Introduction

This section of the reference guide intends to cover in detail the capabilities that the Axon Framework provides to help build applications based on CQRS/DDD and Event Sourcing

Breaking Changes in Axon Framework 4.7!

Against our normal approach towards minor releases, we sadly had to introduce breaking changes between Axon Framework 4.6 and 4.7. Our apologies for this.

To help you with your upgrade we have constructed a dedicated page here that helps you on your path to upgrade to 4.7. If you find any irregularities concerning your upgrade, be sure to reach out to us!

A summary of the various sub-sections is given below.

Sub-Section	Purpose
Upgrading to 4.7	Step plan explaining how to upgrade to Axon Framework 4.7
Messaging Concepts	Conceptual overview of "Messages" within the Axon Framework
Commands	Command Message Development using the Axon Framework
Events	Event Message Development using the Axon Framework
Queries	Query Message Development using the Axon Framework
Sagas	Long Running Transaction development using the Axon Framework
Testing	Testing capabilities provided by the Axon Framework
Serialization	Details on the serialization capabilities provided by the Axon Framework
Tuning	Tuning capabilities provided by the Axon Framework
Monitoring and Metrics	Monitoring and Metric capabilities provided by the Axon Framework
Spring Boot Integration	Axon Framework integration with Spring Boot
Modules	Modules provided by the Axon Framework