p:dataTable single row selection

Question

I have a problem selecting a row from a datatable in PrimeFaces. My selected object in the managed bean is null. For some reason, selected object from the datatable is not setting up correctly the property selectedItinerary in my managed bean.

   <p:dataTable id="singleDT" value="#{travellerSearchFlightsManagedBean.searchList}" var="s"  selectionMode="single" selection="#{travellerSearchFlightsManagedBean.selectedItinerary}" rowKey="#{s.iden}" >

                                <f:facet name="header">  
                                    Found itineraries
                                </f:facet>
                                <p:column headerText="Departure Location">
                                    <h:outputText value="#{s.departureLocation}" />  
                                </p:column>
                                <p:column headerText="Arrival Location">
                                    <h:outputText value="#{s.arrivalLocation}" />  
                                </p:column>
                                <p:column headerText="Departure Date">
                                    <h:outputText value="#{s.departureDate}" />  
                                </p:column>
                                <p:column headerText="Cost">
                                    <h:outputText value="#{s.cost}" />  
                                </p:column>
                                <p:column headerText="Stops">
                                    <h:outputText value="#{s.stopPrint}"   />  
                                </p:column>
                                <f:facet name="footer">
                                    <p:commandButton process="singleDT" value="Reserve itinerary" action="#{travellerSearchFlightsManagedBean.reserveFlight()}" />
                                </f:facet>

      </p:dataTable>

and the managed bean is like this:

@Named(value = "travellerSearchFlightsManagedBean")
@RequestScoped
public class travellerSearchFlightsManagedBean{


@EJB
private itineraryTravellerFacadeLocal itineraryTravellerFacade;

@EJB
private itineraryFacadeLocal itineraryFacade;

@ManagedProperty(value="#{travellerLoginManagedBean}")
private travellerLoginManagedBean loginBean;
private String departureLocation;
private String arrivalLocation;
private Date departureDate;
private int departureHour;
private int departureMinute;
private int numPassengers;
private int maxStops;
private String economyOrBusiness;
private ArrayList<itineraryDTO> itinerariesList;
private ArrayList<itineraryTraveller> searchList;
private itineraryTraveller selectedItinerary;
private String stopPrint;
private static final Logger LOG = Logger.getLogger(travellerSearchFlightsManagedBean.class.getName());



public String getStopPrint() {
    return stopPrint;
}

public travellerLoginManagedBean getLoginBean() {
    return loginBean;
}



public void setLoginBean(travellerLoginManagedBean loginBean) {
    this.loginBean = loginBean;
}

public void setStopPrint(String stopPrint) {
    this.stopPrint = stopPrint;
}

public itineraryTraveller getSelectedItinerary() {
    return selectedItinerary;
}

public void setSelectedItinerary(itineraryTraveller selectedItinerary) {
    this.selectedItinerary = selectedItinerary;
}

public ArrayList<itineraryTraveller> getSearchList() {
    return searchList;
}

public void setSearchList(ArrayList<itineraryTraveller> searchList) {
    this.searchList = searchList;
}

public ArrayList<itineraryDTO> getItinerariesList() {
    return itinerariesList;
}

public void setItinerariesList(ArrayList<itineraryDTO> itinerariesList) {
    this.itinerariesList = itinerariesList;
}

public itineraryFacadeLocal getItineraryFacade() {
    return itineraryFacade;
}



public String getEconomyOrBusiness() {
    return economyOrBusiness;
}

public void setEconomyOrBusiness(String economyOrBusiness) {
    this.economyOrBusiness = economyOrBusiness;
}



public void setItineraryFacade(itineraryFacadeLocal itineraryFacade) {
    this.itineraryFacade = itineraryFacade;
}


public String getDepartureLocation() {
    return departureLocation;
}

public void setDepartureLocation(String departureLocation) {
    this.departureLocation = departureLocation;
}

public String getArrivalLocation() {
    return arrivalLocation;
}

public void setArrivalLocation(String arrivalLocation) {
    this.arrivalLocation = arrivalLocation;
}

public Date getDepartureDate() {
    return departureDate;
}

public void setDepartureDate(Date departureDate) {
    this.departureDate = departureDate;
}

public int getDepartureHour() {
    return departureHour;
}

public void setDepartureHour(int departureHour) {
    this.departureHour = departureHour;
}

public int getDepartureMinute() {
    return departureMinute;
}

public void setDepartureMinute(int departureMinute) {
    this.departureMinute = departureMinute;
}

public int getNumPassengers() {
    return numPassengers;
}

public void setNumPassengers(int numPassengers) {
    this.numPassengers = numPassengers;
}

public int getMaxStops() {
    return maxStops;
}

public void setMaxStops(int maxStops) {
    this.maxStops = maxStops;
}

public travellerSearchFlightsManagedBean() {
}

public void searchFlights(){

    try{
        int numPassengersEconomy=0;
        int numPassengersBusiness=0;
        if (economyOrBusiness.equals("Economy")){
            numPassengersEconomy=numPassengers;
        }else{
            numPassengersBusiness=numPassengers;
        }

        searchList = new ArrayList<itineraryTraveller>();
        itinerariesList= new ArrayList<itineraryDTO>();
        int id=itineraryFacade.findItineraries(itinerariesList,departureLocation, arrivalLocation,departureDate,numPassengersEconomy, numPassengersBusiness);
        searchList=itineraryFacade.listItineraries(maxStops,itinerariesList,arrivalLocation, departureLocation, numPassengersEconomy, numPassengersBusiness);
    } catch(NullPointerException e) {}

}


public void reserveFlight(){
    //if (){
    try{

        //status reserved when traveller reserves an itinerary
        selectedItinerary.setStatus('r');
        //set the userName from the user who reserved this itinerary before persist it in a shared among all users db

        //persist the reserved itinerary in the db
        itineraryTravellerFacade.create(selectedItinerary);

     } catch(NullPointerException e) {}
}

}