Problems with selectBooleanCheckbox on a rich:dataTable that uses SerializableDataModel

[igorstephano]

Hi,
Im using JSF RichFaces with JBOSS Seam.
Ive got a rich:dataTable inside a ruch:modalPanel. This dataTable has 3 columns the first with code,
the second with name and the third with a h:selectBooleanCheckbox.
This dataTable is loaded with a SerializableDataModel and I use a rich:datascroller for move through the pages.
I have to save all the selected rows in a list of objects.
I save it when I check the selectBooleanCheckbox, I use this code:

                              <h:selectBooleanCheckbox value="#{unidad.seleccionado}">
                                   <a4j:support event="onchange"
                                        action="#{proyectoNuevoAction.agregarEntidadParticipante(unidad)}"
                                        ajaxSingle="true" />

                              </h:selectBooleanCheckbox>
                              
When I scroll to the 2 page for example and I check
one of the 10 rows the element unidad has the value of the row and I enter to the function
proyectoNuevoAction.agregarEntidadParticipante(unidad) so I can save the row,
but when I try to check a second row in the same 2 page the element now is null and don't enter
to the function.
I have figured out that everytime that I do a request on this page the function of the
action class that load the elements is called.

@Override
     protected Collection<AdmEntidad> loadData(int firstResult,
               int numberOfRows, String orderField, String orderDirection) {
               
               }
               
The first time it tha variable firsResult has 20(cause we are on the 2 page), but
the next time I press another selectBooleanCheckbox it has the value 0.
Now I don't know how to do to if Im in the second page and if I press the selectBooleanCheckbox
the variable firstResult of the load function has the value of 20 instead of 0.


This is my action

@Name("entidadPaginacion")
@Scope(ScopeType.CONVERSATION)
public class EntidadPaginacion extends Paginacion<AdmEntidad> {

     private static final long serialVersionUID = 1L;

     @Override
     public Serializable getId(AdmEntidad entity) {
          return entity.getCodigoEntidad();
     }

     @Override
     protected int countRecords() {
          int totalUnidadesEjecutoras = 0;
          totalUnidadesEjecutoras = BOLocatorController.getAdmEntidadBO().countAll()
          return totalUnidadesEjecutoras;
     }

     @Override
     protected Collection<AdmEntidad> loadData(int firstResult,
               int numberOfRows, String orderField, String orderDirection) {

          Collection<AdmEntidad> unidades = new ArrayList<AdmEntidad>();
          
                              unidadesEjecutoras = BOLocatorController
                                        .getAdmEntidadBO()
                                        .searchAll();
                         
          return unidades;
     }
     
     This is my dataTable
     
     <rich:dataTable id="tablaUnidadEjecutora" value="#{entidadPaginacion}"
                var="unidad"
               rowClasses="fila-par, fila-impar" rows="10">
               <f:facet name="header">
                    <h:outputText
                         value="#{messages['sipp.modal.buscarunidad.tabla.titulo']}" />
               </f:facet>

               <rich:column sortBy="#{unidad.nemonicoEntidad}">
                    <f:facet name="header">
                         <h:outputText
                              value="#{messages['sipp.modal.buscarunidad.tabla.columna.nemonico']}" />
                    </f:facet>
                    <h:outputText value="#{unidad.nemonicoEntidad}" />
               </rich:column>

               <rich:column sortBy="#{unidad.razonSocial}">
                    <f:facet name="header">
                         <h:outputText
                              value="#{messages['sipp.modal.buscarunidad.tabla.columna.nombre']}" />
                    </f:facet>
                    <h:outputText value="#{unidad.razonSocial}" />
               </rich:column>

               <rich:column width="100" styleClass="centered">
                    <f:facet name="header">
                         <h:outputText value="#{messages['sipp.tabla.columna.opciones']}" />
                    </f:facet>
                    <h:panelGroup>
                         <h:selectBooleanCheckbox value="#{unidad.seleccionado}">
                                   <a4j:support event="onchange"
                                        action="#{proyectoNuevoAction.agregarEntidadParticipante(unidad)}"
                                        ajaxSingle="true" />
                              </h:selectBooleanCheckbox>
                    </h:panelGroup>
               </rich:column>
               <f:facet name="footer">
                    <h:panelGrid columns="4">
                         <a4j:commandButton value="#{messages['sipp.boton.aceptar']}"
                              onclick="Richfaces.hideModalPanel('listaMultiEjecutoras'); "
                              action="#{proyectoNuevoAction.agregarEntidadesParticipantes}"
                              ajaxSingle="true"
                              reRender="entidadesParticipantesForm, tablaUnidadEjecutora" />
                         <a4j:commandButton value="#{messages['sipp.boton.cerrar']}"
                              onclick="Richfaces.hideModalPanel('listaMultiEjecutoras'); "
                              action="#{proyectoNuevoAction.seleccionarEntidadesParticipantes}"
                              ajaxSingle="true"
                              reRender="entidadesParticipantesForm, tablaUnidadEjecutora" />
                         <rich:datascroller  />
                    </h:panelGrid>
               </f:facet>
          </rich:dataTable>



Hope someone can help me.

Thanks in advance