Hibernate: Used mappedBy on class that extends another class annotated as JoinedSubclass?

Question

The following doesn't work:

@Entity
class Owner {

  @OneToMany(mappedBy="owner", cascade = {CascadeType.ALL})
  protected Set<B> getBSet() {
    ..
  }

}

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
class A {
   @ManyToOne
   public Owner getOwner() {
     ...
   }
}

@Entity
class B extends A {

}

It causes an exception as such: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: B.user in Owner.

I am trying to avoid copying the "owner" property into class B (which will consequently "denormalize" and copy the owner key into both tables generated for entity A and B). Also, I would really like to have A and B in a separate table and not have to use a discriminator by using SingleTable inheritance.

Also, I can't figure out how to do something similar by using @OneToOne between A and B (and not having B extend A).

score 10 · Answer 1 · answered Oct 27 '09 at 14:07

10

It's a Hibernate oddity, but it's deliberate. I have a blog post up with background information, links and a workaround for the JOINED solution.

answered Oct 27 '09 at 14:07

Chris Wong

101
1
3

score 6 · Answer 2 · answered Jun 12 '09 at 23:15

6

Try adding targetEntity = Transaction.class. This worked for me when I was using SINGLE_TABLE inheritance. I didn't try it with JOIN.

@Entity
class Owner {

  @OneToMany(mappedBy="owner", cascade = {CascadeType.ALL}, targetEntity = Transaction.class)
  @Where(clause = "tableType='I'")
  protected Set<B> getBSet() {
    ..
  }

}

answered Jun 12 '09 at 23:15

Trevor Allred

888
2
13
22

Works like a charm for me as well (I'm using `InheritanceType.TABLE_PER_CLASS`) – Numbernick Jun 30 '16 at 13:02

score 0 · Answer 3 · answered Jun 08 '09 at 01:58

0

I'd double check your real implementation. I used your sample code and after adding an @Id everything worked as expected. Even IntelliJ says getBSet() is associated with B.owner.

answered Jun 08 '09 at 01:58

danieljimenez

1,390
4
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Did you actually run it and create the Session Factory? Thanks - I'll double check. I didn't use this exact same code - I just pulled from a real example I had that does the same type of thing... – GreenieMeanie Jun 08 '09 at 14:04
Yeah I did run it. That's why I mentioned the @ID. The SF complained about the @id being missing. After that the SF built okay. I could have sworn I typed that exact sentence, hah! Good luck! – danieljimenez Jun 08 '09 at 14:27

Hibernate: Used mappedBy on class that extends another class annotated as JoinedSubclass?

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