public class Main extends JavaPlugin {

	private Field nameField;

	@Override
	public void onEnable() {
		nameField = getField(GameProfile.class, "name");
	}

	@Override
	public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {

		if (command.getName().equalsIgnoreCase("nick")) {
			if (sender instanceof Player) {
				if (args.length == 1) {
					Player p = (Player) sender;
						String name = args[0];
						System.out.println(name);
						CraftPlayer cp = (CraftPlayer) p;

						try {
							nameField.set(cp.getProfile(), name);
						} catch (IllegalArgumentException | IllegalAccessException e1) {
							e1.printStackTrace();
						}
						PacketPlayOutEntityDestroy destroy = new PacketPlayOutEntityDestroy(cp.getEntityId());
						sendPacket(destroy);
						removeFromTab(cp);

						new BukkitRunnable() {

							@Override
							public void run() {
								addtoTab(cp);
								PacketPlayOutNamedEntitySpawn spawn = new PacketPlayOutNamedEntitySpawn(cp.getHandle());
								for (Player all : Bukkit.getOnlinePlayers()) {
									if (!((CraftPlayer)all).equals(cp)) {
										((CraftPlayer)all).getHandle().playerConnection.sendPacket(spawn);
									}
								}
							}
						}.runTaskLater(this,5);

					}
				}
			}
		return false;

	}

	private void removeFromTab(CraftPlayer cp) {
		PacketPlayOutPlayerInfo packet = new PacketPlayOutPlayerInfo(EnumPlayerInfoAction.REMOVE_PLAYER, cp.getHandle());
		sendPacket(packet);
	}

	private void addtoTab(CraftPlayer cp) {
		PacketPlayOutPlayerInfo packet = new PacketPlayOutPlayerInfo(EnumPlayerInfoAction.ADD_PLAYER, cp.getHandle());
		sendPacket(packet);
	}

	private void sendPacket(Packet<?> packet) {
		for (Player current : Bukkit.getOnlinePlayers()) {
			((CraftPlayer) current).getHandle().playerConnection.sendPacket(packet);
		}
	}

	private Field getField(Class<?> clazz, String name) {

		try {
			Field field = clazz.getDeclaredField(name);
			field.setAccessible(true);
			return field;
		} catch (NoSuchFieldException e) {
			e.printStackTrace();
			return null;
		} catch (SecurityException e) {
			e.printStackTrace();
			return null;
		}

	}
}