This usually doesn't happen, as the entities with existing id will be only
merged rather than creating the new instance. Try checking your equals and
hashcode implementations for 'Articulo' class, as that plays a central role
in merge mechanism.
If you still want a workaround,
public void persistArticulo(Articulo articulo)
{
try {
EntityManager entityManager = entityManager();
entityManager.getTransaction().begin();
// if articule.id != null, merge
// else persist
entityManager.persist(articulo);
entityManager.getTransaction().commit();
entityManager.close();
return ;
}
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