@OneToMany, detached adding an object to the list -> org.hibernate.TransientObjectException

[Markus Schmider]

I have a class A which has a

List<B>

.

@OneToMany(fetch=FetchType.EAGER)
@JoinColumn(name="b_fk")
private List<B> bs = new ArrayList<B>();

I use it in an web application, so A becomes detached. The User can add B instances to A.
When I try to merge A which reference a new B instance I get

Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: B

Is this the expected behavior for JPA 2.0?

Do I have to write code to save B before saving A or this there some way to automate this with the right mapping annotations?

Thanks,

Hans

[Markus Schmider]

Ok I have found out for myself:

You have to add a CascadeType

@OneToMany(fetch=FetchType.EAGER, cascade=CascadeType.ALL)