using Java EE

[Zohar]

Hello, I'm really new to Java EE, and I have some general questions. I need to have a server that handles clients (well, that's what servers usually do...). I need client sessions to be persistent, so that if a session is terminated (e.g., due to server failure), the session can be continued by another server. I think this requires sessions to be written to DB. Can anyone also explain what is meant by "transaction management" in Java EE? If this is no an appropriate forum, please point me to a better place where I can get information. Thanks, Zohar.