@PersistenceContext
private EntityManager em;
public List<Abonnement> creerAbonnementDefault(){
List<Abonnement> list = new ArrayList<>();
list.add(new Abonnement("week-end",2,2.00));
list.add(new Abonnement("hebdomadaire",7,6.00));
list.add(new Abonnement("mensuel",30,25.00));
list.add(new Abonnement("annuel",365,250.00));
list.add(new Abonnement("à vie",55000,1000.00));
for(Abonnement g : list){
em.persist(g);
}