@Entity
public class Company {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private Factory factory;
}

@Entity
public class Factory {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    private CarFactory carFactory;
}

public class CarFactory {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToMany(mappedBy = "carFactory", cascade = CascadeType.ALL, orphanRemoval = true)
    Set<Car> cars = new HashSet<>();
}

@Entity
public class Car {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToMany(mappedBy = "car", cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
    private Set<Feature> features = new HashSet<>();

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private CarFactory carFactory;

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private Info info;
}

@Entity
public class Feature {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    private Car car;

    @OneToOne(fetch = FetchType.LAZY)
    private Factory factory;
}

@Entity
public class Info {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
}

    @Query("select c from Company c where c.id = :id")
    @EntityGraph(attributePaths = {"factory", "factory.carFactory", "factory.carFactory.cars",
            "factory.carFactory.cars.features","factory.carFactory.cars.info"
    })
    Optional<Company> findByIdCustomEntityGraph(long id);

    @Transactional(readOnly = true)
    public Company getFetchGraphHint(long id) {
        var companyGraph = entityManager.createEntityGraph(Company.class);
        var factoryGraph = companyGraph.addSubgraph("factory");
        var carFactoryGraph = factoryGraph.addSubgraph("carFactory");
        var carsGraph = carFactoryGraph.addSubgraph("cars");
        carsGraph.addAttributeNodes("features", "info");
        return entityManager.createQuery("select c from Company c where c.id = :id", Company.class)
                .setParameter("id", id)
                .setHint(SpecHints.HINT_SPEC_FETCH_GRAPH, companyGraph)
                .getSingleResult();
    }