Code

import java.util.ArrayList;
import java.util.HashMap;
import java.util.UUID;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.WorldCreator;
import org.bukkit.block.BlockFace;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Arrow;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.entity.EntityDamageByEntityEvent;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.event.entity.PlayerDeathEvent;
import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
import org.bukkit.event.player.PlayerFishEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.event.player.PlayerRespawnEvent;
import org.bukkit.permissions.PermissionAttachment;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin implements Listener{
	public HashMap<UUID,PermissionAttachment> playerPermissions = new HashMap<>();
	@Override
	public void onEnable() {
		getLogger().info("Hello, plugin has started up correctly!");
		WorldCreator wc = new WorldCreator("ArcadeMap");
		Bukkit.createWorld(wc);
		WorldCreator wc2 = new WorldCreator("Superflat");
		Bukkit.createWorld(wc2);
		WorldCreator wc3 = new WorldCreator("Random");
		Bukkit.createWorld(wc3);
		this.getConfig().options().copyDefaults(true);
		this.saveConfig();
		this.getServer().getPluginManager().registerEvents(this, this);
	}
	@Override
	public void onDisable(){
		playerPermissions.clear();
	}
	public static ArrayList<Player> ps = new ArrayList<>();
	public static boolean canJoin = true;
	public static boolean gameStarted = false;
	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
		if(sender instanceof Player){
			Player p = (Player)sender;
			World w1 = getServer().getWorld("Superflat");
			World w2 = getServer().getWorld("Arcade");
			Location loc = new Location(w1, 0.5, 22, 0.5);
			Location loc2 = new Location(w2, 0.5, 22, 0.5);
			if(cmd.getName().equalsIgnoreCase("hub")){
				p.teleport(loc);
				return true;
			}else if(cmd.getName().equalsIgnoreCase("join")){
				int length = args.length;
				if(length>0){
					if(args[0].equalsIgnoreCase("ctk")){
						if(canJoin){
							ps.add(p);
							p.teleport(loc2);
							if(ps.size()==10){
								canJoin = false;
							}
						}else{
							p.sendMessage(ChatColor.RED + "This Game Is Full, Please Try Again In A Bit");
						}
					}else{
						p.sendMessage(ChatColor.RED + "The Correct Usage Is\n/join ctk");
					}
				}else{
					p.sendMessage(ChatColor.RED + "The Correct Usage Is\n/join ctk");
				}
				return true;
			}else if(cmd.getName().equalsIgnoreCase("forcestart")){
				if(p.hasPermission("mc.mod")){
					canJoin = false;
				}else{
					p.sendMessage(ChatColor.RED + "You do not have sufficient permissions");
				}
			}else if(cmd.getName().equalsIgnoreCase("stopspam")){
				ps.removeAll(ps);
				canJoin = true;
			}
		}else{
			sender.sendMessage(ChatColor.RED + "You Must Be A Player");
		}
		return false;
	}
	@EventHandler
	public void onPlayerJoin(PlayerJoinEvent event) {
		Player player = event.getPlayer();
		Location  loc = new Location(Bukkit.getWorld("Superflat"), 0.5, 22, 0.5);
		player.teleport(loc);
		event.setJoinMessage("");
		setupPermissions(player);
	}
	@EventHandler
	public void onPlayerRespawn(PlayerRespawnEvent e) {
		Player p = e.getPlayer();
		Location  loc = new Location(p.getWorld(), 0.5, 22, 0.5);
		e.setRespawnLocation(loc);
	}
	@EventHandler
	public void onPlayerDeath(PlayerDeathEvent e) {
		Player p = e.getEntity();
		Bukkit.broadcastMessage(ChatColor.DARK_PURPLE + p.getName() + " died.");
		e.setDeathMessage("");
	}
	@EventHandler
	public void onBlock(PlayerMoveEvent e){
		Player p = e.getPlayer();
		if(canJoin){
			if(p.getLocation().getBlock().getRelative(BlockFace.DOWN).getType()==Material.REDSTONE_LAMP_ON){
				Location loc = new Location(Bukkit.getWorld("ArcadeMap"), 0.5, 22, 0.5);
				p.teleport(loc);
				p.sendMessage(ChatColor.GREEN + "You Have Joined \"Catch The Killer\"");
				ps.add(p);
				if(ps.size() == 9){
					canJoin = false;
				}
			}
		}else{
			p.sendMessage(ChatColor.RED + "This Game Is Full, Please Try Again In A Bit");
		}
	}
	@SuppressWarnings("deprecation")
	@EventHandler
	public void onDamage(EntityDamageByEntityEvent e){
		Entity damager = e.getDamager();
		Entity damaged = e.getEntity();
		Location loc = new Location(damaged.getWorld(), 0.5, 22, 0.5);
		if(damaged instanceof Player){
			Player dmgd = (Player)damaged;
			if(damager instanceof Player){
				Player dmgr = (Player)damager;
				if(dmgr.getItemInHand().getType() == Material.IRON_SWORD){
					dmgd.teleport(loc);
					e.setCancelled(true);
				}
			}else if(damager instanceof Arrow){
				dmgd.teleport(loc);
				e.setCancelled(true);
			}
		}
		e.setCancelled(true);
	}
	@EventHandler
	public void onFallDamage(final EntityDamageEvent e){
        if (e.getCause() == DamageCause.FALL&&e.getEntity() instanceof Player) {
        	e.setCancelled(true);
        }
	}
	public void setupPermissions(Player player){
		PermissionAttachment attachment = player.addAttachment(this);
		this.playerPermissions.put(player.getUniqueId(), attachment);
		permissionSetter(player.getUniqueId());
	}
	private void permissionSetter(UUID uuid){
		PermissionAttachment attachment = this.playerPermissions.get(uuid);

		for(String groups : this.getConfig().getConfigurationSection("Groups").getKeys(false)){
			for(String permissions : this.getConfig().getStringList("Groups" + groups + ".permissions")){
				attachment.setPermission(permissions, true);
			}
		}
	}
	@EventHandler
	public void leave(PlayerQuitEvent e){
		Player p = e.getPlayer();
		playerPermissions.remove(p.getUniqueId());
		ps.remove(p);
	}
	@EventHandler
	public void blockBreak(BlockBreakEvent e){
		Player p = e.getPlayer();
		if(p.hasPermission("mc.mod")){

		}else{
			e.setCancelled(true);
			p.sendMessage(ChatColor.RED + "You do not have sufficient permissions");
		}
	}
	@EventHandler
    public void onPlayerFishingEvent(PlayerFishEvent event){
		Player p = event.getPlayer();
		p.setHealth(0);
	}
}