Bukkit

public class WispEnchant extends CustomEnchantment {
         
    static final String[] WILLOWWISP_ITEMS = new String[] {
            "wood_sword", "stone_sword", "iron_sword", "gold_sword", "diamond_sword"};
   
    static final int COOLDOWN = 5000;
 
    Hashtable<String, Long> timers = new Hashtable<String, Long>();
   
 
    public WispEnchant() {
        super("Willow Wisp", WILLOWWISP_ITEMS);
    }
   
    @Override
    public void applyMiscEffect(Player player, int level, PlayerInteractEvent event) {
        if (timers.get(player.getName()) == null) timers.put(player.getName(), 0l);
        if (System.currentTimeMillis() - timers.get(player.getName()) < COOLDOWN) return;
        if (event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
            event.getPlayer().launchProjectile(SmallFireball.class);
            event.getPlayer().launchProjectile(SmallFireball.class);
            event.getPlayer().launchProjectile(SmallFireball.class);
            player.getWorld().playSound(player.getLocation(), Sound.ENDERDRAGON_GROWL, 1, 1);
            timers.put(player.getName(), System.currentTimeMillis());
        }
    }
   
   
    @Override
    public int getEnchantmentLevel(int expLevel) {
        return 1;
    }
}