Create a copy or use a dto
Le 18 oct. 2013 20:06, "José Luis Cetina" <maxtorzito@gmail.com> a écrit :

> I only want to add some info to a retrieved object but i dont want to
> persist that new info
>
>
> 2013/10/18 José Luis Cetina <maxtorzito@gmail.com>
>
> > But if use a transaction the new values will be committed and i want that
> > values as a read only
> >
> >
> > 2013/10/18 Romain Manni-Bucau <rmannibucau@gmail.com>
> >
> >> Cause you arent managed...do the whole method in an ejb (with a
> >> transaction)
> >> Le 18 oct. 2013 19:30, "José Luis Cetina" <maxtorzito@gmail.com> 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 <rmannibucau@gmail.com>
> >> >
> >> > > Hi
> >> > >
> >> > > Your entity is not managed so you cant do it. It is normal.
> >> > > Le 18 oct. 2013 19:09, "José Luis Cetina" <maxtorzito@gmail.com> 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*
> >> > -------------------------------------------------------------------
> >> >
> >>
> >
> >
> >
> > --
> > -------------------------------------------------------------------
> > *SCJA. José Luis Cetina*
> > -------------------------------------------------------------------
> >
>
>
>
> --
> -------------------------------------------------------------------
> *SCJA. José Luis Cetina*
> -------------------------------------------------------------------
>