Bidirectional entity access problem (EJB3)

Question

I made some tests with EJB3 entity beans.
I have simple entity USERS, where is itself (FK-PK) relation PARENT_ID -> USER_ID.
Appropriate part of persistent class Users is:
     @ManyToOne
     @JoinColumn(name = "PARENT_ID", referencedColumnName="USER_ID")
     public Users getUsers() {
          return this.users;
     }end servers side:
     @OneToMany(mappedBy="users", cascade={CascadeType.ALL}, fetch=FetchType.EAGER)
     public Set<Users> getUserses() {
          return this.userses;
     }When I do something, specially call setUser(childInstance) to point the parent instance, on MenyToOne side of association it works.
But when I try to do similar on OneToMany side, like calling:
getUserses().add(childInstance)or
getUserses().remove(childInstance)The changes are only transient and there's not saved into the database.
Although the entity class has bidirectional annotations, it works like unidirectional.
Thanks for some help
KM

Answer 1

In JPA you must always set both sides of the relationship.
See,
[http://en.wikibooks.org/wiki/Java_Persistence/Relationships]
-- James : [http://www.eclipselink.org]