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.
Servlets are part of J2EE, so you can always get the UserTransaction from JNDI and manage your transaction yourself. At that point, you get your DataSource from JNDI and it magically joins the transaction, etc.