This post aims to demonstrate important Java @annotations used to build a functional Spring Boot REST API. The use of Java annotation gives developers the capability to reduce the code verbosity by a simple annotation.

As an example, we can refer to a transaction. By the standard programmatically process with a transaction template, this requires a more complex config and boilerplate code to write. At the same time, this can be achieved with a simple @Transactional declarative annotation.

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