Cause you arent managed...do the whole method in an ejb (with a transaction)
Le 18 oct. 2013 19:30, "José Luis Cetina" <[email protected]> a écrit :
> Ok, in the example i tried to set the list in the ejb, but if removed and
> then put the list in the managed bean i get the same behavior
>
>
> @Named
> public class MyBean implements Serializable{
>
> @EJB
> private MyEJB ejb;
>
> public void anyMethod(){
> User user = ejb.getUserWithRoles();
> //i will create a list of role just for try to set any role the
> userJohn
> List<Role> roleList = new ArrayList<Role>(2);
> roleList.add(new Role(1,'ADMIN'); //creating and adding role 1
> roleList.add(new Role(2,'DEVELOPER');//creating and adding role 2
>
> //setting the list of roles created to the user, as you can see the
> list has 2 values but the value roles of userJohn always is set to null, my
> setters and getters are correct
> user.setRoles(roleList);
>
> user.getRoles(); //<---- HERE THE LIST IS ALWAYS NULL
> }
>
> }
>
>
>
>
> I dont want these roles get persisted i just want to modify my object, is
> still the same even setting the value in the maged bean?
>
>
>
> 2013/10/18 Romain Manni-Bucau <[email protected]>
>
> > Hi
> >
> > Your entity is not managed so you cant do it. It is normal.
> > Le 18 oct. 2013 19:09, "José Luis Cetina" <[email protected]> a
> écrit :
> >
> > > I sent this mail to openJPA mailing list but i dont know if this could
> be
> > > something related to TomEE or just im doing something wrong.
> > >
> > >
> > > I have a "strange" behavior, with list properties of any kind of
> entity.
> > >
> > > When i try to set a non empty list to a retrieved entity that has a
> list
> > > value with null (because is not fetched) the entity doesnt "reflect"
> the
> > > new non-empty values that i set.
> > >
> > > Steps
> > > 1. Retrieve any entity (ex. user) from database in an ejb with
> criterias.
> > > 2. The retrieved entity has a OneToMany attribute (roles) by default is
> > > lazy thats why if i dont do a fetch (i dont) the list is null
> > > 3. Then try to fill the role list with a NON-EMPTY list
> > > 4. Here the list that i set has values but the user list has a null in
> > the
> > > roles list attribute even though i set it in the step 3
> > >
> > >
> > > I dont know why this is happening, the only way i could fix this is
> > cloning
> > > (using SerializationUtils from Apache commons.lang3) the user entity
> (see
> > > the steps) and with this work, but i dont know why.
> > >
> > > 1. Retrieve any entity (ex. user) from database in an ejb with
> criterias.
> > > 2. Clone retrieved entity and asig to new one User clonedUser =
> > > SerializationUtils.clone(originalRetrivedUser);
> > > 3. Then try to fill the role list with a NON-EMPTY list to the
> clonedUser
> > > 4. The list of clonedUser has the correct values
> > >
> > >
> > > Why i need to clone? why i cannot set a list to the entity if is not
> > > cloned?
> > >
> > >
> > > Im using Apache TomEE 1.6.0-SNAPSHOT (with the openjpa version
> embedded)
> > >
> > >
> > > Scenario:
> > >
> > > ***** ENTITIES *****
> > > @Entity
> > > public class User implements Serializable{
> > >
> > > @Id
> > > private int id;
> > > private String userName;
> > > private String password;
> > > @OneToMany(mappedBy = "user")
> > > private List<Role> roles;
> > >
> > > //getters and setters..
> > >
> > > }
> > >
> > >
> > > @Entity
> > > public class Role implements Serializable{
> > >
> > > @Id
> > > private int id;
> > > private String roleName;
> > > @ManyToOne
> > > @JoinColumn(name = "user_id")
> > > private User user;
> > >
> > > //getters and setters..
> > > }
> > >
> > >
> > > **** EJB CLASS ****
> > > @Stateless
> > > public class MyEJB{
> > >
> > > @PersistenceContext(unitName ="ANY_NAME")
> > > private EntityManager em;
> > >
> > > public User getUserWithRoles(){
> > >
> > > CriteriaBuilder cb = em.getCriteriaBuilder();
> > > CriteriaQuery<User> cq = cb.createQuery(User.class);
> > > Root<User> root = cq.from(User.class);
> > >
> > > cq.where(cb.equal(root.get(User_.userName),"john"));
> > >
> > > User userJohn = em.createQuery(cq).getSingleResult(); // if i
> > want
> > > this work i have to do User userJohn =
> > > SerializationUtils.clone(em.createQuery(cq).getSingleResult()); [1*]
> > >
> > >
> > > //i will create a list of role just for try to set any role the
> > > userJohn
> > > List<Role> roleList = new ArrayList<Role>(2);
> > > roleList.add(new Role(1,'ADMIN'); //creating and adding role 1
> > > roleList.add(new Role(2,'DEVELOPER');//creating and adding role 2
> > >
> > > //setting the list of roles created to the user, as you can see
> the
> > > list has 2 values but the value roles of userJohn always is set to
> null,
> > my
> > > setters and getters are correct
> > > userJohn.setRoles(roleList);
> > >
> > > return userJohn;
> > > }
> > >
> > > }
> > >
> > > *** MANAGED BEAN ****
> > >
> > > @Named
> > > public class MyBean implements Serializable{
> > >
> > > @EJB
> > > private MyEJB ejb;
> > >
> > > public void anyMethod(){
> > > User user = ejb.getUserWithRoles();
> > > user.getRoles(); //<---- HERE THE LIST IS ALWAYS NULL but if i use
> > > clone in the ejb method (see 1*) i can get the corrected values.
> > >
> > > }
> > >
> > >
> > > }
> > >
> > > I know i can get the values fetching but im trying to not do it
> > >
> >
>
>
>
> --
> -------------------------------------------------------------------
> *SCJA. José Luis Cetina*
> -------------------------------------------------------------------
>
