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The Stpring team recommends that you annotate only concrete classeds with the @Transactinal annotation as apposed to annotating interfaces. you certainly can place the @Transactional annotation on an interface( or an interface method), but this works only as you would expect it to if you use inferface-based proxies. 1. @Transactional은 interface보다는 구체 class에 사용하는 것을 권장 2. interface는, interface-ba..