Java EE 5 - Rethinking Best Practices, Idioms and Patterns

Java EE 5 changed the landscape and opened new architectural possibilities to the developers - it can be used for building domain driven, as well as serviceoriented applications. Especially the EJB 3.X components massively reduced the overhead and became surprisingly lean and DRY. Some Best Practices in J2EE are superflous now - some can be even considered as anti-patterns.Questions like: