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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 17:58:54 GMT
Do you have any advice?


2013/10/18 José Luis Cetina <maxtorzito@gmail.com>

> 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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