spring has command pattern based aop also

It is not easy to say it is a good thing or a bad thing, just a note here: spring.net’s DAO stuff is not emit-based (i.e., fine-grained) aop, it is not even IoC based. They are command pattern based.

It is good, because you have all the skill set in case you have to do aop without emit; it is bad, because it is not elegant – emit-aop can handle it much cleaner.

It is inherited from Java spring, which was pre-aop-is-in-age.