I have a requirement to have a compound key for my database schema.

Below is my compound key:

@Embeddable
public class CompoundPK implements Serializable {

@Column(name="REGION_ID")
private long regionId;

private long id;

//omitted constructors, getters, setters for brevity.
}

My entity hierarchy is below
@Entity
@Table(name="table1")
@Inheritance(strategy=InheritanceType.JOINED)
public abstract class NamedEntity{
@EmbeddedId
protected CompoundPK id;

@Column(name="LAST_NAME")
protected String lastName;

}

@Entity
@Table(name="table2")
public class Person extends NamedEntity{

@Column(name = "DATE_OF_BIRTH)
private Date dob;

....

}

However I'm unable to use the compound primary key. Is this a Hibernate limitation, where compound keys can't be used in Inheritance?

Thanks in advance