Simple CQRS with Axon

This is a port of the application from axon-quick-start application intended as a quick intro to the Axon framework.

The difference is that I've tried to simplify some things.

• There is still axon-spring-boot-starter starter
• There is no Axon server. The application is completely standalone.
• There is no Event Sourcing. All aggregates (states) are persisted as JPA entities at the end of each domain event processing.
• Since there is no Event Sourcing there is no need for an EventStorageEngine.
• Everything (aggregates, projections) is persisted into the in-memory H2 database.

The idea is to see what minimal beans need to be declared to make this scenario work.

• We still need to declare and configure an instance of org.axonframework.commandhandling.SimpleCommandBus
• We also need an instance of org.axonframework.eventhandling.SimpleEventBus
• The rest of the infrastructure is wired by the starter

Copyright disclaimer and acknowledgements

This code is based heavily on the code for the axon-quick-start exercise (and the solution).