problem selecting row with f:param

[i92jurir]

Hi,

I´m having a problem selecting a row from a datatable. I know it´s a very common task in web applications but I have tried a lot of ways and I can´t make it work anyway.

The page with the datatable is:

<rich:dataTable value="#{hoteles}" var="hot">

  <h:column id="column1">
         <f:facet id="NameFacet" name="header">Nombre</f:facet>
            #{hot.nombre}
      </h:column>

  <h:column id="column2">     
         <f:facet id="NameFacet" name="header">Seleccionar</f:facet>
            <s:link value="Reservar" view="/reservarPaso1.xhtml" propagation="begin">       <!-- Link to booking page. We start a LRC -->
                <f:param name="hotelSeleccionado" value="#{hot}"/>                                   <!-- We pass the selected row -->
            </s:link>            
  </h:column>

</rich:dataTable>

My idea is pass the selected row (the hotel) with a page paramameter to a booking page.    #{hoteles} is populated with this method triggered with a page action:

public void buscarHoteles() {
       
      // Hacemos la busqueda
      hoteles = entityManager.createQuery("select h from Hotel h").getResultList();
        
}

The target page (booking page) is:

... 
<h:form id="reservarPaso1Form">   

        <rich:panel>
            <f:facet name="header">Paso 1</f:facet>

            <s:decorate id="fechaEntradaField" template="layout/edit.xhtml">
                <ui:define name="label">Fecha entrada</ui:define>
                <rich:calendar id="fechaEntrada"
                       required="true"
                          value="#{nuevaReserva.fechaEntrada}" datePattern="MM/dd/yyyy" />     <!-- nuevaReserva is created and stored in Conversation Context when page is show -->
            </s:decorate>


            <s:decorate id="fechaSalidaField" template="layout/edit.xhtml">
                <ui:define name="label">Fecha salida</ui:define>
                <rich:calendar id="fechaSalida"
                          value="#{nuevaReserva.fechaSalida}" datePattern="MM/dd/yyyy" />
            </s:decorate>

         </rich:panel>

</h:form>
...

Booking.page.xml is:

<page view-id="/reservarPaso1.xhtml">
     <param name="hotelSeleccionado" value="#{nuevaReserva.hotel}"/>         <!-- Parameter goes to hotel attribute inside nuevaReserva instance -->
</page>

When I run the application this exception is thrown.

WARN  [SeamPhaseListener] uncaught exception, passing to exception handler

javax.el.ELException: java.lang.IllegalArgumentException: argument type mismatch

I have tried using DataModel and DataModelSelection but hotelSeleccionado is not storing in conversation context when booking page is shown. I have tried too Contexts.getConversationContext.set("hotelSeleccionado",hotel) in an action method to store the object in context but the object doesn´t appear in seam debug page. Anybody can give me some help?

Sorry for long post. Thanks in advance.

[i92jurir]

It´s solved.

Link in the page to select the row.

<h:column id="column5">
         <f:facet id="NameFacet" name="header">Seleccionar</f:facet>            
         <s:link value="Reservar" action="#{findHotels.startBooking}" propagation="begin"/>  
</h:column>

In findHotels bean:

@DataModel
private List<Hotel> hoteles;             //hotels list
    
@DataModelSelection @Out(required=false, scope=ScopeType.CONVERSATION)  // selected hotel
private Hotel hotelSeleccionado;       

public String startBooking() {
     return "/reservarPaso1.xhtml";
}

The trick was put @Out(required=false, scope=ScopeType.CONVERSATION) in the selected hotel.

When startBooking is called hotelSeleccionado is inyected with @DataModelSelection. When the method ends hotelSeleccionado is outyected to conversation context.