Hello,

I've got a strange pb on Seam 2.02SP1.

I've got a first component browseHdl which initialize a list of item as a datamodel (items) from url parameters.

@Stateful
@Name("browseHdl")
public class BrowseHandlerBean implements BrowseHandler {

     @In
     private EntityManager entityManager;

     @In(create = true)
     private SessionHandler sessionHdl;

     @In(create = true)
     OrderHome orderHome;

     @In
     ApplicationConfig applicationConfig;

     @Logger
     private Log log;

     @DataModel
     private List<Item> items;

     @DataModelSelection
     private Item item;

     @Factory("items")
     @SuppressWarnings("unchecked")
     public void findItems() {
          log.debug("Launching Request !");
          log.debug("group : {0} family : {1}", sessionHdl.getSelGroup(),
                    sessionHdl.getSelFamily());
          items = entityManager.createNamedQuery("browseProducts").setParameter(
                    "collectionRef", applicationConfig.getCollection())
                    .setParameter("groupRef", sessionHdl.getSelGroup())
                    .setParameter("familyRef", sessionHdl.getSelFamily())
                    .getResultList();
          log.debug("Request returned {0} items", items.size());
     }

     
}

This List is used in facelets page to list the items in a rich faces datagrid.

To display information on each item in this page, I use another component (itemHdl) to be able to retrieve specific item content depending on user context (different languages and currencies). Also some items can contain more than one article in a list and some only one. That's why I made the isSingle() method. Of course the articles list is configured to be lazily loaded.

@Stateful
@Name("itemHdl")
@AutoCreate
public class ItemHandlerBean implements ItemHandler {

     @In(required = false)
     @Out(required = false)
     private Item item;

     private Article selArt;

     @Logger
     private Log log;

     @In
     private OrderHome orderHome;

     @In
     private SessionHandler sessionHdl;

     @In
     private FacesMessages facesMessages;

     @In
     private EntityManager entityManager;

     (...)

        // This method triggers the loading of articles list
     public boolean isSingle() {
          return item.getArticles().size() == 1;
     }

     (...)

Here is the part of my page with the datagrid

<rich:dataGrid id="browseAllSize" columns="3" elements="6"
     value="#{items}" var="item" styleClass="productList">

          <h:commandLink action="#{browseHdl.itemSelected}">
          <h:graphicImage
               value="/data/products/#{item.style.collection.ref}/thumb/#{itemHdl.ref}.jpg"
               styleClass="thumb"
          />
     </h:commandLink>
     <div><h:commandButton
          image="/layout/img/#{messages['plist.button.add2bag1']}"
          action="#{itemHdl.addToBag}" styleClass="button" rendered="#{itemHdl.single}">
             </h:commandButton></div>
(...)
</rich:dataGrid>

This give a Lazy initialization exception (transaction is not active) when fetching the isSingle value in the rendered attribute of the commandButton.
If I change the code to this

<rich:dataGrid id="browseAllSize" columns="3" elements="6"
     value="#{items}" var="item" styleClass="productList">

#{itemHdl.single?'single':'multiple'} <!-- new line added -->

          <h:commandLink action="#{browseHdl.itemSelected}">
          <h:graphicImage
               value="/data/products/#{item.style.collection.ref}/thumb/#{itemHdl.ref}.jpg"
               styleClass="thumb"
          />
     </h:commandLink>
     <div><h:commandButton
          image="/layout/img/#{messages['plist.button.add2bag1']}"
          action="#{itemHdl.addToBag}" styleClass="button"> <!-- No more rendered attribute -->
             </h:commandButton></div>
(...)
</rich:dataGrid>

everything is fine. I keep fetching isSingle in an el test but no more in a rendered attribute.

I'm not a specialist in JSF life cycle but I guess that rendered value are not evaluated in the same phase than pure el content. Could someone explain why this doesn't work and how to use a method trigering lazy loading in a rendered attribute or what I did wrong ?

Thank you very much.

Antoine