Hibernate 5/JPA 2.0 junit 使用 H2mem 数据库进行测试，使用 JPQL 查询没有返回结果

Question

当我使用 H2mem 数据库在我的 JPA 2.0/Hibernate 5 应用程序中运行 junit 测试时，它成功地返回本机查询的结果，但不返回 JPQL 查询的结果？

坚持：

DepMgr.getEntityManager().getTransaction().begin();
log.info("Start dataFactory transaction");
for (int i = 5; i <= NROFREPORTS; i++) {
  Report report = new Report();
  Bunker bunker = bunkers.get(i);
  report = readFromExcelSheet(fileName);
  report.addBunker(bunker);
  reports.add(report);
  DepMgr.getEntityManager().persist(report);
}
DepMgr.getEntityManager().getTransaction().commit();

成功检索本机查询

    Query query = DepMgr.getEntityManager()
            .createNativeQuery("select * from voyage_reports where vessel in (:vessel)", VoyageReport.class);
    query.setParameter("vessel", vessel);
    return (List<VoyageReport>) query.getResultList();

JPQL 查询返回空列表而没有错误

    String hql = "SELECT v FROM VoyageReport v WHERE v.vessel = :vessel ORDER BY v.vessel";
    Query query = DepMgr.getEntityManager().createQuery(hql, VoyageReport.class);
    query.setParameter("vessel", vessel);
    return (List<VoyageReport>) query.getResultList();

Hibernate sql output 为原生

Hibernate: 
    select
        * 
    from
        voyage_reports 
    where
        vessel in (
            ?
        )

Hibernate sql output 用于JPQL

Hibernate: 
    select
        repo0_.id as id1_9_0_,
        moreFields...
  from
        voyage_reports repo0_ 
    where
        repo0_.vessel in (
            ?,?,?,?
        ) 
        and repo0_.vessel=? 
    order by
        repo0_.vessel

为什么原生查询返回结果而 JPQL 失败？