PlayerBean.java

@Stateless
public class PlayerBean {

    @PersistenceContext(unitName = "micro-PU")
    private EntityManager em;
 
    public void save(Player player){
        em.merge(player);
    }
    
    public void remove(Player player){
        em.remove(findById(player.getId()));
    }
    
    public Player findById(Long id){
        return em.find(Player.class, id);
    }
    
    public List<Player> findAll(){
        return em.createQuery("SELECT p FROM Player p").getResultList();
    }
}