MAIN:
package me.Askingg.Reflex;

import org.bukkit.entity.LivingEntity;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitRunnable;

import net.md_5.bungee.api.ChatColor;

public class Main extends JavaPlugin {

	public String prefix = (ChatColor.RED + "Reflex " + ChatColor.DARK_GRAY + "- " + ChatColor.WHITE);

	public void onEnable() {
		getServer().getConsoleSender().sendMessage(prefix + "Plugin successfully enabled.");
		getServer().getPluginManager().registerEvents(new Monsters(), this);
		Commands commands = new Commands();
		getCommand(commands.cmd1).setExecutor(commands);
		getCommand(commands.cmd2).setExecutor(commands);
		getCommand(commands.cmd3).setExecutor(commands);
		getCommand(commands.cmd4).setExecutor(commands);

		runnable();
		registerConfig();
		saveDefaultConfig();
	}

	public void onDisable() {
		getServer().getConsoleSender().sendMessage(prefix + "Plugin Successfully Disabled");
	}

	public void runnable() {
		new BukkitRunnable() {

			@SuppressWarnings("deprecation")
			@Override
			public void run() {
				for (LivingEntity e : getServer().getWorld("world").getLivingEntities()) {

					e.setCustomName(e.getType() + "" + ChatColor.DARK_GRAY + " (" + ChatColor.RED + e.getHealth()
							+ ChatColor.DARK_GRAY + " / " + ChatColor.RED + e.getMaxHealth() + ChatColor.DARK_GRAY
							+ ")");
					e.setCustomNameVisible(true);
				}
			}

		}.runTaskTimerAsynchronously((Plugin) this, 0, 10);
	}

	private void registerConfig() {
		getConfig().options().copyDefaults(true);
		saveConfig();
	}

}




COMMANDS:
package me.Askingg.Reflex;

import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;

import net.md_5.bungee.api.ChatColor;

public class Commands implements CommandExecutor {

	public String cmd1 = "giveitem";
	public String cmd2 = "prefix";
	public String cmd3 = "discord";
	public String cmd4 = "config";
	public String prefix = (ChatColor.RED + "Reflex " + ChatColor.DARK_GRAY + "- " + ChatColor.WHITE);

	@Override
	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
		if (sender instanceof Player) {
			if (cmd.getName().equalsIgnoreCase(cmd1)) {
				if (args.length != 0) {
					Material item = Material.getMaterial(args[0].toUpperCase());
					if (item != null) {
						Inventory inv = ((Player) sender).getInventory();
						inv.addItem(new ItemStack(item, 1));
						sender.sendMessage(ChatColor.AQUA + "You were given one " + ChatColor.DARK_AQUA + args[0]);
						return true;
					} else {
						sender.sendMessage(ChatColor.RED + args[0] + ChatColor.WHITE + " is not a valid item.");
						return true;
					}
				} else {
					sender.sendMessage(ChatColor.RED + "Not enough arguements.");
					return true;
				}
			}

			if (cmd.getName().equalsIgnoreCase(cmd2)) {
				sender.sendMessage(prefix + "Prefix test command");
				return true;
			}

			if (cmd.getName().equalsIgnoreCase(cmd3)) {
				sender.sendMessage(ChatColor.WHITE + "Join the discord at " + ChatColor.RED + "discord.gg/AW8U7pF"
						+ ChatColor.WHITE + " !");
				return true;
			}

			if (cmd.getName().equalsIgnoreCase(cmd4)) {
				sender.sendMessage(ChatColor.RED + "Hi");
			}

		} else {
			sender.sendMessage(ChatColor.RED + "You must be a player to use this command.");
			return true;
		}
		return false;
	}

}




COMMANDS:
package me.Askingg.Reflex;

import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;

import net.md_5.bungee.api.ChatColor;

public class Commands implements CommandExecutor {

	public String cmd1 = "giveitem";
	public String cmd2 = "prefix";
	public String cmd3 = "discord";
	public String cmd4 = "config";
	public String prefix = (ChatColor.RED + "Reflex " + ChatColor.DARK_GRAY + "- " + ChatColor.WHITE);

	@Override
	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
		if (sender instanceof Player) {
			if (cmd.getName().equalsIgnoreCase(cmd1)) {
				if (args.length != 0) {
					Material item = Material.getMaterial(args[0].toUpperCase());
					if (item != null) {
						Inventory inv = ((Player) sender).getInventory();
						inv.addItem(new ItemStack(item, 1));
						sender.sendMessage(ChatColor.AQUA + "You were given one " + ChatColor.DARK_AQUA + args[0]);
						return true;
					} else {
						sender.sendMessage(ChatColor.RED + args[0] + ChatColor.WHITE + " is not a valid item.");
						return true;
					}
				} else {
					sender.sendMessage(ChatColor.RED + "Not enough arguements.");
					return true;
				}
			}

			if (cmd.getName().equalsIgnoreCase(cmd2)) {
				sender.sendMessage(prefix + "Prefix test command");
				return true;
			}

			if (cmd.getName().equalsIgnoreCase(cmd3)) {
				sender.sendMessage(ChatColor.WHITE + "Join the discord at " + ChatColor.RED + "discord.gg/AW8U7pF"
						+ ChatColor.WHITE + " !");
				return true;
			}

			if (cmd.getName().equalsIgnoreCase(cmd4)) {
				sender.sendMessage(ChatColor.RED + "Hi");
			}

		} else {
			sender.sendMessage(ChatColor.RED + "You must be a player to use this command.");
			return true;
		}
		return false;
	}

}




PLUGIN.YML:
name: Reflex
author: Askingg
version: "1.0"
main: me.Askingg.Reflex.Main
description: Custom plugin for Reflex SMP
commands:
    giveitem:
        usage: /<command>
        description: Get any minecraft item.
    prefix:
        usage: /<command>
        description: String test command.
    discord:
        usage: /<command>
        description: View the discord invitation link.
    config:
        usage: /<command>
        description: Test configureable command.




CONFIG.YML:
# Change the custom message, this is my first configureable message.
Custom Message: '&fConfigurable custom message of &cReflex&f. Hello %p!'