Immutant is an integrated suite of Clojure libraries. It represents an attempt to reduce the incidental complexity inherent in non-trivial applications. The services backed by the libraries include Undertow for web, HornetQ for messaging, Infinispan for caching, Narayana for transactions, and Quartz for scheduling.

There are two major versions of Immutant: 1.x and 2.x (aka The Deuce). The former is no longer under active development. This post explains our motivation for the redesign.

Have questions or want to get involved? Come see us in IRC or join our mailing lists.

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Latest News

An Immutant Plugin For Boot

Wednesday, May 20, 2015
Boot is an interesting new build tool for Clojure from Alan Dipert and Micha Niskin (if you're not familiar with it, Alan & Micha gave a great intro at Clojure/West). To support the... Read more »

Immutant 2.0.1 Patch Release

Monday, May 18, 2015
Despite our best efforts, the 2.0.0 release wasn't perfect. This release fixes the imperfections we're currently aware of. What is Immutant? Immutant is an integrated suite of Clojure libraries backed by Undertow for web,... Read more »

Immutant 2.0.0 Released (FINALLY!)

Friday, April 17, 2015
It was just last April that we announced our plans for the second major release of Immutant, code-named The Deuce. And today, a year later, we're happy to announce the end of our... Read more »

Immutant 2 (The Deuce) Beta3 Released

Monday, April 13, 2015
We're as excited as this puppy to announce The Deuce's very last (we hope!) beta release: Immutant 2.0.0-beta3! We intend to release our final 2.0.0 next Monday during Clojure/West. We would appreciate all interested parties... Read more »


Version 2.0.1 was released on Monday, May 18, 2015. You can read the announcement or browse the documentation.

For usage, see the Installation guide.

Version 1.1.4 was released on Friday, August 1, 2014. You can read the announcement or browse the documentation.

Install via:

$ lein immutant install 1.1.4

Don't have the lein-immutant plugin installed? Learn how, or download the zip archive.

Every push to our git repository generates a build on our CI server. You can view the results of those builds on our 2.x or 1.x incremental build pages.

Upcoming Talks

20 May, 2015
Zürich, Switzerland
Christian Egli will present an overview of Immutant 2.0.0 at the Zürich Clojure User Group

Interested in hosting or giving a talk on Immutant? Get in touch.