Solved "public int" not work on my Plugin

Hello.
Since few hours, I try to make a plugin for a mini-games. But actually, I've a problem. I can't get a int from a public (same for a String).

This is my Spoink.class

Code:

package me.pokeball.slimeball;

import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scoreboard.Team;

import java.util.HashMap;
import java.util.logging.Logger;

public class Spoink extends JavaPlugin implements Listener {
    public HashMap<Player, Team> playerTeam = new HashMap<Player, Team>();
    FileConfiguration config = getConfig();

    private static final Logger log = Logger.getLogger("Minecraft");

    public void onEnable() {
        this.getServer().getPluginManager().registerEvents(this, this);
        log.info(String.format("Le plugin magistral de PokeBall a été loadé", getDescription().getName()));
        loadConfiguration();
    }

    public void onDisable() {
        this.saveConfig();
    }
    public int started = 1;
    public int playersCount = 0;
    public String prefix = ChatColor.AQUA + "[SlimeBall] " + ChatColor.GRAY;

    public void loadConfiguration() {
        getConfig().addDefault("game.maxplayers", 12);
        getConfig().addDefault("game.minplayers", 8);
        getConfig().addDefault("game.pvp", false);
        getConfig().options().copyDefaults(true);
        saveConfig();
    }

    @EventHandler
    public void playerOnJoin(PlayerJoinEvent event) {
        new Join().joinEvent(event);
    }

}

And this is my Join class, the class who use the public variables to get information.

Code:

package me.pokeball.slimeball;

import me.pokeball.slimeball.Gui.GiveBook;
import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.event.player.PlayerJoinEvent;

public class Join {
    public void joinEvent(PlayerJoinEvent event) {
        if(new Spoink().playersCount < 12) {
            event.getPlayer().setGameMode(GameMode.ADVENTURE);
            new Spoink().playersCount++;;
            event.setJoinMessage(new Spoink().prefix + ChatColor.YELLOW + event.getPlayer().getName() + " a rejoint la partie (" + new Spoink().playersCount + "/12)");
            new GiveBook().onClickBook(event.getPlayer());
        }
        else {
            event.getPlayer().setGameMode(GameMode.SPECTATOR);
            event.getPlayer().sendMessage(new Spoink().prefix + "La partie a déjà démmaré, vous avez été redirigé en mode spectateur");
            event.setJoinMessage(null);
        }

    }
}

"new Spoink().playersCount" not work and It show an error on logs. Same for other "new Spoink().<public var>"

Can you help me to solve this problems please.
If you want, I can give you some logs about the error.

Thanks for reading,
ChocoCraft74

 

Code:

package me.pokeball.slimeball;

import me.pokeball.slimeball.Gui.GiveBook;
import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.event.player.PlayerJoinEvent;

public class Join {
    Spoink spoink = new Spoink();
    public void joinEvent(PlayerJoinEvent event) {
        if(spoink.playersCount < 12) {
            event.getPlayer().setGameMode(GameMode.ADVENTURE);
            new Spoink().playersCount++;;
            event.setJoinMessage(spoink.prefix + ChatColor.YELLOW + event.getPlayer().getName() + " a rejoint la partie (" + spoink.playersCount + "/12)");
            new GiveBook().onClickBook(event.getPlayer());
        }
        else {
            event.getPlayer().setGameMode(GameMode.SPECTATOR);
            event.getPlayer().sendMessage(spoink.prefix + "La partie a déjà démmaré, vous avez été redirigé en mode spectateur");
            event.setJoinMessage(null);
        }

    }
}

I need to do that ?
(but actually, always not work)