Solved Error occurred while enabling

Hi, i get this problem. How i can fix it?

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Error occurred while enabling KitPVP v0.1 (Is it up to date?)
java.lang.IllegalArgumentException: Plugin already initialized!
at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:183) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:60) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at kpvp.main.KitPVP.<init>(KitPVP.java:10) ~[?:?]
at kpvp.main.Handler.<init>(Handler.java:15) ~[?:?]
at kpvp.main.KitPVP.onEnable(KitPVP.java:44) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:381) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:330) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:422) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:383) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:338) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:272) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:545) [craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.IllegalStateException: Initial initialization
at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:186) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:60) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at kpvp.main.KitPVP.<init>(KitPVP.java:10) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_191]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_191]
at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_191]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:90) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:327) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:305) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:205) ~[craftbukkit-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
... 2 more
[14:14:59] [Server thread/INFO]: Server permissions file permissions.yml is empty, ignoring it
[14:14:59] [Server thread/INFO]: Done (7,136s)! For help, type "help" or "?"

 

Hey,
could you please post your Main class?

 

Code:

package kpvp.main;

import java.io.File;
import java.sql.*;
import java.util.logging.Logger;

import org.bukkit.Bukkit;
import org.bukkit.plugin.java.JavaPlugin;

public class KitPVP extends JavaPlugin{
   
    public void onEnable() {
        Logger log = getLogger();
        log.info("/===================================/");
        log.info("/ Kit PVP v0.1 by Clybzotik enabled /");
        log.info("/===================================/");
        File config = new File(getDataFolder() + File.separator + "config.yml");
        if(!config.exists()) {
            getConfig().options().copyDefaults(true);
            saveDefaultConfig();
            getLogger().info("Create config...");
        }
        Connection c = null;
        Statement stmt = null;
        try {
            Class.forName("org.sqlite.JDBC");
            c = DriverManager.getConnection("jdbc:sqlite:" + getDataFolder() + File.separator + "Users.db");
            log.info("Get connection");
            stmt = c.createStatement();
            String sql = "CREATE TABLE IF NOT EXISTS USERS " +
                            "(ID INTEGER PRIMARY KEY AUTOINCREMENT , " +
                            " NICK           TEXT    NOT NULL UNIQUE, " + 
                            " KITS           TEXT    NOT NULL, " + 
                            " BALANCE        INT     NOT NULL, " + 
                            " KILLS          INT     NOT NULL, " + 
                            " DEATH          INT     NOT NULL) " ; 
            stmt.executeUpdate(sql);
            stmt.close();
            c.close();
        } catch ( Exception e ) {
             System.err.println( e.getClass().getName() + ": " + e.getMessage() );
             System.exit(0);
        } 
        Bukkit.getPluginManager().registerEvents(new Handler(), this);
        getCommand("stats").setExecutor(new CommandStats(this));
    }
} [CODE]

 

And what about the Handler class?
Try to strt your plugin without registering the Handler as a listener. Its mentioned in the error so maybe you create a new instance of the Main?

 

No, I dont have.

I tried, but the problem remained

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

 

UPD:
The problem is to transfer the main class by this method:
KitPVP plugin = new KitPVP();

 

so you create a new instance of your main in anoher class do I understand that right?

 

Yes.

 

Then I think we found the problem.
To pass the instance create a constructor in each class which needs the main. Do not create a new plugin inside your plugin

 

Can you write an example?

UPD:
Something like that?

Code:

    private KitPVP plugin;
    public Handler(KitPVP plugin) {
        this.plugin = plugin;
    }

 

Of course.
Lets say you need an instance of KitPvP in the class 'Handler':

Create a constructor in the Handler class which takes a KitPvP instance as its parameter:

Code:Java

private KitPvP main;
 
public Handler(KitPvP main) {
    this.main = main;
}

And if you call this constructor in KitPvP you pass 'this':

Code:Java

Bukkit.getPluginManager().registerEvents(new Handler(this), this);

 

Thanks.

 

you're welcome