Question

I create a composition template:

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets" 
    xmlns:cs="http://java.sun.com/jsf/composite/composite">

    <h:panelGroup rendered="#{not empty userc.userb.user.id}">
        <h:panelGrid columns="3">
            <h:outputText value="Welcome, " />
            <h:outputLink value="profile.xhtml">
                <h:outputText value="#{userc.personb.person.name}" />
            </h:outputLink>

            <h:form>
                <h:commandLink action="#{userc.logout}">Log out</h:commandLink>
            </h:form>
        </h:panelGrid>
    </h:panelGroup>

    <h:panelGroup rendered="#{empty userc.userb.user.id}">
        <h:outputLink value="pages/login.xhtml">Login</h:outputLink>
    </h:panelGroup>
</ui:composition>   

My intention is to hide the first panelGroup if the user is not logged, if he does then I hide the second panelGroup then show the first one.

I’m trying do this but doesn’t work.
Any idea ?

Without login:

After login:

with login http://img89.imageshack.us/img89/9866/0602nov.jpg

Answer 1

In your entity.User class, replace

private int id;

by

private Integer id;

This way it will default to null instead of 0 and thus #{empty userc.userb.user.id} will be true. The common practice is anyway to use wrappers instead of primitives in entity’s properties.