I have the next code:

<li>
    <h:form rendered="#{!loginController.session}">
        <h3>Inicio de Sesi&oacute;n</h3>
        <h:panelGrid columns="2" cellpadding="7">
            <h:outputText value="Usuario: " />
            <h:inputText id="loginname" value="#{loginController.loginname}" maxlength="16" />
            <h:outputText value="Contrase&ntilde;a: " />
            <h:inputSecret id="password" value="#{loginController.password}" maxlength="16"/>
            <h:outputText value="" />
            <h:commandButton value="Iniciar Sesi&oacute;n" action="#{loginController.CheckValidUser}"    />
        </h:panelGrid>
    </h:form>
</li>

But when run that the page doesn't render the form, anybody can tell me why?