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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 18:06:19 GMT
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*
> -------------------------------------------------------------------
>



-- 
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*SCJA. José Luis Cetina*
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