CQRS is simpler than you may think

You can also watch the talk below:

Repository with backing code for my talk. For more samples like that see EventSourcing in Java repository.

Read also

• 📝 CQRS facts and myths explained
• 📝 What onion has to do with Clean Code?
• 📝 How to slice the codebase effectively?
• 📝 Generic does not mean Simple?
• 📝 Can command return a value?
• 📝 How to register all CQRS handlers by convention

Prerequisites

1. Install git - https://git-scm.com/downloads.
2. Install Java JDK 17 (or later) - https://www.oracle.com/java/technologies/downloads/.
3. Install IntelliJ, Eclipse, VSCode or other preferred IDE.
4. Install docker - https://docs.docker.com/engine/install/.
5. Open project folder.

Running

1. Run: docker-compose up.
2. Wait until all dockers got are downloaded and running.
3. You should automatically get:
   • PG Admin - IDE for postgres. Available at: http://localhost:5050.
     • Login: admin@pgadmin.org, Password: admin
     • To connect to server Use host: postgres, user: postgres, password: Password12!
4. Open, build and run ECommerceApplication.
   • Swagger should be available at: http://localhost:8080/swagger-ui/index.html

See also .NET version of those samples.