PK in aggregated entity with other non-key attributes?

[Shannon McGee]

Is it possible to push the PK down into an aggregated entity that contains other non-key attributes?

@IdClass and @EmbeddedId allow you to define a PK (or composite key) in an aggregated entity.


But is it possible to map something like:

@Entity
public class Car {
@Embedded // or another annotation???
private CarInfo info;
@Column(name="name")
private String name;
//...
}

@Embeddable
public class CarInfo {
@Id
private Integer id;
@Column
private String make;
@Column
private String model;
//...
}

And yes, I know this is just a bad idea

Thanks!
Shannon

[James Sutherland]

The JPA spec does not allow this, but some providers may support it.

If using EclipseLink you can use the @PrimaryKey annotation to define your primary key to any desired columns, no matter how they are mapped.

Probably best to mirror the id field in the entity.