placement of mappedBy in a OneToOne relationship in Java Hibernate/JPA

Question

If we have two classes X and Y that have OneToOne relationship between them

class A {
  @OneToOne(mappedBy = a)
  private B b;
}
class B {
  @OneToOne
  private A a;
}

I would like to know if it makes any difference if we method the mappedBy from Class A to Class B..

Take a look here https://stackoverflow.com/questions/9108224/can-someone-explain-mappedby-in-jpa-and-hibernate — Skyterix, Dec 31 '21 at 23:28
Your question is unclear. what do you mean `if we method the mappedBy from Class A to Class B` — Faheem azaz Bhanej, Jan 01 '22 at 06:49

score 1 · Answer 1 · answered Dec 31 '21 at 23:42

When you both entities (A and B) you can choose one that will have a foreign key.

In your example, the foreign key will be in B, referencing A.

But in A, you want referencing B. So, you say to the JPA: I have this class A with a relationship with B, but it was created in B. So mappedBy is just a reverse reference to get B in this relationship.

@OneToOne(mappedBy = "a")

placement of mappedBy in a OneToOne relationship in Java Hibernate/JPA

1 Answers1