A Foreign key refering has wrong number of columns - jpa

Question

I got a problem with JPA and ManyToMany association.
I got two class FOA_PARAM_EMPLOYE and FOA_PARAM_POSITION, and an association table FOA_PARAM_EMPLOYE_POSITION.
Class FoaParamEmploye :
#Entity
#Table(name = "FOA_PARAM_EMPLOYE")
#NamedQuery(name = "FoaParamEmploye.findAll", query = "SELECT f FROM FoaParamEmploye f")
public class FoaParamEmploye implements Serializable {
private static final long serialVersionUID = 1L;
#EmbeddedId
private FoaParamEmployePK id;
#Column(name = "ACTEUR_MAJ_OCCUR")
private String acteurMajOccur;
#Column(name = "ADRESSE_EMAIL")
private String adresseEmail;
// bi-directional many-to-many association to FoaParamPosition
#ManyToMany
#JoinTable(
name = "FOA_PARAM_EMPLOYE_POSITION",
joinColumns = { #JoinColumn(name = "ID_EMPLOYE"),
#JoinColumn(name = "COD_ENTREP") },
inverseJoinColumns = { #JoinColumn(name = "ID_POSITION")
})
private List<FoaParamPosition> foaParamPositions;
public FoaParamEmployePK getId() {
return this.id;
}
public void setId(FoaParamEmployePK id) {
this.id = id;
}
public String getActeurMajOccur() {
return this.acteurMajOccur;
}
public void setActeurMajOccur(String acteurMajOccur) {
this.acteurMajOccur = acteurMajOccur;
}
public String getAdresseEmail() {
return this.adresseEmail;
}
public void setAdresseEmail(String adresseEmail) {
this.adresseEmail = adresseEmail;
}
public List<FoaParamPosition> getFoaParamPositions() {
return foaParamPositions;
}
public void setFoaParamPositions(List<FoaParamPosition> pFoaParamPositions) {
this.foaParamPositions = pFoaParamPositions;
}
}
Class FoaParamPosition :
#Entity
#Table(name="FOA_PARAM_POSITION")
#NamedQuery(name="FoaParamPosition.findAll", query="SELECT f FROM FoaParamPosition f")
public class FoaParamPosition implements Serializable {
private static final long serialVersionUID = 1L;
#EmbeddedId
private FoaParamPositionPK id;
#Column(name="ACTEUR_MAJ_OCCUR")
private String acteurMajOccur;
#Column(name="CD_PROFIL_AFFECTATION")
private String cdProfilAffectation;
// bi-directional many-to-many association to FoaParamEmploye
#ManyToMany
private List<FoaParamEmploye> foaParamEmployes;
public FoaParamPositionPK getId() {
return this.id;
}
public void setId(FoaParamPositionPK id) {
this.id = id;
}
public String getActeurMajOccur() {
return this.acteurMajOccur;
}
public void setActeurMajOccur(String acteurMajOccur) {
this.acteurMajOccur = acteurMajOccur;
}
public String getCdProfilAffectation() {
return this.cdProfilAffectation;
}
public void setCdProfilAffectation(String cdProfilAffectation) {
this.cdProfilAffectation = cdProfilAffectation;
}
public List<FoaParamEmploye> getFoaParamEmployes() {
return foaParamEmployes;
}
public void setFoaParamEmployes(List<FoaParamEmploye> pFoaParamEmployes) {
this.foaParamEmployes = pFoaParamEmployes;
}
}
Table FOA_PARAM_EMPLOYE_POSITION has this columns :
COD_ENTREP
ID_EMPLOYE
ID_POSITION
XQCIF
ACTEUR_MAJ_OCCUR
DATE_HEURE_MAJ_OCCUR
I got this exception :
A Foreign key refering com.groupama.middlgan.entities.FoaParamPosition from
com.groupama.middlgan.entities.FoaParamEmploye has the wrong number of column.
should be 2
If I add COD_ENTREP on inverseJoinColumns in my FoaParamEmploye entity, I got this exception :
Repeated column in mapping for collection:
com.groupama.middlgan.entities.FoaParamEmploye.foaParamPositions column: COD_ENTREP
Any idee ?

Answer 1

[I am assuming you are listing the columns for the association table FOA_PARAM_EMPLOYE_POSITION, not FOA_PARAM_EMPLOYE, as you state in your question.]
Your mappings imply FOA_PARAM_EMPLOYE_POSITION.COD_ENTREP is part of two foreign keys, one referencing FOA_PARAM_EMPLOYE and one referencing FOA_PARAM_POSITION. In practice these two foreign keys might contain the same value for COD_ENTREP, but this cannot be enforced by the database or JPA.
You should probably model the relationship differently, possibly add another, container-like, object that has bi-directional one-to-many relationships with both FoaParamEmploye and FoaParamPosition and shares parts of its primary key with the other two primary keys.

Answer 2

If you want to keep your inverseJoinColumn mapping you can do as follows,
#ManyToMany
#JoinTable(
name = "FOA_PARAM_EMPLOYE_POSITION",
joinColumns = { #JoinColumn(name = "ID_EMPLOYE"),
#JoinColumn(name = "COD_ENTREP") }
,
inverseJoinColumns = {#JoinColumn(name = "FOAPARAMPOSITION_COD_ENTREP"), #JoinColumn(name = "FOAPARAMPOSITION_ID_POSITION")}
)
private List<FoaParamPosition> foaParamPosition;
and
#ManyToMany
#JoinTable(
name = "FOA_PARAM_EMPLOYE_POSITION",
joinColumns = { #JoinColumn(name = "ID_POSITION"),
#JoinColumn(name = "COD_ENTREP") }
,
inverseJoinColumns = {#JoinColumn(name = "FOAPARAMEMPLOYE_COD_ENTREP"), #JoinColumn(name = "FOAPARAMEMPLOYE_ID_EMPLOYE")}
)
private List<FoaParamEmploye> foaParamEmploye;
the mappings are aligned with the code you've posted in your other question JPA Many To Many Select