9 Replies Latest reply on Nov 12, 2007 1:01 PM by pmuir

    DataModel bug in Seam 2

    andreigh.ts
    andreigh.ts Nov 8, 2007 11:16 AM

      Hello we have migrated from Seam 1.2.1 to Seam 2.0 and there is an annoing behavior of DataModel - if the DatgaModel is on a long running conversation and holds a list of database entities, the values of the entities are null after the first display of the page.

      To be more concrete:
      The bean (assume we are inside an already started long running conversation ):

      @Scope(ScopeType.CONVERSATION)
@Name("requestWizard_attachments")
public class AttachmentsAction {
...
 @In
 private EntityManager entityManager;

 @DataModel
 private List<CoreBuyer> buyerList;

 @Factory("buyerList")
 public void refreshBuyerList() {
 buyerList = new ArrayList<CoreBuyer>();
 buyerList.add(entityManager.find(CoreBuyer.class, 1));
 }
...
}


      The xhtml: 
      ...
 <h:dataTable var="item" value="#{buyerList}" >
 <h:column >
 <f:facet name="header">
 <h:outputText value="buyer" />
 </f:facet>
 #{item.buyerId},#{item.name}
 </h:column>
 </h:dataTable>
...


      The scenario is like this:

      - After conversation started we go to attachments page
      - the list of buyers (actually has 1 item in the simplified example above) displays correctly
      - we navigate to another page, but we are still in the conversation
      - we click again on attachments link in order to navigate to the page again
      - the list of buyers still has one item, but all values of the item are null!!

      What happens?


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