Ecosystem architecture and boundaries

This diagram describes repository and runtime responsibilities. It does not imply that every node is a stable release; check the catalog for status.

Verified boundaries

• The five implementation repositories are currently private and under active restructuring; no public Maven artifact is advertised yet.
• The local ddd4j baseline targets Java 17 and separates plain Java contracts from runtime-specific auto-configuration.
• The module set covers aggregates, repositories, typed queries, domain events, CQRS, architecture rules, data, messaging, web, auth, and cache abstractions.

Suggested reading order

1. Find the entry point closest to your use case in the diagram.
2. Confirm whether the repository is public, a private preview, or archived.
3. Open its README and confirm API, version, tests, and license.
4. Run the smallest verification from Getting Started before business integration.