Spring Boot - Spring Modulith

Apply Spring Modulith guidelines for Spring Boot modular monoliths.

What is covered in this Skill?

• Spring Modulith BOM and starter dependency selection
• Business-capability package structure for application modules
• ApplicationModules verification and architecture tests
• Named interfaces and explicit allowed dependencies
• Domain events for loose coupling between modules
• @ApplicationModuleTest and Scenario-based module integration tests
• Generated module documentation, actuator exposure, and observability
• Event publication registry choices for reliable domain events

Scope: Apply recommendations based on the reference rules, official Spring Modulith documentation, and good/bad examples.

Constraints

Before applying Spring Modulith changes, ensure the project compiles. After improvements, run full verification including module structure tests.