public List findAll(Class type, Integer pageNumber, Integer pageSize) {
    CriteriaBuilder criteriaBuilder = this.em.getCriteriaBuilder();

    CriteriaQuery<Long> countQuery = criteriaBuilder
            .createQuery(Long.class);
    countQuery.select(criteriaBuilder.count(countQuery.from(type)));
    Long count = this.em.createQuery(countQuery).getSingleResult();

    CriteriaQuery<Class> criteriaQuery = criteriaBuilder.createQuery(type);
    Root<Class> from = criteriaQuery.from(type);
    CriteriaQuery<Class> select = criteriaQuery.select(from);

    TypedQuery<Class> typedQuery = this.em  .createQuery(select);
    while (pageNumber < count.intValue()) {
        typedQuery.setFirstResult(pageNumber - 1);
        typedQuery.setMaxResults(pageSize);
        System.out.println("Current page: " + typedQuery.getResultList());
        pageNumber += pageSize;
    }

    return null;
}