JPA native query returns no records

Question

This is method to get Module entites within specified level for related backend.

public List<Module> getModulesWithinLevel(Long backendId, ModuleLevel... levels) {
        String joinedLevels = serializeLevels(levels);
        Query query = entityManager.createNativeQuery("SELECT DISTINCT M.* FROM MODULES M JOIN ROUTING_SEQUENCES RS ON RS.BCK_ID = M.MOD_ID WHERE M.MOD_LEVEL IN (?) AND RS.BCK_ID = ?", Module.class);
        query.setParameter(1, joinedLevels);
        query.setParameter(2, backendId);
        List l = query.getResultList();
        return l;
    }

When i execute the exact query in sql developer i get one row as result. But this method returns empty List. No errors in logs - just empty list. What is wrong with my native query?

Answer 1

I did found answer to the original question but i did a little workaround by implementing entity for the ROUTING_SEQUENCES table with composite key. This works well:

Query query = entityManager.createQuery("SELECT m FROM Module m WHERE m.id IN (SELECT rs.id.moduleId FROM RoutingSequence rs WHERE rs.id.backendId = :backendId) AND m.level IN (:levels)", Module.class);
query.setParameter("backendId", backendId);
query.setParameter("levels", Arrays.asList(levels));
return query.getResultList();

Entity:

@Entity
@Table(name = "ROUTING_SEQUENCES")
public class RoutingSequence extends AbstractEntity<RoutingSequencePK> implements Auditable {

    @EmbeddedId
    private RoutingSequencePK id;

    @Column(name = "RS_MANDATORY", nullable = false)
    private Boolean mandatory;

    @Column(name = "RS_ORDER")
    private int order;

    @Column(name = "RS_INSDTTM")
    private Date insertDate;

    @Column(name = "RS_UPDDTTM")
    private Date updateDate;
...
}

Id

@Embeddable
public class RoutingSequencePK implements Serializable {

    @Column(name = "BCK_ID")
    private Long backendId;

    @Column(name = "MOD_ID")
    private Long moduleId;

Answer 2

Did you leave the ? in there by mistake?

Try...

Query query = entityManager.createNativeQuery("SELECT DISTINCT M.* FROM MODULES M JOIN ROUTING_SEQUENCES RS ON RS.BCK_ID = M.MOD_ID WHERE M.MOD_LEVEL IN (:1) AND RS.BCK_ID = :2", Module.class);