Tactical DDD with Java

This repository contains sample code for my "Tactical DDD with Java" workshop. It consists of 4 modules that showcase different aspects of how to write architecturally evident code with jMolecules and structure applications with Moduliths.

1. DDD Building Blocks and structural validation

Showcases…

• … how using jMolecules DDD abstractions in a domain model allow to verify rules originating from the concepts expressed via jMolecules ArchUnit integration.

2. Out of the box port integration for jMolecules types

Showcases…

• … value types and identifiers working as their primitive values in JSON representations using jMolecules Jackson integration.

3. Reducing boilerplate code for persistent models

Showcases…

• … the use of jMolecules' ByteBuddy plugin to default the JPA mappings to follow the aggregate structure expressed in the model.

4. Building low-coupled modules using Spring Modulith

Showcases…

• … the package convention to define logical modules.

• … strictly models cross-aggregate references as jMolecules Associations.

• … using domain events to implement interaction between modules and avoid bean references across module boundaries.

• … implementing tests that verify business functionality around the published and consumed events.

• … the use of Spring Modulith’s Documenter to create documentation around the module structure, relevant components of each module and their interaction.