Hibernate Hazelcast Second Level Cache With @MapsId not working

Hibernate ORM
1

I have been trying to cache an entity in hibernate hazelcast. This entity is dependent on another entity. I have tried the mapping in the following ways. The first one caches after first em.find but the second one doesn’t.

@Entity
@Table(name = "config")
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.READ_WRITE, region = "hibernate-average-config")
public class Config implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(generator = "foreignIdGenerator")
    @GenericGenerator(
            name = "foreignIdGenerator", strategy = "foreign",
            parameters = @Parameter(name = "property", value = "provider"))
    private int id;

    @Fetch(SELECT)
    @OneToOne(optional = false)
    @JoinColumn(name = "prov_id", nullable = false, updatable = false, unique = true)
    private Provider provider;

This above snippet works but the following does not

@Entity
@Table(name = "config")
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.READ_WRITE, region = "hibernate-average-config")
public class Config implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @MapsId
    @Fetch(SELECT)
    @OneToOne(optional = false)
    @JoinColumn(name = "prov_id", unique = true, nullable = false, updatable = false)
    private Provider provider;