OneToOne mapping not working: EntityA.entityB referencing EntityB not mapped to a single property

Hibernate ORM
1

OneToOne mapping not working: EntityA.entityB referencing EntityB not mapped to a single property

I have two entities, EntityA and EntityB.
EntityA has a composite primary key on two fields: id and flag.

EntityB also has a composite primary key on two fields: id and flag.

The two entities are linked with a common field / column: entityBKey. (This is a foreign key but not explicitly defined as such at the database level, if that makes a difference. Old design can’t really change much)

This is how I am calling EntityA:

CriteriaBuilder builder = session.getCriteriaBuilder();
CriteriaQuery<EntityA> criteriaQuery = builder.createQuery(EntityA.class);
Root<EntityA> from = criteriaQuery.from(EntityA.class);
criteriaQuery.select(from);

But I get this error on application boot:

EntityA.entityB referencing EntityB not mapped to a single property
	at org.hibernate.cfg.BinderHelper.createSyntheticPropertyReference(BinderHelper.java:203)
	at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:104)
	at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processEndOfQueue(InFlightMetadataCollectorImpl.java:1750)
	at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processFkSecondPassesInOrder(InFlightMetadataCollectorImpl.java:1694)
	at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1623)
	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:295)
	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:86)
	at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:479)
	at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:85)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:709)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:746)

In some places I have read it says that non-primary keys can be referenced by using the referencedColumnName attribute but it is clearly not working.
Any ideas what I can do here? Much appreciated.

EntityA:

@Entity
@Table(name = "EntityA")
@IdClass(KeyClass.class)
public class EntityA implements Serializable {
    @Id
    @Column(name = "id", nullable = false)
    protected Integer id = null;
    @Id
    @Column(name = "flag", nullable = false)
    protected Integer flag = null;
    @Column(name = "EntityAKey", nullable = false)
    private String entityAKey = null;
    @Column(name = "EntityBKey", nullable = false)
    private String entityBKey = null;

    @OneToOne(mappedBy="entityA")
    private EntityB entityB;

    public EntityA() {
        super();
    }
}

EntityB:

@Entity
@Table(name = "EntityB")
@IdClass(KeyClass.class)
public class EntityB implements Serializable {
    @Id
    @Column(name = "id", nullable = false)
    protected Integer id = null;
    @Id
    @Column(name = "flag", nullable = false)
    protected Integer flag = null;

    @Column(name = "EntityBKey", nullable = false)
    private String entityBKey = null;

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumns({
            @JoinColumn(name = "entityBKey", referencedColumnName = "entityBKey", insertable = false, updatable = false),
            @JoinColumn(name = "flag", referencedColumnName = "flag", insertable = false, updatable = false)}
    )
    @Where(clause = "flag=1")
    private EntityA entityA;

    public EntityB() {
        super();
    }
}

KeyClass:

public class KeyClass implements Serializable {
    private Integer id = null;
    private Integer flag = null;

    public KeyClass() {
    }

    public KeyClass(Integer id, Integer flag) {
        this.id = id;
        this.flag = flag;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getFlag() {
        return flag;
    }

    public void setFlag(Integer flag) {
        this.flag = flag;
    }

    @Override
    public boolean equals(Object o) {
        ...
    }

    @Override
    public int hashCode() {
        ...
    }
}
2

Which Hibernate version are you using? Can you please try updating to the latest and report back again if the problem still persists?

3

We are on 5.6.7.Final. Changed it to 5.6.9.Final, that’s the max we could go to and same result.

4

In that case, please create a JIRA issue along with a reproducer.