This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Venkat, Most of J2EE appservers support SPNEGO feature, which would pass you the client's logon credentials to J2EE application. You should be able to find the necessary configuration document, specific to your appserver.