Review

[mpe85]

General points:

• The project has a good package structure that separates different concerns (configuration, core/domain, core/respository, core/services, web).
• Lombok is used to redure boilerplate code.
• JavaDoc is missing in all places. This would help to understand the purpose of each class and method.
• API documentation in CouponResource is missing.
• API security is missing at all.
• Most dependencies including gradle itself are outdated and should be kept up-to-date to avoid vulnerabilities and bugs.
• There are unit tests only for the CouponService. Other classes like entities, DTOs, repositories, controllers could be unit testes as well.
• Other kinds of tests like integration or e2e test are missing at all.