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With the arrival of Java EE and EJB 3,
have any of these Core J2EE Patterns become obsolete, or stand deprecated in light of (better) alternatives?
Are there any new patterns that one could use?
Adam Bien has written an excellent book “Real World Java EE Patterns – Rethinking Best Practices” just about this (i.e. updating J2EE patterns to Java EE 5/6). You can see a an overview of the changed and updated J2EE patterns in my Summary of the Real World Java EE Patterns.