[Seaside] Best-practices/ architectural patters for business apps

[Stefan Krecher]

Hi,
i'd like to know if there are some best-practices/ patterns for
seaside application architectures.
I've been working in JEE Projects in the last approx 10 years - and
there we've got a lot architectural best-practices.
Is there some kind of MVC-Framework like Spring etc in the Java-World?
How are Transactions handled?
Do we have ejb-like components like stateless or stateful session beans?
Or should this not be a seaside-specific question?
regards,
Stefan