Forcing the pet defend the player

How I can set up a pet to attack a mob?

I'm storing the pet in a HashMap, and when the player is attacked by the pet should attack the mob, but no

Code:java

public void onEntityDamage(EntityDamageByEntityEvent event) {
 
if(!(event.getDamager() instanceof Player)){
Player player = (Player) event.getEntity();
LivingEntity damager = (LivingEntity) event.getDamager();
 
if(Pets.containsKey(player.getName())) {
 
Entity playerPet = Pets.get(player.getName());
//IF PLAYER IS THE PET OWNER CANCEL EVENT
if(playerPet.getUniqueId().hashCode() == damager.getUniqueId().hashCode()) {
event.setCancelled(true);
} else {
//DEFEND PLAYER
Creature pet = (Creature) playerPet;
pet.setTarget(damager);
}
}
}
}

What is wrong?

 

This library makes it easy to do what your doing, plus a hell of a load more, with any mob.