Storm and Kafka are great building blocks for event streaming and processing, but if you're interested in a very well designed and non-opinionated framework for

Storm and Kafka are great building blocks for event streaming and processing, but if you're interested in a very well designed and non-opinionated framework for Java that helps you build CQRS applications, Axon[1] is worth looking into. The creator and maintainer, Allard Buijze is a great guy (and he is paid to maintain it) and the code base is very solid with improvements being made on a regular basis. [1] http://www.axonframework.org/ http://www.axonframework.org/