JPA. How do I subclass existing entity and keep its ID?

Question

Assume I have two classic non-abstract JPA classes: Person and Student.

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Person {
  @Id
  @Ge         


        

Answer 1

As far as I know, there are no good ways to achieve it.

It would be much simplier if you model this situation as a Person that can have multiple roles Roles (one-to-many relationship), where Student is one of them (i.e. Student extends Role).