Where should “@Transactional” be placed Service Layer or DAO

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Ideally, Service layer (Manager) represents your business logic and hence it should be annotated with @Transactional.

Service layer may call different DAOs to perform DB operations. Lets assume a situation where you have 3 DAO operations in a service method. If your 1st DAO operation failed, other two may be still passed and you will end up with an inconsistent DB state. Annotating Service layer can save you from such situations.

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