        if(!playerDataTwo.contains(playerUUID));
//        {
//            playerDataTwo = manager.getNewConfig("playerData/" + thePlayer.getName() + ".yml", new String[] {thePlayer.getName(), "This is the playerData file", "UUID: " + playerUUID});
 
 
//            playerDataTwo.set("Homes." + thePlayer.getName(), thePlayer.getLocation());
//            playerDataTwo.saveConfig();
//        }
    }
}
 

The lines that are commented out should be atleast close to checking for and making the .yml file, I just don't fully know where or how to properly use it. I know for sure that the event is registered properly because I get the message when I join the server

Any help would be much appreciated as I've really been enjoying learning Java and hope to be able to code my own plugins

 

manager and playerDataTwo are constructed in other class files that I have for managing config files. the problem I'm having with the commented lines is that when I join my server I get a console error referring to the line with
if(!playerDataTwo.contains(playerUUID));

I just have them commented for right now so its still there when i can figure out how to fix it

 

Heres the full console error:

[05:03:10] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to PracticePlugin v0.0.14e
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.PlayerList.onPlayerJoin(PlayerList.java:346) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.PlayerList.a(PlayerList.java:166) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.LoginListener.b(LoginListener.java:159) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.LoginListener.e(LoginListener.java:57) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.NetworkManager.a(NetworkManager.java:233) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.ServerConnection.c(ServerConnection.java:140) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:845) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot.jar:git-Spigot-dcd1643-e60fc34]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
Caused by: java.lang.NullPointerException
at me.Mortem420.PracticePlugin.Events.PlayerJoin_Event.onJoin(PlayerJoin_Event.java:28) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_221]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_221]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_221]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_221]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-dcd1643-e60fc34]
... 14 more

 

line 28 is if(!playerDataTwo.contains(playerUUID));

 

yeah, I had a feeling. I think its just that line I'm having trouble with. I could have even typed it entirely wrong, i'm not sure. any advice for what i could do to fix it??

 

hmm... well that's the idea but I'm unsure of how to get it to work. I have similar code working elsewhere in the plugin but there I have it set to check for and/or create the file after doing a command in-game. maybe its the way i'm going about the file detection??

 

oh ok, well I'm still learning so to some degree don't quite know what I'm doing

 

well i guess its back to google and youtube videos for now until i understand things a bit better i guess. dont wanna be starting anymore threads for stupid, noobish questions. I feel this is a simple problem and with more knowledge I could probably figure it out at some point

ah, i see. ill try to get that figured out then

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