java.lang.ExceptionInInitializerError: null in minecraft kotlin plugin

Question

I've got problem while I code minecraft plugin with kotlin. Here's error message:

[12:37:07 ERROR]: Error occurred while enabling WorkAndGambling v1.0-SNAPSHOT (Is it up to date?)
java.lang.ExceptionInInitializerError: null
        at io.github.buudd.wag.Main.onEnable(Main.kt:10) ~[WorkAndGambling.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:500) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.craftbukkit.v1_17_R1.CraftServer.enablePlugin(CraftServer.java:561) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.craftbukkit.v1_17_R1.CraftServer.enablePlugins(CraftServer.java:475) ~[patched_1.17.1.jar:git-Paper-352]
        at net.minecraft.server.MinecraftServer.loadWorld(MinecraftServer.java:730) ~[patched_1.17.1.jar:git-Paper-352]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:317) ~[patched_1.17.1.jar:git-Paper-352]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1217) ~[patched_1.17.1.jar:git-Paper-352]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[patched_1.17.1.jar:git-Paper-352]
        at java.lang.Thread.run(Thread.java:831) ~[?:?]
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:229) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:53) ~[patched_1.17.1.jar:git-Paper-352]
        at io.github.buudd.wag.Main.<init>(Main.kt:7) ~[WorkAndGambling.jar:?]
        at io.github.buudd.wag.FunctionsKt.<clinit>(functions.kt:12) ~[WorkAndGambling.jar:?]
        ... 11 more
Caused by: java.lang.IllegalStateException: Initial initialization
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:232) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:53) ~[patched_1.17.1.jar:git-Paper-352]
        at io.github.buudd.wag.Main.<init>(Main.kt:7) ~[WorkAndGambling.jar:?]
        at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78) ~[?:?]
        at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
        at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?]
        at java.lang.reflect.ReflectAccess.newInstance(ReflectAccess.java:128) ~[?:?]
        at jdk.internal.reflect.ReflectionFactory.newInstance(ReflectionFactory.java:350) ~[?:?]
        at java.lang.Class.newInstance(Class.java:642) ~[?:?]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:83) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:153) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:414) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:322) ~[patched_1.17.1.jar:git-Paper-352]
        at org.bukkit.craftbukkit.v1_17_R1.CraftServer.loadPlugins(CraftServer.java:419) ~[patched_1.17.1.jar:git-Paper-352]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:287) ~[patched_1.17.1.jar:git-Paper-352]
        ... 3 more

I noticed that error occured at Main.kt, line 10. And that was loadConfig() function. So, I looked Functions.kt:

package io.github.buudd.wag

import org.bukkit.configuration.file.YamlConfiguration
import io.github.buudd.wag.Variables.cfile
import io.github.buudd.wag.Variables.file


fun loadConfig() {
    cfile = YamlConfiguration.loadConfiguration(file)
    try {
        if (!file.exists()) {
            cfile!!.save(file)
        }
        cfile!!.load(file)
    } catch (localException: Exception) {
        localException.printStackTrace()
    }
}

And variables. Variables.kt:

import org.bukkit.configuration.file.YamlConfiguration
import org.bukkit.plugin.java.JavaPlugin
import java.io.*
import java.util.*


object Variables {
    private val plugin: JavaPlugin = Main()
    var moneyMap: MutableMap<UUID?, Int?> = mutableMapOf(null to null)
    var joinMap: MutableMap<UUID?, Int?> = mutableMapOf(null to null)
    val file: File = File("plugins/WorkAndGambling/config.yml")
    var cfile: YamlConfiguration? = null
}

Main.kt

package io.github.buudd.wag

import io.github.buudd.wag.commands.WAGcommand
import io.github.buudd.wag.listener.Listeners
import org.bukkit.plugin.java.JavaPlugin

class Main : JavaPlugin() {
    override fun onEnable() {
        logger.info("Enabling...")
        loadConfig()
        getCommand("sell")?.apply {
            setExecutor(WAGcommand(this@Main))
            tabCompleter = WAGcommand(this@Main)
        }
        server.pluginManager.registerEvents(Listeners(), this)
    }

    override fun onDisable() {
        logger.info("Disabling...")
    }
}

But, I cannot find why error occured. Sorry if this code's problem is just my mistake.

What's this for? private val plugin: JavaPlugin = Main()

Joseph Sible-Reinstate Monica
– Joseph Sible-Reinstate Monica

2021-11-02 05:47:35 +00:00
Commented Nov 2, 2021 at 5:47 — Joseph Sible-Reinstate Monica
– Joseph Sible-Reinstate Monica, Commented Nov 2, 2021 at 5:47

Elikill58 · Accepted Answer · 2021-11-02 09:03:43Z

The plugin is already enabled.

This can be caused because :

The same plugin is already on the server, but with another JAR name

To fix it, just remove the old jar.

Another plugin use the same name

To fix it, go in plugin.yml and change name variable.

You creating a new instance of this plugin, and JavaPlugin interface creating a new one. This is caused in Variables class. How to fix it ?

You should set the instance as static, go transfer it in method parameter/constructor.

Example of "instance as static" :

companion object {
   lateinit var plugin: Main
}

override fun onEnable() {
   plugin = this;
}

Source of static way

Example of "Transfer in param/constructor" :

It depend of how you are using this variable. You seems to already do it for the class WAGcommand.

PS: I'm a Java spigot developer, so maybe there is issue in kotlin code.

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