I have two entities:
Parent {
Child[] children;
}
and
Child {
Parent parent;
}
I'm aware about @JsonBackReference
and @JsonManagedReference
.
They are good, if I'm serializing instances of Parent
.
But I also need to transfer instances of Child
and I want to have the parent
field populated.
In other words:
- On serialization of
Parent
it should havechildren
but their parent field might be empty (can be solved by using json reference annotations). - On serialization of
Child
it should haveparent
with theirchildren
(butchildren
don't have to haveparent
populated.
Is there a way to solve it using standard Jackson capabilities?
I.e. skip serialization of entities which were already serialized instead of marking fields eligible or non-eligible for serialization.
Jackson 2.0 does support full cyclic object references. See "Jackson 2.0 released" (section 'Handle Any Object Graphs, even Cyclic ones!') for an example.
Basically, you will need to use new
@JsonIdentityInfo
for types that require id/idref style handling. In your case this would be bothParent
andChild
types (if one extends the other, just add it to super type and that's fine).very handy interface implementation is provided in jackson 2 library as
in maven
@StaxMan provided a nice link to start from