JPA Eclipselink Subquery in where子句，CriteriaBuilder和metamodel

Clases

SELECT * FROM clases cl 
WHERE CURRENT_TIME() BETWEEN
(SELECT ml2.inicio FROM modulos ml2 WHERE cl.modulo_id=ml2.modulo_id ) AND 
(SELECT ml2.fin FROM modulos ml2 WHERE cl.modulo_id=ml2.modulo_id) AND
 cl.fecha=CURRENT_DATE();

@Entity
@Table(name = "modulos")
public class Modulos implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "modulo_id")
    private Integer moduloId;

    @Basic(optional = false)
    @Column(name = "inicio")
    @Temporal(TemporalType.TIME)
    private Date inicio;

    @Basic(optional = false)
    @Column(name = "fin")
    @Temporal(TemporalType.TIME)
    private Date fin;

    @Basic(optional = false)
    @Column(name = "modulo")
    private String modulo;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "modulos")
    private List<GruposHorarioHasModulos> gruposHorarioHasModulosList;

    //getters and setters...
}

@Entity
@Table(name = "clases")
public class Clases implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "clase_id")
    private Integer claseId;

    @Basic(optional = false)
    @Column(name = "aula")
    private String aula;

    @Basic(optional = false)
    @Column(name = "fusion")
    private boolean fusion = false;

    @Basic(optional = false)
    @Column(name = "clase_numero")
    private Integer claseNumero;

    @Basic(optional = false)
    @Column(name = "clase_impartida")
    private boolean claseImpartida = false;

    @JoinColumn(name = "modulo_id", referencedColumnName = "modulo_id")
    @ManyToOne(optional = false)
    private Modulos modulos;

    //getters and setters...
}

EntityManager em1 = Persistence.createEntityManagerFactory("myPU").createEntityManager();
CriteriaBuilder cb = em1.getCriteriaBuilder();
CriteriaQuery cq = cb.createQuery();
Root<Clases> root = cq.from(Clases.class);
cq.select(root.get(Clases_.claseId));

Subquery<Date> sqOne = cq.subquery(Date.class);
Root<Modulos> root2 = sqOne.from(Modulos.class);
sqOne.select(root2.get(Modulos_.inicio));

Subquery<Date> horaInicio = sqOne.select(root2.get(Modulos_.inicio)).where(
        cb.equal(
            root2.get(Modulos_.moduloId),
            root.get(Clases_.modulos).get(Modulos_.moduloId)
            )
        );

Subquery<Date> sqTwo = cq.subquery(Date.class);
Root<Modulos> root3 = sqTwo.from(Modulos.class);
Subquery<Date> horaFin = sqTwo.select(root3.get(Modulos_.fin)).where(
        cb.equal(
            root3.get(Modulos_.moduloId),
            root.get(Clases_.modulos).get(Modulos_.moduloId)
            )
        );

cq.where(cb.between(cb.currentTime(), horaInicio, horaFin));
em1.createQuery(cq).getResultList();

where

cq.where(cb.between(cb.currentTime(), new Date(), new Date()));

where

cq.where(cb.greaterThan(cb.currentTime(), horaInicio));

SELECT t0.clase_id FROM clases t0, clases t1 WHERE (CURRENT_TIME > (SELECT t2.inicio FROM modulos t3, modulos t2 WHERE ((t2.modulo_id = t3.modulo_id) AND (t3.modulo_id = t0.modulo_id))))

where

where

between

SELECT * FROM X WHERE CURRENT_TIME BETWEEN **MY_SUBQUERY_ONE** AND **MY_SUBQUERY_TWO**