error in HttpSessionFacade when working with Apache/Tomcat 3.2

[Hanusch, Hartwig]

Hi there,

does anybody know why a servlet works fine with tomcat only (port 8080) 
but when using apache/tomcat via jk_mod (or old jserv) the servlet throws
an error like that:

java.lang.NullPointerException:
        at org.apache.tomcat.facade.
                HttpSessionFacade.getId(HttpSessionFacade.java:114)
...

the calling code looks that way:

session is hash of sessions

for (Iterator i = sessions.iterator(); i.hasNext(); )
{
        HttpSession theHttpSession = (HttpSession) i.next();
        String sid = theHttpSession.getId();            <---- problem,
calling HttpSessionFacade ....
        if (loginObj.hasContentSessionRelatedBlaSession(sid) != true)
        {
                tmpVec.add(theHttpSession);
        }
}

Could that be a configuration error? Doesnt seems like?! Any ideas?
When looking at the HttpSession the stored session in memory seem to mix up!

Happy to here from anybody
Cheers Hartwig