how to implement logout process in JSF application

how to impl开发者_如何学Goement logout process in JSF application

---

public String logout() {
    ((HttpSession) FacesContext.getCurrentInstance().getExternalContext()
         .getSession()).invalidate();
     return "homePage";
}

and

<h:commandLink value="#{msg.logout}" action="#{logoutBean.logout}" />