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OpenCQRS is a lightweight open source Java framework for building applications based on the CQRS (Command Query Responsibility Segregation) and Event Sourcing patterns. It includes built-in support for testing and offers optional Spring Boot integration to simplify configuration and production deployment. OpenCQRS is based on EventSourcingDB, a third-party event store, and provides a Java client SDK for it.
OpenCQRS is available directly from Maven Central. A running instance of the EventSourcingDB is required as event store. Spring Boot developers must add the following dependencies to their project in order to start developing and testing OpenCQRS applications:
Make sure to configure a proper Spring Boot application name and the connection settings for the event store, i.e. within your src/main/resources/application.yml:
Check out our OpenCQRS Sample Applications repository. It provides working example projects that demonstrate how to build applications using OpenCQRS.
