I'm struggling this problem for some time now...

Here is my code that generates the problem, I must add that NO exception is thrown, the console is silent...

@Stateful
@Name("tripsManager")
@Interceptors(SeamInterceptor.class)
public class TripsManagerBean implements TripsManagerLocal, Serializable {


 @Logger
 private Log logger;

 @EJB
 TripServiceLocal tripService;

 @RequestParameter
 Long id;

 @DataModel
 List<Trip> tripList;

 @DataModelSelection
 @Out(required = false,scope=ScopeType.CONVERSATION)
 private Trip selectedTrip;


 public TripsManagerBean() {
 super();
 }


 @Factory("tripList")
 public void findTripsByUser() {
 logger.info("Getting trip list...");
 tripList = tripService.findTripsByUser(userName);
 }

 public String selectTrip() {
 logger.info("Selected trip: " + selectedTrip.getId());
 return "selectTrip";
 }

 public String selectTripForEdit() {
 logger.info("Selected trip: " + selectedTrip.getId());
 return null;
 }

 public void editTrip() {

 try {
 tripService.updateTripDetails(selectedTrip);

 logger.info("edit trip " + selectedTrip.getId() + " successfully");
 } catch (Exception e) {
 logger.error("fail to edit trip", e);

 }
 }

 public void deleteTrip() {
 try {
 tripService.deleteTrip(selectedTrip);
 tripList.remove(selectedTrip);
 logger.info("delete trip " + selectedTrip.getId() + " successfully");
 } catch (Exception e) {
 logger.error("fail to delete Trip", e);
 }
 }

 public void cancel() {
 // TODO Auto-generated method stub

 }

 @Remove
 @Destroy
 public void destroy() {
 }
}

@Stateless
@Name("tripEdit")
@Interceptors(SeamInterceptor.class)
public class TripEditAction implements TripEditLocal,Serializable {


 public static final int ACTION_SUCCESS = 100;

 public static final int ACTION_FAIL = 101;

 @Logger
 private Log logger;

 @EJB
 TripServiceLocal tripService;

 @In(create=true, scope=ScopeType.CONVERSATION)
 Trip selectedTrip;

 private int responseStatus;

 public TripEditAction() {
 super();
 }

 public int getResponseStatus() {
 return responseStatus;
 }

 public void setResponseStatus(int responseStatus) {
 this.responseStatus = responseStatus;
 }

 public void editTrip() {
 setResponseStatus(ACTION_FAIL);
 try {
 tripService.updateTripDetails(selectedTrip);
 setResponseStatus(ACTION_SUCCESS);
 logger.info("edit trip " + selectedTrip.getId() + " successfully");
 } catch (Exception e) {
 logger.error("fail to edit trip", e);
 setResponseStatus(ACTION_FAIL);
 }
 }

 public void cancel() {
 logger.error("Clear add new trip Form");
 }

}

my web page is this:

<t:div styleClass="content">
 <h:outputText value="<h3>Edit Trip</h3>" escape="false" />
 <t:div styleClass="inner_content_green medium" style="background-color:#FFFFFF;">
 <h:form id="editTripForm">

 <h:panelGrid id="editTripTable" columns="2" border="0" style="width:99%;">
 <h:panelGroup>
 <h:outputText value="Trip name<br/>" escape="false" />
 <t:inputText id="name" value="#{selectedTrip.name}" styleClass="text" required="true" />
 <t:inputHidden id="id" value="#{selectedTrip.id}" />
 <t:inputHidden id="responseStatus" value="#{tripEdit.responseStatus}" />
 <h:outputText value="<br/>" escape="false" />
 <t:message for="name" styleClass="errorMsg" forceSpan="true" >
 <h:outputText value=" " escape="false"/>
 </t:message>
 </h:panelGroup>
 <h:panelGroup>
 <h:outputText value="Date:<br/>" escape="false" />
 <h:inputText id="startDate" value="#{selectedTrip.startDate.time}" styleClass="text" required="true">
 <f:convertDateTime pattern="dd/MM/yyyy"/>
 </h:inputText>
 <h:graphicImage url="images/calendar/calendar.gif"
 alt="Click to open Calendar"
 onclick="displayCalendar(document.getElementById('editTripView:editTripForm:startDate'),'dd/mm/yyyy',this)"
 style="border:0px;vertical-align:top;"/>
 <t:message for="startDate" styleClass="errorMsg" forceSpan="true" >
 <h:outputText value=" " escape="false"/>
 </t:message>
 </h:panelGroup>

 <h:panelGroup>
 <h:outputText value="Country<br/>" escape="false" />
 <h:inputText id="country" value="#{selectedTrip.country}" styleClass="text" required="true"/>
 <h:outputText value="<br/>" escape="false" />
 <t:message for="country" styleClass="errorMsg" forceSpan="true" >
 <h:outputText value=" " escape="false"/>
 </t:message>
 </h:panelGroup>
 <h:panelGroup>
 <h:outputText value="City<br/>" escape="false" />
 <h:inputText id="city" value="#{selectedTrip.city}" styleClass="text" required="true"/>
 <h:outputText value="<br/>" escape="false" />
 <t:message for="city" styleClass="errorMsg" forceSpan="true" >
 <h:outputText value=" " escape="false"/>
 </t:message>
 </h:panelGroup>

 <a4j:commandButton value="Edit Trip"
 action="#{tripEdit.editTrip}"
 styleClass="submit"
 reRender="myTripsTable,editTripTable"
 oncomplete="checkResponseStatus('editTripView:editTripForm:responseStatus');" />

 <a4j:commandButton value="Cancel"
 action="#{tripEdit.cancel}"
 styleClass="submit"
 reRender="editTripTable"
 onclick="closePopup();return false;" />

 </h:panelGrid>
 </h:form>
 </t:div>
</t:div>
</f:subview>

When I try to save changes (press Edit Trip button) I get "Error during model data update" for all fields.
I really don't understand what the problem is, every thing looks fine. Or is it???

Thanks