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@Transaction annotation in dao or service layer ?

 
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where is the best approach to put @Transaction annotation ? dao or service layer ?

 
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Depends.

Personally, I make my services transactional, my DAOs not--that way I don't need to nest transactions inside a service if I use multiple DAO calls. Of course, I also make my services implement the same interface my DAOs do, which some people find very annoying and redundant :)
 
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Services and only when necessary.



This is a total waste of a transaction since no other db writes are being made.
 
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