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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?
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What's more, 2% of developers reported that they still use J2EE and, even though this seems like a very small percentage, it is a significant number as it is almost equal to the number of people that use Scala as their main application language!
The J2EE design patterns pioneered by Sun Microsystems are a set of best practices for solving recurring design problems. Patterns are ready-made solutions that can be adapted to different problems, and leverage the experience of successful J2EE developers.
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.
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