Please help me

This is my Code

public ExtendedTableDataModel<Empleado> getEmpleadoDataModel() {

       if (empleadoDataModel == null) { 

            empleadoDataModel = new ExtendedTableDataModel<Empleado>(new DataProvider<Empleado>() {

                        private static final long serialVersionUID = 1L;

                        public Empleado getItemByKey(Object key) {

                          for (Empleado e : empleados) {

                                if (key.equals(getKey(e))) {

                                    return e;

                                }

                            }

                            return null;

                        }

                        public List<Empleado> getItemsByRange(int firstRow,    int endRow) {

                            return empleados.subList(firstRow, endRow);

                        }

                        public Object getKey(Empleado item) {

                            return item.getEmplId();

                        }

                        public int getRowCount() {

                            return empleados.size();

                        }

                    });

        }

        return empleadoDataModel;

    }

And this is the page

<h:form id="form">

        <h:panelGrid columns="2" columnClasses="top , top">

            <rich:extendedDataTable

                value="#{empleadoList.empleadoDataModel}" var="empleado" id="table"

                width="580px" height="400px"

                sortMode="#{empleadoList.sortMode}"

                selectionMode="#{empleadoList.selectionMode}"

                selection="#{empleadoList.selection}">

                <rich:column sortable="False" label="Apellido" id="col_1">

                    <f:facet name="header">

                        <h:outputText value="Apellido" id="apellido"/>

                    </f:facet>

                    <h:outputText value="#{empleado.apellido}" id="empApellido"/>

                </rich:column>

                <rich:column sortable="true" sortBy="#{empleado.nombre}" id="col_2"

                    filterBy="#{empleado.nombre}" filterEvent="onkeyup" width="170px"

                    label="Nombre">

                    <f:facet name="header">

                        <h:outputText value="Nombre" id="nombre"/>

                    </f:facet>

                    <h:outputText value="#{empleado.nombre}" id="empNombre"/>

                </rich:column>

                <rich:column sortable="true" sortBy="#{empleado.codigoEmpleado}" id="col_3"

                    filterBy="#{empleado.codigoEmpleado}" filterEvent="onkeyup" width="170px"

                    label="Codigo">

                    <f:facet name="header">

                        <h:outputText value="Codigo" id="codigo"/>

                    </f:facet>

                    <h:outputText value="#{empleado.codigoEmpleado}" id="empCodigo"/>

                </rich:column>

                <rich:column sortable="false" label="ES" id="col_4">

                    <f:facet name="header">

                        <h:outputText value="ES" id="es"/>

                    </f:facet>

                    <h:outputText value="#{empleado.entradaSalida}" id="emplEs"/>

                </rich:column>

                <a:support reRender="selectiontable" id="extended_table_bean_take_selection"

                    action="#{empleadoList.takeSelection}"

                    event="onselectionchange" />

                <f:facet name="footer">

                    <rich:datascroller id="scroll"  maxPages="5" />

                </f:facet>

            </rich:extendedDataTable>

            <h:panelGroup layout="block" style="width:250px">

                <rich:panel>

                    <f:facet name="header">

                        <h:outputText value="Sort/Selection modes changing" />

                    </f:facet>

                    <h:panelGrid columns="2">

                        <h:outputText value="Sort Mode:" />

                        <h:selectOneMenu value="#{empleadoList.sortMode}">

                            <f:selectItem itemLabel="Single" itemValue="single" />

                            <f:selectItem itemLabel="Multi" itemValue="multi" />

                            <a:support event="onchange" ajaxSingle="true" reRender="table" id="support_sort_onchange"/>

                        </h:selectOneMenu>

                        <h:outputText value="Selection Mode:" />

                        <h:selectOneMenu value="#{empleadoList.selectionMode}">

                            <a:support ajaxSingle="true" event="onchange" reRender="table" id="support_select_onchange"/>

                            <f:selectItem itemLabel="Single" itemValue="single" />

                            <f:selectItem itemLabel="Multi" itemValue="multi" />

                            <f:selectItem itemLabel="None" itemValue="none" />

                        </h:selectOneMenu>

                    </h:panelGrid>

                </rich:panel>

                <rich:panel>

                    <f:facet name="header">

                        <h:outputText value="Fila Seleccionada" />

                    </f:facet>

                    <rich:dataTable value="#{empleadoList.selectedItems}"

                        var="sel" id="selectiontable">

                        <rich:column>

                            <h:graphicImage value="#{sel.apellido}" />

                        </rich:column>

                        <rich:column>

                            <h:outputText value="#{sel.nombre}" />

                        </rich:column>

                        <rich:column>

                            <h:outputText value="#{sel.codigoEmpleado}" />

                        </rich:column>

                        <rich:column>

                            <h:outputText value="#{sel.entradaSalida}" />

                        </rich:column>

                    </rich:dataTable>

                </rich:panel>

            </h:panelGroup>

        </h:panelGrid>

    </h:form>

I am following the code in the examples, but any data show in the ExtendedDataTable .

Thanks a lot