TS CSSDK Customization issue

System

Hi All,
We are in the process of upgrading Teamsite from 6.7.1 to 7.2.1 and from win2K3 to win2K8. The CSSDK version is also upgraded to 3.1

Whatever customizations we had done using java servlet by using CSClient in the older enviroment is failing in the newer environment. It looks like the failure is very specific to

CSClient client = (CSClient) request.getAttribute("iw.csclient");

This throws a nullpointer exception in the servlet.

After mucking around with the samples provided in CSSDK client I am able to get some of the samples working using the
CSClient client = factory.getClientForTrustedUser(....)
the factory is loaded using CSJavaFactory

But for some reason I cannot get the CSClient object reference using request.getAttribute in the servlet. Does anyone have any exposure to CSSDK customizations on 7.2.1? Any help or pointers is greatly appreciated.

Thanks