NullPointerException in initSessionInfo()

Hello,

We are configuring Single Sign-on in weblogic 92 with Active diectory. We do
have followed all the steps for SSO from bea doc
"http://edocs.bea.com/wls/docs92/secmanage/sso.html#wp1101439"

SSO works fine with our application Jaas login module, but while trying to load
data to GUI thro Axaj it fails at initSessionInfo().

Error Trace:
java.lang.NullPointerException
        at
weblogic.servlet.internal.ServletRequestImpl$SessionHelper.initSessio
nInfo(ServletRequestImpl.java:2285)
        at
weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSession
Internal(ServletRequestImpl.java:2067)
        at
weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSession
(ServletRequestImpl.java:2057)
        at
weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSession
(ServletRequestImpl.java:2053)
        at
weblogic.servlet.internal.ServletRequestImpl.getSession(ServletReques
tImpl.java:1185)


Any ideas?

Thanks in advance,