The idea here is to completely isolate domain from infrastructural dependencies allowing one to swap controller, messaging or persistence layer independently.

For example if you are using spring:

• spring-web dependency is added to controllers only
• spring-data dependency is added to persistence only
• spring-cloud-stream dependency is added to messaging only

In future if you wish to replace spring-data with something else then all you have to do is create a new persistence sub-project for it.

1. Packaging of classess becomes a no-brainer. It automatically helps a developer put highly cohesive classes togather. For example: An EventPublisher that will publish events per usecase is placed in the core sub-project. An auditing aspect created to be used on controller methods is placed in the controllers subproject.

2. Your app is CQRS ready from Day 1.