Where to put @Transactional? In interface specification or implementation? [duplicate]

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It really all depends on your application architecture, in my opinion. It depends on how you are proxying your classes. If you have your app set to proxy-target-class="true" (in your application context, then your @Transactional information wont be picked up if you annotate the Interface.

Check out The Spring Docs — “Tips” for more information.

Spring recommends that you only annotate concrete classes (and methods of concrete classes) with the @Transactional annotation, as opposed 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 are using interface-based proxies. The fact that Java annotations are not inherited from interfaces means that if you are using class-based proxies (proxy-target-class=”true”) or the weaving-based aspect (mode=”aspectj”), then the transaction settings are not recognized by the proxying and weaving infrastructure, and the object will not be wrapped in a transactional proxy, which would be decidedly bad.

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