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What is considered the best practice in placing the @Transactional annotation? Should I annotate the interface method or the implementation?
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Putting @Transactional requires Spring libraries in the API section, which IMHO is not effective. So I prefer to add it in the Implementation where the transaction is running.
The @Transactional annotation belongs to the Service layer because it is the Service layer's responsibility to define the transaction boundaries.
In case 1 @Transactional is applied to every public individual method. Private and Protected methods are Ignored by Spring. Spring applies the class-level annotation to all public methods of this class that we did not annotate with @Transactional.
Annotation Type Transactional. Describes a transaction attribute on an individual method or on a class. When this annotation is declared at the class level, it applies as a default to all methods of the declaring class and its subclasses.
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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