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.
Each lookup will create a new stateful bean instance. So effectively, your two servlets are using different instances of the stateful bean. If you want to see the same state between those servlets, then you should be sharing one instance of the stateful bean.