selecting item from primeface's selectOneMenu not working - jsf

Question

I'm having problem with getting the selected item from a selectOneMenu.Here is my JSF code:
<h:form id="mainfrm">
<h:panelGrid columns="2" style="margin-bottom:10px" cellpadding="5">
<h:outputText value="Basic Usage: " />
<p:selectOneMenu id="domaine" value="#{projet.currentDomaines}">
<f:selectItem itemLabel="Select One" itemValue="" />
<f:selectItems value="#{projet.initDomaines()}" var="d" itemValue="#{d}" itemLabel="#{d.libelleDomaine}" />
<p:ajax update="formEquipe" process="mainfrm" event="change" />
</p:selectOneMenu>
</h:panelGrid>
</h:form>
<h:form id="formEquipe">
<h:panelGrid id="display" columns="2" cellpadding="4">
<f:facet name="header">
<p:graphicImage value="/images/cars/xxxx.jpg"/>
</f:facet>
<h:outputText value="Domaine name :" />
<h:outputText value="#{projet.currentDomaines.libelleDomaine}"/>
<h:outputText value="Director :" />
<h:outputText value="#{projet.currentDomaines.nomDirecteur}" />
</h:panelGrid>
</h:form>
it seems like everything is right but i must be missing something... so i tested by changing the currentDomaines (object type Domaines) by text (String) and it worked, and here is the code :
<h:form id="mainfrm">
<h:panelGrid columns="2" style="margin-bottom:10px" cellpadding="5">
<h:outputText value="Basic Usage: " />
<p:selectOneMenu id="domaine" value="#{projet.text}">
<f:selectItem itemLabel="Select One" itemValue="" />
<f:selectItems value="#{projet.initDomaines()}" var="d" itemValue="#{d.libelleDomaine}" itemLabel="#{d.libelleDomaine}" />
<p:ajax update="formEquipe" process="mainfrm" event="change" />
</p:selectOneMenu>
</h:panelGrid>
</h:form>
<h:form id="formEquipe">
<h:panelGrid id="display" columns="2" cellpadding="4">
<f:facet name="header">
<p:graphicImage value="/images/cars/xxxx.jpg"/>
</f:facet>
<h:outputText value="Domaine name :" />
<h:outputText value="#{projet.text/>
</h:panelGrid>
</h:form>
and here is my backing bean:
public class ProjetsBean implements Serializable {
private DomainesService domainesService;
private Domaines currentDomaines;
private String text;
/////////////// setters & getters \\\\\\\\\\\\\\\\\\\
public void setCurrentDomaines(Domaines currentDomaines) {
this.currentDomaines=currentDomaines;
}
public Domaines getCurrentDomaines() {
return currentDomaines;
}
public void setText(String text) {
this.text=text;
}
public Integer getText() {
return text;
}
///////////////// Méthodes \\\\\\\\\\\\\\\
#PostConstruct
public List<Domaines> initDomaines() {
return domainesService.getAllDomaines();
}
}

Answer 1

The selection from a html selectbox will always be returned to the server as string. If you want to use objects in h:selectOneMenu you need a converter.
There is a comprehensive tutorial on that topic: "Objects in h:selectOneMenu".

Answer 2

For the most cases you can do it without an converter, but this is not wrong.
Here is an example:
<h:selectOneMenu value="#{bean.selectedObject.id}">
<f:selectItems value="#{bean.listOfObjects}" var="item" itemLabel="#{item.title}" itemValue="#{item.id}" />
</h:selectOneMenu>
Another idea is to use the hashcode instead of the ID (but in both: itemValue and value).