CriteriaBuilder cb = em.getCriteriaBuilder();
  CriteriaQuery<X1EnumEntity[]> query = cb.createQuery(X1EnumEntity[].class);
  Root<X1EnumEntity> from = query.from(X1EnumEntity.class);

  Expression<Object> isLoaded =
    cb.selectCase().when(cb.equal(from.get("x1"), X1Enum.GREEN), Long.valueOf(1)).otherwise(Long.valueOf(0));

  query.multiselect(isLoaded);
  em.createQuery(query).getResultList();

  @Column
  @Enumerated(EnumType.STRING)
  private X1Enum x1;

        CriteriaBuilder cb0 = em.getCriteriaBuilder();
        CriteriaQuery<X1EnumEntity> query0 = cb0.createQuery(X1EnumEntity.class);
        Root<X1EnumEntity> entity = query0.from(X1EnumEntity.class);

        query0.select(entity).where(cb0.equal(entity.get("x1"), X1Enum.GREEN));
        em.createQuery(query0).getResultList();

        String queryString = "SELECT var, CASE WHEN (var.x1 = :value) THEN 1 ELSE 0 END FROM X1EnumEntity var";
        Query query1 = em.createQuery(queryString);

        query1.setParameter("value", X1Enum.GREEN);
        List<String> list = query1.getResultList();