[jboss-user] [JBoss Seam] - entity-query vs. Manager-nested @Factory List

[quilian]

Hi all!

I declared the following in components.xml:

    <framework:entity-query name="alleBenutzer" ejbql="select benutzer from BenutzerImpl benutzer" />

i assumed that this would also do the trick:

  | 
  | @Stateful
  | @Scope(ScopeType.SESSION)
  | @Name("gruppenManager")
  | public class GruppenManagerImpl implements Serializable, GruppenManager {
  | 	@PersistenceContext(type = PersistenceContextType.EXTENDED)
  | 	private EntityManager em;
  | 
  | 	@DataModel // (scope=ScopeType.PAGE)
  | 	private List<GruppeImpl> gruppenList;
  | 
  | 	@Factory(value = "gruppenList")
  | 	public void findGruppen() {
  | 		gruppenList = em.createQuery("select gruppe from GruppeImpl gruppe order by id").getResultList();
  | 	}
  | 	...
  | }
  | 


I use s:selectItems and s:convertEntity to show the list of Gruppen:


  |  <h:selectOneMenu  id="selectGruppenAuswahl" value="#{selectedBenutzer.gruppe}" required="true">
  |     <s:selectItems id="gruppenAuswahl" value="#{alleGruppen}" var="gruppeItem" label="#{gruppeItem.label}"/>
  |     <s:convertEntity />
  |   </h:selectOneMenu> 
  | 

however, when using gruppenList instead of alleGruppen as value for s:selectItems the form looks like before, but on submission, i get this well know validation failed error:
selectGruppenAuswahl is not a valid entry.

The interesting this is, i get this only if i dont select another entry from the list. In that case i get the "detached entity passed to persist" exception, which happens anyway after the validation is complete. But thats for another posting. The this is the validation gets through if i select another entry.

I thought the two ways to do the query would be more or less interchangeable.
I dont know why, but the logged select statements are different for the two options:

for the framework:entity-query

  | 11:05:16,984 INFO  [STDOUT] Hibernate: select gruppeimpl0_.id as id5_, gruppeimpl0_.name as name5_, gruppeimpl0_.version as version5_, gruppeimpl0_.status as status5_ from gruppen gruppeimpl0_
  | 11:05:21,734 INFO  [STDOUT] Hibernate: select gruppeimpl0_.id as id5_, gruppeimpl0_.name as name5_, gruppeimpl0_.version as version5_, gruppeimpl0_.status as status5_ from gruppen gruppeimpl0_
  | 

and for the @Factory solution:

  | 11:01:42,593 INFO  [STDOUT] Hibernate: select gruppeimpl0_.id as id1_, gruppeimpl0_.name as name1_, gruppeimpl0_.version as version1_, gruppeimpl0_.status as status1_ from gruppen gruppeimpl0_
  | 11:01:44,312 INFO  [STDOUT] Hibernate: select gruppeimpl0_.id as id1_0_, gruppeimpl0_.name as name1_0_, gruppeimpl0_.version as version1_0_, gruppeimpl0_.status as status1_0_ from gruppen gruppeimpl0_ where gruppeimpl0_.id=?
  | 

I completely dont understand this. But it might be a clue. The first query is done when the page loads, whereas the latter is called when the form is submitted. 

The generated HTML forms also differ in the selection index - the value which the client selects. The ordering is not the same. Could this be a reason?

Thanks for any help.
Tobias Kilian

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