Refresh with Helper Method

gistfile1.java

public List<SchoolBus> findAll() {
    CriteriaBuilder criteriaBuilder = getEntityManager().getCriteriaBuilder();
    CriteriaQuery<SchoolBus> criteriaQuery = criteriaBuilder.createQuery(SchoolBus.class);
    Root<SchoolBus> table = criteriaQuery.from(SchoolBus.class);
    TypedQuery<SchoolBus> query = getEntityManager().createQuery(criteriaQuery.select(table).orderBy(criteriaBuilder.asc(table.get("busNumber"))));
    refreshSchoolBuses(query.getResultList());
    return query.getResultList();
}

public SchoolBus findById(Long id) {
    SchoolBus schoolBus = getEntityManager().find(SchoolBus.class, id);
    refreshSchoolBuses(schoolBus);
    return schoolBus;
} 

private void refreshSchoolBuses(SchoolBus... schoolBuses) {
    refreshSchoolBuses(Arrays.asList(schoolBuses));
}

private void refreshSchoolBuses(List<SchoolBus> schoolBuses) {
    for (SchoolBus schoolBus : schoolBuses) {
        schoolBus.getStudents().clear();
        getEntityManager().refresh(schoolBus);
    }
}