Relation Many-to-Many, liste vide en lecture

Bonjour,

J'ai un petit soucis avec mon mapping. Lorsque je fais la requête de sélection de mon entité A, il me renvoie une liste de mon entité B vide. Pourtant la requête est bien envoyée coté base de donnée.

Mon mapping.

Entité Motor :

Code:

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@Entity
@Table(name = "Motor")
public class Motor extends RefObject {
    private static final long serialVersionUID = -8759210425878668688L;
 
@ManyToMany(fetch=FetchType.LAZY)
    @Cascade(CascadeType.ALL)
    @JoinTable(name = "Study_Motor", joinColumns = @JoinColumn(name="id_motor", referencedColumnName = "id"),
    								 inverseJoinColumns = @JoinColumn(name="id_study", referencedColumnName = "id"))
    private List<Study> studyList;
 
...

Entité Study :

Code:

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@Entity
@Table(name = "Study")
public class Study extends RefObject {
    private static final long serialVersionUID = 6983982151873860807L;
 
@ManyToMany(mappedBy = "studyList", fetch = FetchType.LAZY)
    private List<Motor> motorList;
 
...

Je voudrais donc récupérer la liste des Motor associé a une Study. J'ai testé avec hql et criteria sans succès.

avec Criteria :

Code:

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Criteria criteria = currentSession.createCriteria(Study.class);
		criteria.add(Restrictions.eq("id", study.getId()));
		criteria.setFetchMode("application", FetchMode.JOIN);
                criteria.setFetchMode("motorList", FetchMode.JOIN)

en hql :

Code:

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Query query = currentSession.createQuery("from Study s left join fetch s.application a"
				+ " left join fetch s.motorList m"
				+ " where s.id = :id");
		query.setParameter("id", study.getId());

La requête sql générée me parait correcte, les jointures sont faites correctement (Motor, Motor_Study, Study) :

Code:

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Hibernate: 
    select
        study0_.id as id1_50_0_,
        applicatio1_.id as id1_0_1_,
        motor3_.id as id1_25_2_,
        study0_.reference as referenc2_50_0_,
        study0_.creationDate as creation3_50_0_,
        study0_.creator as creator4_50_0_,
        study0_.application as applicat5_50_0_,
        study0_.gate as gate6_50_0_,
        applicatio1_.reference as referenc2_0_1_,
        applicatio1_.creationDate as creation3_0_1_,
        applicatio1_.creator as creator8_0_1_,
        applicatio1_.applicationType as applicat9_0_1_,
        applicatio1_.customer as custome10_0_1_,
        applicatio1_.cylinder as cylinder4_0_1_,
        applicatio1_.description as descript5_0_1_,
        applicatio1_.fluid as fluid11_0_1_,
        applicatio1_.keyLaboTE as keyLaboT6_0_1_,
        applicatio1_.operation as operatio7_0_1_,
        applicatio1_.pressure as pressur12_0_1_,
        applicatio1_.specification as specifi13_0_1_,
        applicatio1_.technicalInstruction as technic14_0_1_,
        applicatio1_.ventilation as ventila15_0_1_,
        motor3_.reference as referenc2_25_2_,
        motor3_.creationDate as creation3_25_2_,
        motor3_.creator as creator13_25_2_,
        motor3_.maxiCapacitorStart as maxiCapa4_25_2_,
        motor3_.mechanicalLosses as mechanic5_25_2_,
        motor3_.mechanicalLossesInitialization as mechanic6_25_2_,
        motor3_.miniCapacitorStart as miniCapa7_25_2_,
        motor3_.parallelPTCResistor as parallel8_25_2_,
        motor3_.permanentCapacitor as permanen9_25_2_,
        motor3_.prototypeReference as prototy10_25_2_,
        motor3_.rotor as rotor14_25_2_,
        motor3_.serialPTCResistor as serialP11_25_2_,
        motor3_.serialReference as serialR12_25_2_,
        motor3_.stator as stator15_25_2_,
        motor3_.voltage1 as voltage16_25_2_,
        motor3_.voltage2 as voltage17_25_2_,
        motorlist2_.id_study as id_study2_50_0__,
        motorlist2_.id_motor as id_motor1_52_0__ 
    from
        Study study0_ 
    left outer join
        Application applicatio1_ 
            on study0_.application=applicatio1_.id 
    left outer join
        Study_Motor motorlist2_ 
            on study0_.id=motorlist2_.id_study 
    left outer join
        Motor motor3_ 
            on motorlist2_.id_motor=motor3_.id 
    where
        study0_.id=?

Ma liste de motor reste vide, si vous pouviez me donner une idée ce serai cool !
Merci