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From José Luis Cetina <maxtorz...@gmail.com>
Subject Re: Entity cant be refreshed with new list values
Date Fri, 18 Oct 2013 18:05:37 GMT
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*
> > -------------------------------------------------------------------
> >
>



-- 
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*SCJA. José Luis Cetina*
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