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 Post subject: JPA Criteria query double joins and hibernate error with-cla
PostPosted: Tue May 17, 2016 2:14 pm 

Joined: Tue May 17, 2016 2:04 pm
Posts: 1
I need to join two tables (SQL):
FROM device d
LEFT OUTER JOIN installation_record ir1 ON (d.id = ir1.device)
LEFT OUTER JOIN installation_record ir2 ON (d.id = ir2.device AND ir1.install_date < ir2.install_date)
WHERE ir2.id IS NULL AND ir1.uninstall_date IS NULL;

Based on which a created a criteria query:

final CriteriaBuilder cb = em.getCriteriaBuilder();
final CriteriaQuery<Device> cq = cb.createQuery(Device.class);
final Root<Device> root = cq.from(Device.class);
final Join<Device, InstallationRecord> join1 = root.join(Device_.installationRecordList, JoinType.LEFT);
final Join<Device, InstallationRecord> join2 = root.join(Device_.installationRecordList, JoinType.LEFT);

join2.on(cb.lessThan(join1.get(InstallationRecord_.installDate), join2.get(InstallationRecord_.installDate)));

final List<Predicate> predicates = Lists.newArrayList();
cq.where(predicates.toArray(new Predicate[] {}));

return em.createQuery(cq).getResultList();

This gives me the following exception: org.hibernate.hql.internal.ast.QuerySyntaxException: with-clause referenced two different from-clause elements

The HQL that was generated (from error message) seems equivalent to the SQL above:
SELECT generatedAlias0 FROM Device AS generatedAlias0
LEFT JOIN generatedAlias0.installationRecordList AS generatedAlias1
LEFT JOIN generatedAlias0.installationRecordList AS generatedAlias2
WITH generatedAlias1.installDate<generatedAlias2.installDate
WHERE ( generatedAlias2.id IS NULL ) AND ( generatedAlias1.uninstallDate IS NULL )

Can anyone help me join the tables and get rid of the error?

Thanks in advance, Miha

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