Exception with SessionAware???

[Security Management]

Struts 2.1, every time the LoggedInInterceptor runs, I get the null pointer
exception.  Any ideas:

Struts.xml:
<struts>
  <include file="struts-default.xml"/>
        <constant name="struts.objectFactory"
value="org.apache.struts2.spring.StrutsSpringObjectFactory" /> 
  <package name="default" extends="struts-default">

                <interceptors>
                        <interceptor name="loggedIn"
class="com.secmgmt.struts2.interceptors.LoggedInInterceptor"/>
                        <interceptor-stack name="defaultLoggedInStack">
                                <interceptor-ref name="createSession"/>
                                <interceptor-ref name="defaultStack"/>
                                <interceptor-ref name="loggedIn"/>
                        </interceptor-stack>
                </interceptors>

                <default-interceptor-ref name="defaultLoggedInStack" />

And so on...

Interceptor:

import com.opensymphony.xwork2.interceptor.Interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;

import java.lang.StringBuffer;
import java.util.Map;
import java.util.Iterator;
import java.util.Enumeration;

import javax.servlet.http.HttpSession;

import org.hibernate.criterion.Restrictions;
import org.hibernate.Criteria;
import org.hibernate.Hibernate;

import com.secmgmt.picture.four.database_beans.*;
import com.secmgmt.util.HibernateSpringConnector;

import org.apache.struts2.interceptor.SessionAware;

import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;

// Extend ActionSupport for the getText(String) method.
public class LoggedInInterceptor extends ActionSupport implements
Interceptor, SessionAware
{
    HibernateSpringConnector hsc;
    Map<String, Object> session;
    Logger l;
    
    public void setSession(Map<String, Object> s)
        {
            this.session = s;
        }

    public Map<String, Object> getSession()
        {
            return this.session;
        }

        /**
         * We let the Spring IOC stuff give us the HibernateSpringConnector
for the database
         * connection.
         */
    public void setHibernateSpringConnector(HibernateSpringConnector h)
        {
            this.hsc = h;
        }

    public HibernateSpringConnector getHibernateSpringConnector()
        {
            return this.hsc;
        }
    
    public void init()
        {
            l = Logger.getLogger(LoggedInInterceptor.class.getName());
            l.warn("Logger setup");
        }

    public void destroy()
        {
            l = null;
        }

    public String intercept(ActionInvocation ai) throws Exception
        {
            if(this.getSession() == null)
            {
                throw new Exception("Session is null");
            }
            
            if(this.getSession().get("username") != null)
            {
                String res = ai.invoke();
                this.getHibernateSpringConnector().closeSession();
                return res;
                    
            }
            else
            {
                return "login";
            }
        }
}




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