What this material helps you review.
Use this material when a Java backend works, but the team is unsure whether responsibilities, contracts, logs and deployment signals are clear enough for maintenance.
- Controller, service and repository responsibilities.
- DTOs, validation and separation between API contract and persistence model.
- Global exception handling and consistent response patterns.
- OpenAPI, logs, tests, environment variables and deployment checks.
- Signals that indicate when a deeper technical diagnosis is needed.