[jboss-user] [JBoss Seam] - DataModel entries appearing twice

[enrico256]

I'm writing simple CRUD application  that handles I'm writing simple CRUD application that handles "folders" and associated "items". The list of all folders is displayed on the home page as following:

  | <h:dataTable value="#{folders}" var="_folder">
  | 	<h:column>
  | 		<f:facet name="header">Id</f:facet>
  | 		<s:link action="#{folderFinder.selectFolder}" value="#{_folder.id}"/>
  | 	</h:column>
  | 	<h:column>
  | 		<f:facet name="header">Title</f:facet>
  | 		<h:outputText value="#{_folder.title}" />
  | 	</h:column>
  | 	?
  | </h:dataTable>
  | 
"folders" are managed in a SFSB:

  |     ?
  |     @DataModel("folders")
  |     List<Folder> folders;
  |     
  |     @DataModelSelection
  |     @Out(required=false)
  |     Folder folder;
  |     
  |     @In(create=true) @Out(required=false)
  |     transient ItemFinder itemFinder;
  | 
  |     @Out(required=false)
  |     List<Item> item;    
  |     
  |     @Factory("folders")
  |     public void refresh() {
  |     	folders = em.createQuery("from Folder").getResultList();
  |     }
  |     
  |     @Begin(join=true)
  |     public String selectFolder() {
  |     	itemFinder.refresh(folder); //init "items" to contain items from this folder
  |      	return "view_folder";
  |     }
  |     ?
  | 

So far so good. My problem starts when I select a folder and display it with its items as every item appears twice in the dataTable! A folder is displayed as following :


  | <t:panelTabbedPane ? >
  | 	<t:panelTab label="Folder">
  | 		<h:panelGrid columns="2">
  | 			<h:outputText value="Id"/>
  | 			<h:outputText value="#{folder.id}"/>
  | 			<h:outputText value="#Title"/>
  | 			<h:outputText value="#{folder.title}"/>
  | 			?
  | 		</h:panelGrid>
  | 	</t:panelTab>
  | 
  | 	<t:panelTab label="Items">
  | 	   	<h:dataTable value="#{items}"  var="_item" >
  | 			<h:column>
  | 				<f:facet name="header">Item id</f:facet>
  | 				<s:link action="#{itemFinder.selectItem}" value="#{_item.id}"/>
  | 			</h:column>
  | 			<h:column>
  | 				<f:facet name="header">Type</f:facet>
  | 				<h:outputText value="#{_item.type}" />
  | 			</h:column>
  | 			?
  | 		</h:dataTable>
  | 	</t:panelTab>
  | </t:panelTabbedPane>
  | 

"itemFinder" is a SFSB the manages "items":


  |     @DataModel("items")
  |     List<Item> items;
  |     
  |     @DataModelSelection
  |     @Out(required=false)
  |     Item item;
  |     
  |     public void refresh(Folder folder) {
  |     	items = folder.getItems();
  |     }
  | 

Needless to say the database contains only one copy of each item. 
I?m using Seam 1.2.1, AS 4.0.5, MySQL 5.0 and mysql-connector-3.1.13.

I would appreciate if anybody could point me in the right direction. 

Thanks in advance,

Enrico


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