There is an ongoing debate about best practices for configuration management between XML configuration with schema support versus Annotational meta data. I can make a valid argument either way so the choice really depends on each case and context. That said, I have been on large-scale enterprise migration project recently and having been 50% of the decision in that case to go with xml configuration over Annotations for the right reasons, now that the new, migrated application is getting huge,
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JEE Application Configuration with Spring and Java Annotations
