EJB 3.0
Java.net has a great article on how to migrate EJB 2.x beans to EJB 3.0. EJB 3.0 is definitely an improvement over the overly complicated EJB 2.x specifications, especially the arrival of dependency injection over the potentially evil dependency lookup mechanism. Although I think it’s a little too late in comparison to the advance support of dependency injection in Spring and the uptake of the high-level APIs that builds on top of it.
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