Convert a GET parameter with JSF

I would like to create a simple page that would diplay a user information

For instance if I reach ../profile.xhtml?id=10 I would like to get the page of the user with id=10.

Thus I would like to have an instance of this User in my profile.xhtml page.

I have tried :

<f:metadata>
    <f:viewParam id="id" name="id" value="#{shownUser}"/>
    <f:converter binding="#{userConverter}" />
</f:metadata>

with

@ManagedBean
@RequestScoped
public class UserConverter implements Converter {

@EJB
UserDAO userDao;

@Override
public Object getAsObject(FacesContext context, UIComponent component, String value) {
    User u = userDao.findFromId(value);
    return u;
}

@Override
public String getAsString(FacesContext context, UIComponent component, Object obj) {
    User u = (User) obj;
    return u.getId().toString();
}

I expect to have my user as shownUser, unfortunatly the only answer I have is <f:converter> Parent not an instance of ValueHolder: javax.faces.component.UIViewRoot@10d8bc41 I deduce that doesn't work within but this contradicts with :

What can <f:metadata>, <f:viewParam> and <f:viewAction> be used for?

I succeed with (alongside a proper getAsObject(String id) function):

but I feel I miss the point of using the <f: /> tag and converters.

So my question is : Is it the common way to convert GET parameter ?

NB: I didn't used the converter properties of <f:viewParam> to be able to inject @EJB in the converter