#ManagedProperty initialization - jsf-2

Question

I want to store the selected value of the first attribute managedabean "refCont" in a second attribute of the managed bean and then I'll post. but the value will show that after the second selection knowing that the value displayed is the one selected for the first time. I do not know what's sake
.xhtml
<h:outputText value="* Contact" />
<h:selectOneMenu id="contact" value="#{reclamationMB.refCont}" onchange="lazyload()">
<c:set value="#{reclamationMB.refCont}" target="#{contactMB}" property="refContt" />
<f:ajax listener="#{contactMB.affichReclContact}" />
<f:selectItem itemLabel="Select One" noSelectionOption="true" itemValue="---" />
<f:selectItems value="#{contactMB.contactsClient}" noSelectionValue="" var="contact" itemValue="#{contact.refCont}" itemLabel="#{contact.nomCont}" />
<f:selectItems itemLabel="Autre" itemValue=""></f:selectItems>
</h:selectOneMenu>
first ManagedBean:
#RequestScoped
public class ReclamationMB extends AbstractMB implements Serializable {
private int refCont;//ref contact recuperé pour la creation de la reclamation
.....
//getter and setter
Second Mnaged bean
#RequestScoped
public class ContactMB extends AbstractMB implements Serializable {
#ManagedProperty("#{reclamationMB.refCont}")
private int refContt;
.....
//getter an setter
public void affichReclContact(AjaxBehaviorEvent event){
contact=service.AffichContact(refContt);
setContact(contact);
}

Answer 1

The problem is that JSTL's <c:set> is a view build time tag handler, and not a view render time UI component, so your problem is a classical one: when you expect it to set the value, it is no longer there in the component tree. Moreover, it has run when there was no <h:selectOneMenu> tag at all.
Of course, if <h:selectOneMenu> implemented ActionSource, just like <h:commandButton>, you could have nested JSF <f:setPropertyActionListener> for the reason of setting the bean property with the needed values, as in <f:setPropertyActionListener target="#{contactMB.refContt}" value="#{reclamationMB.refCont}">. But you can't do that.
Basically you can do two things:
Use PrimeFaces <p:remoteCommand> tag, which can hold the abovementioned action listener to set the needed value, and call it in onchange method. There are a bunch of such examples here on Stack Overflow and in excellent PrimeFaces' documentation.
Make use of bean injection, instead of just bean property injection. In the former case, the expression reclamationMB.getRefCont() will always yield the right result in the holder bean, provided that reclamationMB is the variable to hold the injected bean by #ManagedProperty.