RND-38: implement initial Spring Boot project with 3 layered architecture#9
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Implementing an example of 3 Layered Architecture using Spring Boot 3.
The application golden-example consists of next sub-modules:
On the other hand service and repository modules also contain an api and impl submodules.
In the api modules, we have only interfaces defined for importing into the higher modules (like service-api module was imported into the controller module) which allows us to restring access from higher modules to actual implementation forcing them to use interfaces instead.
This structure allows us dynamically switch the implementation of some specific modules without changing higher modules.
In this project, we can easily change between different implementations of the repository layer which allow us to migrate, for example from using MySQL DB and JPA implementation to Postgres DB and JOOQ implementation by just changing the profile from mysql-jpa-repository to postgres-jooq-repository in
application.yamlor with the appropriate property during startup.The project also contains docker folder with
docker-compose.yamlfile for easily spinning up DBs locally for testing.For starting the application we have exe module which contains all submodules from the application for adding them to jar and context.