How to convert my native SQL query into a JPQL query

Question

I'm trying to convert a native SQL query into a JPQL query. Presented first are the JPA entities and the repository interface:

LearnerActivity

@Entity
@Table(name = "learner_activity")
public class LearnerActivity implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @ManyToMany
    @JoinTable(name = "learner_activity_unit",
               joinColumns = @JoinColumn(name="learner_activitys_id", referencedColumnName="ID"),
               inverseJoinColumns = @JoinColumn(name="units_id", referencedColumnName="ID"))
    private Set<Unit> units = new HashSet<>();

    @ManyToMany
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    @JoinTable(name = "learner_activity_performance_criteria",
               joinColumns = @JoinColumn(name="learner_activitys_id", referencedColumnName="ID"),
               inverseJoinColumns = @JoinColumn(name="performance_criterias_id", referencedColumnName="ID"))
    private Set<PerformanceCriteria> performanceCriterias = new HashSet<>();
}

LearnerJobOnSiteChecklistSectionItem

@Entity
@Table(name = "learner_job_on_site_checklist_section_item")
public class LearnerJobOnSiteChecklistSectionItem implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @ManyToOne
    @JoinColumn(name = "learner_activity_id")
    private LearnerActivity learnerActivity;
}

LearnerPortfolioPerformanceCriteriaAchievement

@Entity
@Table(name = "learner_portfolio_performance_criteria_achievement")
public class LearnerPortfolioPerformanceCriteriaAchievement implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @ManyToOne
    @JoinColumn(name = "performance_criteria_id")
    private PerformanceCriteria performanceCriteria;

    @ManyToMany
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    @JoinTable(name = "learner_portfolio_performance_criteria_achievement_learner_job_on_site_checklist_section_item",
               joinColumns = @JoinColumn(name="learner_portfolio_performance_criteria_achievements_id", referencedColumnName="ID"),
               inverseJoinColumns = @JoinColumn(name="learner_job_on_site_checklist_section_items_id", referencedColumnName="ID"))
    private Set<LearnerJobOnSiteChecklistSectionItem> learnerJobOnSiteChecklistSectionItems = new HashSet<>();
}

I'm looking to get all LearnerPortfolioPerformanceCriteriaAchievements which have the same PerformanceCriteria as a given LearnerJobOnSiteChecklistSectionItem's Activity.

LearnerPortfolioPerformanceCriteriaAchievementRepository

public interface LearnerPortfolioPerformanceCriteriaAchievementRepository extends JpaRepository<LearnerPortfolioPerformanceCriteriaAchievement,Long> {
    @Query("select distinct lppca from LearnerJobOnSiteChecklistSectionItem si inner join si.learnerActivity la inner join LearnerPortfolioPerformanceCriteriaAchievement lppca where lppca.performanceCriteria member of la.performanceCriterias and si.id =:sectionItemId")
    public List<LearnerPortfolioPerformanceCriteriaAchievement> findForSectionItem(@Param("sectionItemId") Long sectionItemId);
}

Native SQL

SELECT
  a.id
FROM
  learner_job_on_site_checklist_section_item AS i
JOIN
  learner_activity_performance_criteria AS c
ON
  c.learned_activitys_id = i.learned_activitys_id
INNER JOIN
  learner_portfolio_performance_criteria_achievement AS a
ON
  a.performance_criteria_id = c.performance_criterias_id
where i.id = 2

Understanding that I can replace my SQL ON with WHERE clauses, my best JPQL attempt so far is this:

SELECT
  DISTINCT lppca
FROM
  LearnerJobOnSiteChecklistSectionItem si
INNER JOIN
  si.learnerActivity la
INNER JOIN
  LearnerPortfolioPerformanceCriteriaAchievement lppca
WHERE
  lppca.performanceCriteria MEMBER OF la.performanceCriterias
AND si.id =:sectionItemId

However, running this JPQL throws the following exception:

Caused by: java.lang.IllegalStateException: No data type for node: org.hibernate.hql.internal.ast.tree.IdentNode 
 \-[IDENT] IdentNode: 'lppca' {originalText=lppca}

Answer 1

The following query will work:

SELECT
  a
FROM
  LearnerPortfolioPerformanceCriteriaAchievement  a
  , LearnerActivity                               v
  , LearnerJobOnSiteChecklistSectionItem          i
WHERE
  i.id                                            = :sectionItemId
AND i.learnerActivity                             = v
AND a.performanceCriteria                         MEMBER OF v.performanceCriterias
AND i                                             MEMBER OF a.learnerJobOnSiteChecklistSectionItems

Have created a sample application to test the query (I have used shorter and simpler class names to make it easy to read).