Why Package Structures Won't Save Your Spring Boot Architecture (And How Maven Enforces It) (Chapter 1)

Short summary

The article argues that Java package-based separation provides only an illusion of architectural control and demonstrates how splitting a Spring Boot application into specialized Maven modules turns architectural guidelines into compilation errors. By isolating business logic from infrastructure modules (JPA, Hibernate, Kafka), developers physically cannot bypass layers without explicitly adding forbidden dependencies. The approach includes extracting API contracts into a separate Git repo and using Maven's dependency rules to prevent cyclic dependencies and enforce anti-corruption layers.

• •Package-based architecture is insufficient—Maven module separation enforces boundaries at compile time
• •Business logic module is isolated from all infrastructure frameworks, preventing direct DB or external service access
• •API contracts live in a separate Git repo for independent versioning and stable frontend/QA integration

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