Question

I have the following JPA entities

Module class with the following attributes

• Identifier
• String name
• String code
• Person manager

Person class with the following attributes

• Identifier
• String name
• String title
• Person supervisor
• Module module

Now I need to create the following relationships for Person

• A many-to-one relationship to its supervising person
• A many-to-one relationship to its module

I have no idea how to create the relationships in its own class (Person -> Person).

Any suggestions would be welcome. Thx

Answer 1

You do it exactly as if you had two entities of different classes:

@Entity
public class Person {
    @ManyToOne
    Person supervisor;
    ...
}

If you want it bidirectional, then you also do it exactly as if you had two entities of different classes:

@Entity
public class Person {
    @ManyToOne
    Person supervisor;

    @OneToMany(mappedBy = "supervisor")
    Set<Person> supervised;
}