AutoMessage

package me.matthijs110.CustomTeleport;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;

public class AutoMessage extends Main implements Listener {

	public void OnEnable() {
		AmTask();
		AmTask2();
	}

	public void AmTask() {
		Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
			public void run() {
				for(Player player : Bukkit.getOnlinePlayers())	{
					player.sendMessage(ChatColor.AQUA + "This is a Automessage test");
				}
			}
		}, 0, 5 * 20); //20 ticks = 1 second!
	}
	public void AmTask2() {
		Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
			public void run() {
				for(Player player : Bukkit.getOnlinePlayers())	{
					player.sendMessage(ChatColor.BLUE + "This is a Automessage test");
				}
			}
		}, 0, 10 * 20); //20 ticks = 1 second!
	}
}

ColoredSigns

package me.matthijs110.CustomTeleport;

import org.bukkit.ChatColor;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.SignChangeEvent;

public class ColoredSigns implements Listener {
	
	@EventHandler
    public void onSign(SignChangeEvent e)
    {
        if(e.getPlayer().hasPermission("perm.ission"))
        {
            e.setLine(0, ChatColor.translateAlternateColorCodes('&', e.getLine(0)));
            e.setLine(1, ChatColor.translateAlternateColorCodes('&', e.getLine(1)));
            e.setLine(2, ChatColor.translateAlternateColorCodes('&', e.getLine(2)));
            e.setLine(3, ChatColor.translateAlternateColorCodes('&', e.getLine(3)));
        }
    }
}

ConfigListener

package me.matthijs110.CustomTeleport;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.Sign;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class ConfigListener extends JavaPlugin {
	
	public void onEnable(){
		saveDefaultConfig();
	}
	
	@EventHandler
	public void onPlayerInteract(PlayerInteractEvent event) {
		Player player = event.getPlayer();
		Block b = event.getClickedBlock();
		@SuppressWarnings("unused")
		Action action = event.getAction();
		
		if(event.getAction().equals(Action.RIGHT_CLICK_BLOCK)) {
			if(event.getClickedBlock().getState() instanceof Sign){
				Sign sign = (Sign) b.getState();
				if (sign.getLine(0).equals(ChatColor.BLUE + "Right click")
						&& (sign.getLine(1).equals(ChatColor.BLUE + "For your"))
						&& (sign.getLine(2).equals(ChatColor.BLUE + "Diamond!"))){
					player.sendMessage(ChatColor.GREEN + "Enjoy your Diamond! WORKS");
					if(getConfig().getBoolean("players." + player.getName())){
						player.sendMessage(ChatColor.RED + "You already got your diamond!");
						return;
					}
					player.getInventory().addItem(new ItemStack(Material.DIAMOND, 1));
					player.sendMessage(ChatColor.GREEN + "Enjoy your Diamond!");
					
					getConfig().set("players." + player.getName(), true);
					saveConfig();
				}
			}
		}
	}
	
}

Main

package me.matthijs110.CustomTeleport;

import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Color;
import org.bukkit.FireworkEffect;
import org.bukkit.Location;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Firework;
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.PlayerQuitEvent;
import org.bukkit.inventory.meta.FireworkMeta;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;

public class Main extends JavaPlugin implements Listener {

	public void onEnable(){
		PluginManager pm = getServer().getPluginManager();
		pm.registerEvents(this, this);
		pm.registerEvents(new ColoredSigns(), this);
		pm.registerEvents(new AutoMessage(), this);
		saveDefaultConfig();
	}
	
	public void Firework(Player player){
		Firework fw = (Firework) player.getWorld().spawnEntity(player.getLocation(), EntityType.FIREWORK);
		FireworkMeta fwmeta = fw.getFireworkMeta();
		FireworkEffect.Builder builder = FireworkEffect.builder();
		builder.withTrail();
		builder.withFlicker();
		builder.withFade(Color.RED);
		builder.withColor(Color.ORANGE);
		builder.withColor(Color.YELLOW);
		builder.withColor(Color.LIME);
		builder.withColor(Color.TEAL);
		builder.withColor(Color.PURPLE);
		builder.withColor(Color.FUCHSIA);
		builder.with(FireworkEffect.Type.BALL);
		fwmeta.addEffects(builder.build());
		fwmeta.setPower(1);
		fw.setFireworkMeta(fwmeta);
	}

	ArrayList <String> afkList = new ArrayList <String> ();
	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
		Player player = (Player) sender;
		Location helploc = new Location(Bukkit.getServer().getWorld("World"), 120, 54, 365);
		Location spawnloc = new Location(Bukkit.getServer().getWorld("World"), 346, 84, 336);

		//*Help teleport*\\
		if (sender.hasPermission("server.teleport.help")) {
			if(cmd.getName().equalsIgnoreCase("help")){
				player.teleport(helploc);
				player.sendMessage(ChatColor.AQUA + "Teleported to the Info Wall");
			} else {
				player.sendMessage(ChatColor.WHITE + "Unknown command. Type \"help\" for help");
			}
		}

		//*Spawn Location*\\
		if (sender.hasPermission("server.teleport.spawn")) {
			if(cmd.getName().equalsIgnoreCase("spawn")){
				player.sendMessage(ChatColor.GREEN + "Teleporting to spawn..");
				player.teleport(spawnloc);
			}
		}

		//*Heal Command*\\
		if (sender.hasPermission("server.heal")) {
			if(cmd.getName().equalsIgnoreCase("heal"))	{
				player.setHealth(20.0);
				player.setFoodLevel(20);
				sender.sendMessage(ChatColor.GREEN + "You have been healted!");
			}
			for (PotionEffect effect : player.getActivePotionEffects())
			{
				player.removePotionEffect(effect.getType());
			}
			if (sender.hasPermission("server.heal.other")) {
				Player target = Bukkit.getServer().getPlayer(args[0]);
				if (target != null) {
					target.setHealth(20.0);
				} else {
					sender.sendMessage(ChatColor.WHITE + "Unknown command. Type \"help\" for help");
				}

				//*Suicide Command*\\
				if (sender.hasPermission("server.suicide")) {
					if(cmd.getName().equalsIgnoreCase("kill")) {
						player.setHealth(0.0);
						sender.sendMessage(ChatColor.DARK_RED + "You committed suicide!");
						Bukkit.broadcastMessage(ChatColor.GOLD + player.getName() + ChatColor.DARK_AQUA + " Committed suicide");
					}
				}
		
				//*AFK Command*\\
				if (sender.hasPermission("server.afk"))
					if (cmd.getName().equalsIgnoreCase("afk")) {
						if (!afkList.contains(player.getName())) {
							afkList.add(player.getName());
							Bukkit.getServer().broadcastMessage(ChatColor.GOLD + player.getName() + ChatColor.GRAY + " is now AFK");
						} else {
							afkList.remove(player.getName());
							Bukkit.getServer().broadcastMessage(ChatColor.GOLD + player.getName() + ChatColor.GRAY + " is no longer AFK");
						}
					}
			
				//*Broadcasting*\\
				if(cmd.getName().equalsIgnoreCase("broadcast"))
				{
					if(sender.isOp() || sender.hasPermission("server.broadcast"))
					{
						if(args.length == 0)
						{
							sender.sendMessage(ChatColor.YELLOW + "Usage: " + ChatColor.GOLD + "/broadcast" + ChatColor.GREEN + "<message>");
						}
						else
						{
							String msg = "";
							for (int i = 0; i < args.length; i++)
							{
								msg = msg + args[i] + " ";
							}
							{
								Bukkit.broadcastMessage(ChatColor.translateAlternateColorCodes('&',  msg));
							}
						}
					}
					else
					{
						sender.sendMessage(ChatColor.WHITE + "Unknown command. Type \"help\" for help");
					}
				}
			}
		}
		return false;
	}
	//*Join-Leave Messages*\\
	@EventHandler
	public void onPlayerJoin(PlayerJoinEvent event){
		Player p = event.getPlayer();
		if(p.hasPlayedBefore()){
			event.setJoinMessage(ChatColor.GOLD + p.getPlayerListName() + ChatColor.GRAY + " has joined the game!");
			p.sendMessage(ChatColor.DARK_GREEN + "" + ChatColor.STRIKETHROUGH + "----------------------------------------------------");
			p.sendMessage(ChatColor.AQUA + "Welcome to the Castle Crystals server!");
			Integer amount = Bukkit.getOnlinePlayers().length;
			p.sendMessage(ChatColor.BLUE + "There are now " + ChatColor.YELLOW + amount + ChatColor.BLUE + " player(s) online!");
			p.sendMessage(ChatColor.DARK_GREEN + "" + ChatColor.STRIKETHROUGH + "----------------------------------------------------");
		} else {
			Bukkit.broadcastMessage(ChatColor.GREEN + "Welcome to the server " + ChatColor.YELLOW + p.getPlayerListName() + ChatColor.GREEN + "!");
			Firework(event.getPlayer());
		}
	}
	@EventHandler
	public void onPlayerQuit(PlayerQuitEvent event){
		Player p = event.getPlayer();
		event.setQuitMessage(ChatColor.GOLD + p.getPlayerListName() + ChatColor.GRAY + " has left the game!");
	}
}