Firework meta doesnt work

I tried this:

Code:

public ItemStack addFireworkEffect(ItemStack item, boolean hasFlicker, boolean hasTrail, Color color, Color fadeColor, FireworkEffect.Type type){
      FireworkMeta meta = (FireworkMeta)item.getItemMeta();
      FireworkEffect.builder().flicker(hasFlicker);
      FireworkEffect.builder().trail(hasTrail);
      FireworkEffect.builder().withColor(color);
      FireworkEffect.builder().withFade(color);
      FireworkEffect.builder().with(type);
      meta.addEffect(FireworkEffect.builder().build());
      return item;
  }

and stacktrace returned at the line where it said
FireworkMeta meta = (FireworkMeta)item.getItemMeta();
cause by java.lang.ClassCastException.
Any way to fix?

 

You have to set the meta at the end.

item.setMeta(meta);

 

nope, same error