Help with Minigame .o/ !

When the plugin is enabled, nothing happens. Also, /run crashes the server. Any help?

Code:

package me.ohyes.enderchase;

import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.Sound;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
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.event.player.PlayerMoveEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin implements Listener {

    public static enum GAMESTATE{
         Loading(), CountdownLobby(), CountdownGame(), InGame(), PostGame();
    };
   
    public static GAMESTATE gameState;

    public int playerCount = Bukkit.getOnlinePlayers().size();
    public int maxPlayerCount = 1;

    public static String prefix = ChatColor.DARK_PURPLE + "[" + ChatColor.YELLOW + "EnderChase" + ChatColor.DARK_PURPLE
            + "] ";
   
    public final FileConfiguration config = this.getConfig();
   
    int loadinggame;
    int lobbycountdown;
    int gamecountdown;
   
    int countdowntimer1 = 10;
    int countdowntimer2 = 10;
   
    public ArrayList<Player> playersInGame = new ArrayList<Player>();
   
    ItemStack enderpearl = new ItemStack(Material.EYE_OF_ENDER);

    @Override
    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
        config.options().copyDefaults();
        saveDefaultConfig();
        initGame();
    }

    //Initialise Game
    private void initGame() {
        gameState = GAMESTATE.Loading;

        loadinggame = Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable(){

            @Override
            public void run() {
               
                if(playerCount == maxPlayerCount){
                    gameState = GAMESTATE.CountdownLobby;
                    runCountdownLobby();
                    Bukkit.getScheduler().cancelTask(loadinggame);
                }else{
                    return;
                }
               
            }
           
        }, 0L, 20L);
    }

    protected void runCountdownLobby() {

        if(gameState == GAMESTATE.CountdownLobby){
            lobbycountdown = Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable(){

                @Override
                public void run() {
                   
                    if(playerCount != maxPlayerCount){
                        gameState = GAMESTATE.Loading;
                        initGame();
                    }else{
                   
                    if(countdowntimer1 > 0){
                        countdowntimer1 --;
                        Bukkit.broadcastMessage(prefix + ChatColor.YELLOW + "Game Starting in... " + countdowntimer1);
                        for(Player all : Bukkit.getOnlinePlayers()){
                            all.getWorld().playSound(all.getLocation(), Sound.BLOCK_NOTE_BASEDRUM, 5, 5);
                        }
                    }else if(countdowntimer1 <= 0){
                        gameState = GAMESTATE.CountdownGame;
                        runCountdownGame();
                        countdowntimer1 = 10;
                        Bukkit.getScheduler().cancelTask(countdowntimer1);
                    }
                   
                  }
                }
               
            }, 0L, 20L);
        }
       
    }

    protected void runCountdownGame() {
        for(Player all : Bukkit.getOnlinePlayers()){
            all.teleport(new Location(all.getWorld(),0,20,0));
            playersInGame.add(all);
            all.getInventory().clear();
        }
       
        gamecountdown = Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable(){

            @Override
            public void run() {
               
               
                if(playerCount != maxPlayerCount){
                    Bukkit.broadcastMessage(prefix + ChatColor.YELLOW + "Game stopped. Not enough Players.");
                    countdowntimer2 = 10;
                    return;
                }else{
                    if(countdowntimer2 > 0){
                        countdowntimer2 --;
                        Bukkit.broadcastMessage(prefix + ChatColor.YELLOW + "The Game will begin in " + countdowntimer2 + " seconds...");
                    }else if(countdowntimer2 <= 0){
                        gameState = GAMESTATE.InGame;
                        runGame();
                        countdowntimer2 = 10;
                        Bukkit.getScheduler().cancelTask(gamecountdown);
                    }
                }
               
            }
           
        }, 0L, 20L);
       
       
    }
   
    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args){
        if(cmd.getName().equalsIgnoreCase("run")){
            initGame();
        }
        return false;
    }

       
    public void runGame() {
            for(Player all : Bukkit.getOnlinePlayers()){
                playersInGame.remove(all);
                all.getInventory().clear();
                all.getInventory().addItem(enderpearl);
            }
           
           
       
    }

    @EventHandler
    public void onPlayerMove(PlayerMoveEvent e){
        Player moved = e.getPlayer();
        if(playersInGame.contains(moved)){
            e.setCancelled(true);
        }
    }

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e) {
        Player joined = e.getPlayer();
        e.setJoinMessage(prefix + ChatColor.YELLOW + joined.getName() + ChatColor.LIGHT_PURPLE
                + " has joined the game. (" + ChatColor.YELLOW + playerCount + "/" + maxPlayerCount + ChatColor.LIGHT_PURPLE + ")");
    }

    @EventHandler
    public void onPlayerLeave(PlayerQuitEvent e) {
        Player left = e.getPlayer();
        e.setQuitMessage(prefix + ChatColor.YELLOW + left.getName() + ChatColor.LIGHT_PURPLE
                + " has left the game. (" + ChatColor.YELLOW + playerCount + "/" + maxPlayerCount + ChatColor.LIGHT_PURPLE + ")");
    }

}

 

Dont name your main classes "main"

This is only set once, and you are setting it before the server is even up. This will mean that PlayerCount will always be 0.

Don't abuse static.

1. You should use Sets and HashSets instead of arraylists
2. Save the Player's UUID, not the whole instance. This could cause memory leaks.

Besides from that: Your code is not organized and not (for lack of better words) "Optimized". Instead, create a GameStateManager, and create states such as "LobbyState" "Waiting State" "In-Game State" ect. Inside each state, write down what each state does, prints out,ect..