public class Main extends JavaPlugin implements Listener {

    private HashMap<String, Integer> AFK;

	public void onEnable() {
        this.AFK = new HashMap<String, Integer>();
        addAFK();
        Bukkit.getPluginManager().registerEvents((Listener) this, this);
	}

	public void addAFK() {
        for (final Player p : Bukkit.getOnlinePlayers()) {
        Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
            public void run() {
        		if(!AFK.containsKey(p.getName())) {
                    AFK.put(p.getName(), 1);
        		}else { PlayParticles(); }
            }
    }, 0, 5);
   }
  }

	public void PlayParticles() {
        for (final Player p : Bukkit.getOnlinePlayers()) {
                World w = p.getWorld();
                w.spawnParticle(Particle.END_ROD, p.getLocation().getX(), p.getLocation().getY() + 2.5, p.getLocation().getZ(), 60, 0.5, 0.1, 0.5, 0, null);
   }
  }


	@EventHandler
	public void onMove(PlayerMoveEvent e) {
		if(AFK.containsKey(e.getPlayer().getName())) {
			AFK.remove(e.getPlayer().getName());
		}
	}

}