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();
}
}
}

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