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@OneToOne annotation within composite key class is not working.

Answer 1

A:

I wasn't aware this was possible but, according to the Hibernate Annotation reference documentation, it is (this is Hibernate specific though):

2.2.3.2.1. @EmbeddedId property

(...)

While not supported in JPA, Hibernate lets you place your association directly in the embedded id component (instead of having to use the @MapsId annotation).

@Entity
class Customer {
  @EmbeddedId CustomerId id;
  boolean preferredCustomer;
}

@Embeddable
class CustomerId implements Serializable {
  @OneToOne
  @JoinColumns({
    @JoinColumn(name="userfirstname_fk", referencedColumnName="firstName"),
    @JoinColumn(name="userlastname_fk", referencedColumnName="lastName")
  }) 
  User user;
  String customerNumber;
}

@Entity 
class User {
  @EmbeddedId UserId id;
  Integer age;
}

@Embeddable
class UserId implements Serializable {
  String firstName;
  String lastName;
}

And with the code you provided, the following snippet just works for me:

LinkedTable linkedTable = new LinkedTable();
linkedTable.setId(1l);
session.persist(linkedTable);
session.flush();

Test.TestId testId = new Test.TestId();
testId.setLinkedTable(linkedTable);
Test test = new Test();
test.setId(testId);
session.persist(test);
session.flush();

Tested with Hibernate EM 3.4.0.GA, Hibernate Annotations 3.4.0.GA and Hibernate Core 3.3.0.SP1.

If it doesn't work for you, can you provide a bit more code allowing to reproduce the problem?

Pascal Thivent 2010-07-16 20:54:51

Dear Pascal, thanks for the answer. I have checked it with the Hibernate only version and indeed it works. For now, I don't know what is exactly causes the problem. I use Hibernate + JPA couple and I think that problem is JPA then. I am gonna check it.

Graffinych 2010-07-19 11:07:42

@Graffinych: Well, as I wrote, I tested this with Hibernate Entity Manager (i.e. Hibernate + JPA).

Pascal Thivent 2010-07-19 11:58:49

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@OneToOne annotation within composite key class is not working.

2.2.3.2.1. @EmbeddedId property

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