ddd-da-massa

You implement DDD in Jakarta EE by designing cohesive controllers, rich entities, and form value objects to balance cognitive load across web layers and improve maintainability.

High cognitive load in Java web architecture occurs when business logic scatters across layers. Reduce it by embedding logic inside rich entities and merging controller and service responsibilities for clear flows.

A cohesive controller in Domain-Driven Design is a controller that uses 100% of its injected dependencies. This ensures tight architecture cohesion and prevents unnecessary complexity across Jakarta EE layers.

Create smart DTOs by designing form value objects that convert themselves to domain objects. This encapsulates mapping logic and keeps domain layers clean within Jakarta EE web applications.

You can merge domain services and controllers in Jakarta EE for small, clear flows. This Domain Service Controller pattern combines responsibilities to streamline processing and reduce architectural overhead.

Rich entities embed business logic to enforce invariants, but may introduce tight coupling if overused. Limit them to core domain concepts and use domain service controllers for complex cross-entity flows.