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for as7 that would be MSC for services +DMR management.
fastest way to getting into that is by creating extension https://docs.jboss.org/author/display/AS71/Extending+JBoss+AS+7
As Ales said there is still POJO support in as7 but it is not core thing but just one of the subsystems (extensions).
I would recommend you to join #jboss-as7 where most of developers hang to help you explain understand what and how things are done.