NullPointerExecption on .set()

Hey guys,

I'm trying to make it were when a player joins the server, if they are not in the config, it add them in a string. Whenever I try to do the .set() method though, I will get a null pointer exception.

My class:

Code:java

package me.zach.minigames.assassin.main;
 
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
 
public class MakePlayerConfig implements Listener{
 
    Enable enable;
 
    @EventHandler
    public void PlayerAddConfig(PlayerJoinEvent e){
        Player p = e.getPlayer();
        try{
        enable.getConfig().get("Players.ranks." + p.getDisplayName() + ".games");
        }catch (Exception ecpt){
            enable.getConfig().set("Players.ranks." + p.getDisplayName() + ".ingame", true);
            enable.getConfig().set("Players.ranks." + p.getDisplayName() + ".arena", 0);
            enable.getConfig().set("Players.ranks." + p.getDisplayName() + ".games", false);
            enable.getConfig().set("Players.ranks." + p.getDisplayName() + ".doublejump", false);
            enable.loadConfiguration();
        }
 
    }
 
}
 

Stacktrace:

Code:

[18:50:49 ERROR]: Could not pass event PlayerJoinEvent to Assassin vBeta1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:294) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:486) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.PlayerList.c(PlayerList.java:225) [craft
bukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.PlayerList.a(PlayerList.java:116) [craft
bukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.LoginListener.c(LoginListener.java:78) [
craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.LoginListener.a(LoginListener.java:42) [
craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:149
) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craf
tbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
55) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
Caused by: java.lang.NullPointerException
        at me.zach.minigames.assassin.main.MakePlayerConfig.PlayerAddConfig(Make
PlayerConfig.java:18) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_09]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_09]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_09]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_09]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
        ... 14 more

 

legostarwarszach
enable field not assigned to non-null value.

 

xTrollxDudex
What do you mean?

 

legostarwarszach
Assign your enable field to something...

 

xTrollxDudex
I did, didn't I?

Code:java

Enable enable;

 

legostarwarszach
That's a field deceleration, assign is to give the declaration a value using the equals ( = ) sign. Like you do with int ( int i = 0; ), but you need an instance value for Enable to assign it.

 

legostarwarszach I think it's time for you to start learning some Java.

 

xTrollxDudex
I just decided to move it to the main class. Now it works. I tried what you said before.

So in other classes, I do:

Code:java

Enable enable = new Enable();

When I do this though, I get the following stack-trace:

Code:

[09:08:15 ERROR]: Error occurred while enabling Assassin vBeta1.0 (Is it up to d
ate?)
java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader
.java:98) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:59) ~[craftb
ukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at me.zach.minigames.assassin.main.Enable.<init>(Enable.java:15) ~[?:?]
        at me.zach.minigames.assassin.command.Activate.<init>(Activate.java:11)
~[?:?]
        at me.zach.minigames.assassin.command.CommandMain.<init>(CommandMain.jav
a:17) ~[?:?]
        at me.zach.minigames.assassin.main.Enable.onEnable(Enable.java:24) ~[?:?
]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:250) ~[c
raftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:350) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:389) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugin(CraftServer.jav
a:439) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.enablePlugins(CraftServer.
java:375) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.reload(CraftServer.java:77
3) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.Bukkit.reload(Bukkit.java:279) [craftbukkit.jar:git-Bukkit
-1.7.2-R0.3-b3020jnks]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:17
5) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServe
r.java:683) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchServerCommand(Craf
tServer.java:670) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.aw(DedicatedServer.java:
286) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
51) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
Caused by: java.lang.IllegalStateException: Initial initialization
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader
.java:101) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:59) ~[craftb
ukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at me.zach.minigames.assassin.main.Enable.<init>(Enable.java:15) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
~[?:1.7.0_09]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
~[?:1.7.0_09]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce) ~[?:1.7.0_09]
        at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.7.0_0
9]
        at java.lang.Class.newInstance0(Unknown Source) ~[?:1.7.0_09]
        at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_09]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:52) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:133) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:313) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:236) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.ja
va:350) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.reload(CraftServer.java:77
1) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        ... 10 more

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