Bukkit - Firework Trail Effects as Passengers for projectiles (arrows/snowballs)

This is what I have coded so far I am confused I would love and have some help with this. thanks guys and for all you do!

- I would like to add a firewor passenger with a detonation effect that follows the snowball projectile. I cant wrap my head round it. cheers agin

//START OF CODE

@EventHandler (priority = EventPriority.NORMAL)
public void onFrostcall001hit (EntityDamageByEntityEvent event) {
if (event.getDamager() instanceof Player ) { //If is player with sword
Player attacker = (Player) event.getDamager();
LivingEntity damaged = (LivingEntity) event.getEntity();

if (attacker.getInventory().getItemInMainHand().getItemMeta().getLore().contains(ChatColor.WHITE + "Special: " + ChatColor.GRAY + "Frost Call I ")) { //If the attacker is wielding a diamond sword, you can customize this to any thing you want
//PotionEffect potionEffect = new PotionEffect(PotionEffectType.WEAKNESS, 90, 0); //Replace this with your potion effect of choice
Random rand = new Random();
int number = rand.nextInt(100) + 1;
if(number >= 75) { //25%
//Your code here
//Your code here
//potionEffect.apply(damaged); //Apply the potion effect
//Soul Arrow summon

attacker.launchProjectile(Snowball.class);


attacker.sendMessage(ChatColor.DARK_AQUA + (ChatColor.BOLD + "* Summoned Frostball *"));
damaged.sendMessage(ChatColor.DARK_AQUA + (ChatColor.BOLD + "* Ffrostball has been summoned by Foe *"));
} else {
attacker.sendMessage(ChatColor.DARK_AQUA + (ChatColor.BOLD + "* Failed to Summon Frostball *"));
}
}
}
}
//END OF CODE


I am aware of the following:

snwball.addPassenger(f);
f.detonate()

but do not know how to have a loop of the effect trailing the snowball when launched....

Thanks again for any help.
~