Spring Boot Architecture — PerfectJob

Spring Boot Hexagonal architecture separates a pure domain core from external interactions using well-defined inbound and outbound ports, alongside dedicated adapters, to minimize framework dependencies within a modular monolith.

The best way to isolate a pure domain core in a Java 21 backend is applying Hexagonal architecture within a modular monolith, ensuring business logic remains independent of Spring Boot 3.4 framework dependencies via defined ports and adapters.

Yes, the modular monolith approach works with Spring Security and JWT. The architecture integrates Spring Security and JSON Web Tokens to handle authentication and secure application lifecycle boundaries within the Spring Boot 3.4+ environment.

Yes, you can use Flyway and PostgreSQL for data persistence in a Hexagonal Spring Boot project. The architecture supports database migrations via Flyway and manages persistence through PostgreSQL outbound adapters connecting to the pure domain core.

To structure feature-based packages in a Spring Boot 3.4 monolithic application, you organize modules by business domain. Each module contains its own pure domain core, ports, and adapters, creating a modular monolith that isolates features cleanly.