/**
 * Container, dem das spezifisch selektierten Feld übergeben wird
 */
public static class Container {
    private String orderList;
    private String businessCd;

    /**
     * CriteriaAPI übergibt an den Constructor.
     */
    public Container(String orderList, String businessCd) {
        this.orderList = orderList;
        this.businessCd = businessCd;
    }

    public String getOrderList() {
        return orderList;
    }

    public String getBusinessCd() {
        return businessCd;
    }
}

/**
 * Class getting the data
 */
class GetTheData {
    Set<String> getWithCriteriApiExercise(UniqueId businessExecutionId) {
        CriteriaBuilder criteriaBuilder = daoProvider.getEntityManager().getCriteriaBuilder();
        CriteriaQuery<Container> query = criteriaBuilder.createQuery(Container.class); // <-- !!! selbst definierte Empängerklasse (Container.class)
        Root<HpsBusiness> root = query.from(HpsBusiness.class);
        Join<HpsBusiness, HpsBusinessExec> joinBusiness = root.join(HpsBusiness._ATTR_businessExec, JoinType.INNER); //n:1
        Join<HpsBusiness, HpsExcludedPos> joinExcludedPos = root.join(HpsBusiness._ATTR_excludedPosList, JoinType.INNER); //1:n
        query.multiselect(joinExcludedPos.get(HpsExcludedPos._ATTR_orderIdList), root.get(HpsBusiness._ATTR_businessCd)) // <-- !!! multiselect Methode benutzen!!
                .where(criteriaBuilder.and(criteriaBuilder.equal(joinBusiness.get(HpsBusinessExec._ATTR_id), businessExecutionId),
                        criteriaBuilder.equal(joinExcludedPos.get(HpsExcludedPos._ATTR_reason), "deprecated")));
        TypedQuery<Container> typedQuery = daoProvider.getEntityManager().createQuery(query);
        return typedQuery.getResultList().stream().map(c -> c.getOrderList() + "/" + c.getBusinessCd()).collect(Collectors.toSet()); // get the fields from Container
    }
}