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 Post subject: Deleting entities with cylcic reference
PostPosted: Fri Apr 20, 2012 8:29 am 
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Joined: Fri Nov 14, 2008 7:11 am
Posts: 29
I have a mapping with three entity classes that have a cyclic reference:

Code:
class A {
    @OneToMany
    @Cascade (value=CascadeType.ALL)
    B b;
}

class B {
    @OneToOne(optional=false)
    C c
}

class C {
    @OneToOne(optional=false)
    A a;
}


So an A can have many B's which have one C's each. C has a reference to his A.

Now I want to delete an entity of type A with its B's and C's. If I use session.delete(a) the B's get deleted by cascade, but the C's don't. Therefore I have to delete the C's by session.delete(c), but now the cyclic reference is a problem as I cannot delete A (C needs it) and also not C (B needs it). I am getting an PropertyValueException (C.a is referencing a null or transient value).

My solution now is to make the reference from C -> A to optional=true so that I can delete A (with B's by cascade) first and C's at the end.

Is their another solution without making the reference optional (as it is only null within this delete transaction)?

EDIT: Adding a delete cascade from B to C is no possible option in my case.

Thanks in advance,
Olel


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