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Update Query Result in JPA
EntityManager em = EMF.get().createEntityManager();
    Profile user = null;
    Query q = null;
    try{
        q = em.createNamedQuery("Profile.getRandomProfile");
        q.setParameter("random", Math.random());
        q.setMaxResults(1);
        user = (Profile) q.getSingleResult();

        user.setRandom( Math.random() );

    } catch(NoResultException ex){
            ex.printStackTrace();
    }