JPA / Hibernate не может использовать управляющий поток и регистр выбора в критериях API

Question

Я использую hibernate в качестве реализации JPA для запуска selectcase и groupby в одном и том же критерии API-запроса.К сожалению, это дает мне нулевое исключение, которое я не понимаю, почему.Ниже приведена более короткая версия реального запроса для простоты:

    CriteriaBuilder builder = em.getCriteriaBuilder();

    CriteriaQuery<Tuple> criteria = builder.createTupleQuery();

    Root<ProductItem> pi = criteria.from(ProductItem.class);

    Join<ProductItem, Ereturn> er = pi.join("ereturn", JoinType.LEFT);
    Join<ProductItem, User> shipper = er.join("shipper", JoinType.LEFT);
    Join<ProductItem, User> carrier = er.join("carrier", JoinType.LEFT);
    Join<ProductItem, User> consignee = er.join("consignee", JoinType.LEFT);
    Join<ProductItem, User> destination = er.join("destination", JoinType.LEFT);
    Join<ProductItem, ProductDefinition> pd = pi.join("product", JoinType.LEFT);
    Join<ProductItem, Receptacle> receptacle = pi.join("receptacle", JoinType.LEFT);
    Join<Receptacle, MasterCrossDock> mcd = receptacle.join("masterCrossDock", JoinType.LEFT);

    criteria.select( 
            builder.tuple(
                    er.get("id").alias("er_id"), er.get("globalId").alias("globalId"), er.get("rma").alias("rma"), er.get("trackingNumber").alias("trackingNumber"), er.get("invoice").alias("invoice")
                    , builder.selectCase()
                        .when(pi.get("scanDateTime").isNull(), "item to arrive")
                        .when(pi.get("scanDateTime").isNotNull(), "received")
                        .when(mcd.get("dispatchDate").isNotNull(), "in transit")
                        .when(mcd.get("completionDate").isNotNull(), "completed")
                        .alias("ereturn_status")
                    , er.get("carrier").get("id").alias("carrier_id"), er.get("carrier").get("firstName").alias("carrier_fn")
                    , er.get("shipper").get("id").alias("shipper_id"), er.get("shipper").get("firstName").alias("shipper_fn")
                    , er.get("consignee").get("id").alias("consignee_id"), er.get("consignee").get("firstName").alias("consignee_fn"), er.get("consignee").get("lastName").alias("consignee_ln")
                    , builder.count(pi.get("id")).alias("num_products")
                    , pi.get("receptacle").get("id").alias("r_id"), pi.get("receptacle").get("closed").alias("closed")
                    , mcd.get("id").alias("mcd_id"), mcd.get("dispatchDate").alias("dispatchDate"), mcd.get("completionDate").alias("completionDate")
                    )
            );

    criteria.groupBy(er.get("id"), er.get("globalId"), er.get("rma"), er.get("trackingNumber"), er.get("invoice")
            , builder.selectCase()
            .when(pi.get("scanDateTime").isNull(), "item to arrive")
            .when(pi.get("scanDateTime").isNotNull(), "received")
            .when(mcd.get("dispatchDate").isNotNull(), "in transit")
            .when(mcd.get("completionDate").isNotNull(), "completed"));

    TypedQuery<Tuple> q = em.createQuery( criteria );

    if (first >= 0 && window > 0) {
        q.setFirstResult(first).setMaxResults(window);
    }

    List<Tuple> tuples = q.getResultList();

И это ошибка, которую я получаю (java.lang.NullPointerException), которая мне ничего не объясняет:

SEVERE: Servlet.service() for servlet [jersey-servlet] in context with path [/returnitRest] threw exception [java.lang.NullPointerException] with root cause
java.lang.NullPointerException
    at org.hibernate.query.criteria.internal.expression.SearchedCaseExpression.lambda$renderProjection$1(SearchedCaseExpression.java:118)
    at org.hibernate.query.criteria.internal.expression.SearchedCaseExpression.render(SearchedCaseExpression.java:141)
    at org.hibernate.query.criteria.internal.expression.SearchedCaseExpression.renderProjection(SearchedCaseExpression.java:116)
    at org.hibernate.query.criteria.internal.expression.CompoundSelectionImpl.render(CompoundSelectionImpl.java:83)
    at org.hibernate.query.criteria.internal.Renderable.renderProjection(Renderable.java:34)
    at org.hibernate.query.criteria.internal.QueryStructure.render(QueryStructure.java:241)
    at org.hibernate.query.criteria.internal.CriteriaQueryImpl.interpret(CriteriaQueryImpl.java:292)
    at org.hibernate.query.criteria.internal.compile.CriteriaCompiler.compile(CriteriaCompiler.java:149)
    at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:3655)
    at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:204)
    at returnitRest.EreturnDAO.fetchEreturns(EreturnDAO.java:1283)
    at returnitRest.EreturnResource.filterEreturn(EreturnResource.java:557)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
...

Есть мысли?