Using @Embedded in @Embeddable class

Question

Can I use @Embedded in @Embeddable class in hibernate.

Example : A is an element collection in a diffirent class.

@Embeddable
class A {

    @Embedded
    B b;
}

@Embeddable
class B {

    @Embedded
    C c;
}


@Embeddable
class C {

    @Embedded
    D D;
}

@Embeddable
class D {



}

Is something of this kind valid in hibernate ? The third level of nesting.

Answer 1

Yes, it is valid in Hibernate to nest @Embedded objects.

Directly from the docs (http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/#d0e714) :

@Entity
public class Person {

    @Embedded
    Address homeAddress;
}          

@Embeddable
public class Address {

    @Embedded
    Country nationality;
}            

@Embeddable
public class Country {
    ...
}    

(Removed extra code to highlight nesting @Embedded)

Answer 2

As mentioned by johncarl, it is possible. In order to rename nested attributes you have to specify the entire chain, using '.' as separator. For example, if class D has an attribute foo, then in class A you would need to rename it as such:

@Embedded
@AttributeOverride(name = "c.D.foo", column = @Column(name = "bar"))
B b;