Help!!! conditional redirect problem

Question

hi,
i have a problem with conditional redirect,
can you help me to find what is wrong with my script.
when i try it on my page. it return an error "java.lang.NullPointerException".
this is what i put on top of my page, i got it from this forum too.
<jsp:scriptlet>
final javax.faces.context.FacesContext facesContext = javax.faces.context.FacesContext.getCurrentInstance();
final com.corejsf.UserBean UserBean=(com.corejsf.UserBean)facesContext.getApplication().getVariableResolver().resolveVariable(facesContext, "UserBean");
if(UserBean.isLoggedIn()==true)
{facesContext.getExternalContext().redirect(facesContext.getExternalContext().getRequestContextPath()+"/index.faces");
</jsp:scriptlet>
this is the boolean that contain my authentication
     public boolean isLoggedIn() { return loggedIn; }
i think the error is in "UserBean.isLoggedIn()".cos when i try "if(1==1)" my page work.
please help me i have been looking solution for this problem about two week now.

Answer 1

thank's for the reply tinashechipomho.
"I dont think this is a good way of login users using JSF."
i'm not using this for login, but to make sure that restricted page will not be able to acces without login.
thank's for the reply pringi.
i don't understand what kind of tag you mention, can you give me example? thank's.
i just found the solution using a jstl tag.
i think the way i call the properties was wrong. so i used a jstl tag to call the properties for if statement.
hope it's usefull.
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<c:if test="${sessionScope.user.loggedIn!=true}">
     <jsp:scriptlet>
          final javax.faces.context.FacesContext facesContext=javax.faces.context.FacesContext.getCurrentInstance();
          facesContext.getExternalContext().redirect(facesContext.getExternalContext().getRequestContextPath()+"/index.faces");
     </jsp:scriptlet>
</c:if>