[jboss-user] [JBoss Seam] - Merging objects problems.
I have a form which a user can input a group name and other group information. The EJB3
backing the form persists/merges the Injected Group object given there are no errors.
My Problem:
First I could not get em.persist(group) to persist more than one Group object after a form
submit because of org.hibernate.PersistentObjectException: detached entity passed to
persist:....
So, then I started using em.merge(group) on the Group object, which fixed the previous
problem, but led to another. When I am creating two different groups by submitting the
form twice with different information, the entity manager appears only update the same
group by the console output:
Output after em.merge(group) after the form submit the first time:
| 16:11:26,634 INFO [RegisterGroupAction] Registered new Group asdf with id: 4
|
Output after em.merge(group) after the form submit the second time with different data.
| 16:11:41,496 INFO [RegisterGroupAction] Registered new Group blah with id: 4
|
This is not the behavior I want, I want a new Group object to be persisted every time the
user submits a new group form, so I should be seeing the id incremented, not staying the
same, how can I do this.
| @Stateless
| @Name("registerGroup")
| public class RegisterGroupAction implements RegisterGroup {
|
| @In(create=true) @Out @Valid
| private Group group;
|
| @PersistenceContext
| private EntityManager em;
|
| @Logger
| private Log log;
|
| public String register() {
| List existing = em.createQuery("select name from Group where name =
:name")
| .setParameter("name", group.getName())
| .getResultList();
| if (existing.size()==0) {
| group = em.merge(group);
| //em.persist(group);
|
| FacesMessages.instance().add("Group successfully created");
| log.info("Registered new Group #{group.name} with id: " +
group.getGroupId());
| return "/showGroup.jsp";
| } else {
| FacesMessages.instance().add("Group name already exists, please choose
another");
| return null;
| }
| }
| }
|
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