Join table with additional state

Question

I have two entities:
A: @Id String acronym;
B: @Id String name;
and I need to create a relationship between these tables adding a new attribute:
@Entity
@SecondaryTables( {
          @SecondaryTable(name = "A", pkJoinColumns = @PrimaryKeyJoinColumn(name = "A_ACRONYM", referencedColumnName = "acronym")),
          @SecondaryTable(name = "B", pkJoinColumns = @PrimaryKeyJoinColumn(name = "B_NAME", referencedColumnName = "name")) })
public class C implements Serializable {
     private static final long serialVersionUID = PujAbstractEntity.serialVersionUID;
     @Id
     @Column(name="acronym")
     private String acronym;
     @Id
     @Column(name="name")
     private String name;
ERROR:
[exec] Exception Description: An incomplete @PrimaryKeyJoinColumns was specified on the annotated element [class com.kenai.puj.arena.model.entity.PujInstitutionRoles]. When specifying @PrimaryKeyJoinColumns for an entity that has a composite primary key, a @PrimaryKeyJoinColumn must be specified for each primary key join column using the @PrimaryKeyJoinColumns. Both the name and the referencedColumnName elements must be specified in each such @PrimaryKeyJoinColumn.
????? any tip ?

Answer 1

Thanks but I am still facing problems...
--------- PujInstitutionEntity:
@Entity
public class PujInstitutionEntity extends PujAbstractRootEntity {
     @Id
     @Column(length = 20)
     private String acronym;
--------- PujCompetitionEntity:
@Entity
public class PujCompetitionEntity extends PujAbstractRootEntity {
     @Id
     @Column(length = 12)
     private String name;
--------- PujInstitutionRoles (the mapping):
@Entity
@IdClass(PujInstitution_Roles_ID.class)
public class PujInstitutionRoles extends PujAbstractEntity {
     @ManyToOne
     @PrimaryKeyJoinColumn(name = "INSTITUTION_ACRONYM", referencedColumnName = "acronym")
     private PujInstitutionEntity institution;
     @ManyToOne
     @PrimaryKeyJoinColumn(name = "COMPETITION_NAME", referencedColumnName = "name")
     private PujCompetitionEntity competition;
---------- The deployment failure:
[exec] Exception Description: Predeployment of PersistenceUnit [arenapuj] failed.
[exec] Internal Exception: Exception [EclipseLink-7150] (Eclipse Persistence Services - 2.0.0.v20091009-r5515): org.eclipse.persistence.exceptions.ValidationException
[exec] Exception Description: Invalid composite primary key specification. The names of the primary key fields or properties in the primary key class [com.kenai.puj.arena.model.entity.PujInstitution_Roles_ID] and those of the entity bean class [class com.kenai.puj.arena.model.entity.PujInstitutionRoles] must correspond and their types must be the same. Also, ensure that you have specified ID elements for the corresponding attributes in XML and/or an @Id on the corresponding fields or properties of the entity class.