Mark, the enhancement in detached forces cloning. In all case dti pattern is not that bad Le 19 oct. 2013 09:18, "Mark Struberg" <[email protected]> a écrit :
> Clone is not a good solution imo. > What kind of enhancement do you use? > > LieGrue, > strub > > > > > >________________________________ > > From: José Luis Cetina <[email protected]> > >To: [email protected] > >Sent: Friday, 18 October 2013, 21:57 > >Subject: Re: Entity cant be refreshed with new list values > > > > > >Thanks Romain, i tried using detach but i get the same behavior, with > clone > >is the only way that i could this working > > > > > > > >2013/10/18 Romain Manni-Bucau <[email protected]> > > > >> Create a copy or use a dto > >> Le 18 oct. 2013 20:06, "José Luis Cetina" <[email protected]> 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 <[email protected]> > >> > > >> > > 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 <[email protected]> > >> > > > >> > >> 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* > >> > >> > > ------------------------------------------------------------------- > >> > >> > > >> > >> > >> > > > >> > > > >> > > > >> > > -- > >> > > ------------------------------------------------------------------- > >> > > *SCJA. José Luis Cetina* > >> > > ------------------------------------------------------------------- > >> > > > >> > > >> > > >> > > >> > -- > >> > ------------------------------------------------------------------- > >> > *SCJA. José Luis Cetina* > >> > ------------------------------------------------------------------- > >> > > >> > > > > > > > >-- > >------------------------------------------------------------------- > >*SCJA. José Luis Cetina* > >------------------------------------------------------------------- > > > >
