yeah

    List<Entity> falls = new ArrayList<Entity>();

    @Override
    public void onEnable() {
    Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
       @Override
       public void run(){
            for(Entity e:falls){
                if(e.getLocation().getY() > 255){
                    falls.remove(e);
                 e.remove();
             }
          }
     }
},20,10);

    @EventHandler
    public void onSpa(EntitySpawnEvent event){
    if(event.getEntity().getType().equals(EntityType.FALLINBLOCK)){
    falls.add(event.getEntity());
    }
    }