bukkit Hiding Players Hiding Player from an Entity


Example

This can be done by using the event EntityTargetEvent

Entities won't target the player if you cancel the event:

@EventHandler
public void onEntityTarget(EntityTargetEvent e) {
    Entity target = e.getEntity();
    if(target instanceof Player) {
        Player playerTargetted = (Player) target;
        if (shouldBeInvisible(playerTargetted) {
            e.setCancelled(true);    //Cancel the target event
        }
    }
}