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The Clojure Programming World: Libraries and Other Tools

With the vibrant community, the Clojure language has a good core of libraries, collections, and other ready-to-use tools. According to a 2019 survey, 25% of Clojure users create or maintain open source solutions. Some programmers also check and fix issues (17%), or report on them (15%).

Clojure users
Closure Users per SurveyMonkey

Although all these libs aim to simplify Clojure programming tasks, they may confuse a beginner. Sometimes, it’s difficult to understand how to put all of them together and find an optimal solution for a specific task. So, now I want to show you my favorite tools for programming in Clojure. We will talk about:

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No Framework for Your Microservices?

Axon Framework is an open source framework frequently used for building event-driven microservices on the JVM. Its architectural concepts are CQRS (Command Query Responsibility Segregation), DDD (domain-driven design), event sourcing, and location transparency.

The choice of using a framework for application development is somewhat controversial. You might have a look at this blog by Peter Kummins, which argues against the use of frameworks in general. More specific to the field in which my organization, Axon operates, father-of-CQRS Greg Young is known for advising “don’t write a CQRS framework,” and DDD authority Mathias Verraes recommended on Twitter not to use a framework for applications that have to last multiple years. This article by Tomas Petricek makes some other interesting points, clearly distinguishing between libraries and frameworks, and advocating for the use of libraries over frameworks.