Criteria JPA 2 with 3 tables

Question

I\'m trying to create a criteria to retrieve some objects from 3 tables (Associate, Update and Detail). A Detail has reference to Associate and Update, and an Update has ref

Answer 1

Checkout this test with even more than three tables . Also use static meta model instead of using direct attribute names.

    @Test
@Rollback(false)
@Transactional
public void   
fetch() {
    CriteriaBuilder cb = 
entityManager.getCriteriaBuilder();
    CriteriaQuery cq = 
cb.createQuery(Instructor.class);
    Root root = 
cq.from(Instructor.class);
    root.join(Instructor_.idProof);
    root.join(Instructor_.vehicles);
    Join insStuJoin = 
root.join(Instructor_.students);
    insStuJoin.join(Student_.instructors);
    Join stuVehcileJoin.   
= insStuJoin.join(Student_.vehicles);
    Join 
vehicleDocumentJoin = 
stuVehcileJoin.join(Vehicle_.documents);

DataPrinters.
listDataPrinter.accept.   
(queryExecutor.fetchListForCriteriaQuery
      (cq.select(root).where
(cb.greaterThan(root.get(Instructor_.id), 2),                        
           cb.in(vehicleDocumentJoin.get
                          (Document_.name)).value("1")
.value("2").value("3")));
}