DataModel, inheritance, NoRowAvailableException

[sl0005]

I have a number of beans with similar functions. I want to use one abstract parent class to unite these functions.
To implement DataModel I add in parent class following (copy from org.jboss.seam.framework.Query ) :

   @Transactional
    public DataModel getDataModel(){
           if (dataModel==null){
              dataModel = new ListDataModel();
              dataModel.setWrappedData(getResultList());
           }
           return dataModel;
    }
        
    @SuppressWarnings("unchecked")
    public E getDataModelSelection(){
           return (E) getDataModel().getRowData();
    }
        
    public int getDataModelSelectionIndex(){
           return getDataModel().getRowIndex();
    }

    public void edit(){
          setItem(getDataModelSelection());
    }

than I use DataModel in xhtml :

<h:form id="list">
    <rich:dataTable id="aList" var="item" value="#{bean.dataModel}">
        <h:column>
            <f:facet name="header">
             ......
            </f:facet>
         <s:link id="editItem" view="/editItem.xhtml" value="#{item.id}" action="#{bean.edit}"/>
        </h:column>
             ......

when I click on the link in table I get NoRowAvailableException.

Whan is wrong here?

[sl0005]

The solution is found!
Must be :

   @Transactional
    public DataModel getDataModel(){
           if (dataModel==null){
              dataModel = new ListDataModel();
              dataModel.setWrappedData(getResultList());
                 Contexts.getSessionContext().set("DataModelOne", dataModel);
           }
           return dataModel;
    }
        
    @SuppressWarnings("unchecked")
    public E getDataModelSelection(){
           return (E) getDataModel().getRowData();
    }
        
    public int getDataModelSelectionIndex(){
           return getDataModel().getRowIndex();
    }

    public void edit(){
          setItem(getDataModelSelection());
    }

than I use DataModel in xhtml :

<h:form id="list">
    <rich:dataTable id="aList" var="item" value="#{DataModelOne}">
        <h:column>
            <f:facet name="header">
             ......
            </f:facet>
         <s:link id="editItem" view="/editItem.xhtml" value="#{item.id}" action="#{bean.edit}"/>
        </h:column>
             ......

This way it is possible to use DataModel when you need been inheritance (because annotation @DataModel cannot be inherited, so here is a way around)