Greetings! This article covers the new, improved method for installing Immutant, and replaces the first in the getting started series of tutorials with Immutant. This entry covers setting up a development environment and installing Immutant. This tutorial assumes you are on a *nix system. It also assumes you have Leiningen installed. If not, follow these instructions, then come back here.

Installing the lein plugin

We provide a lein plugin for creating your Immutant applications and managing their life-cycles. As of this post, the latest version of the plugin is 0.3.1. Check clojars for the current version.

Let's install it as a global plugin:

 $ lein plugin install lein-immutant 0.3.1
Copying 3 files to /a/nice/long/tmp/path/lib
Including lein-immutant-0.3.1.jar
Including clojure-1.2.0.jar
Including clojure-contrib-1.2.0.jar
Including data.json-0.1.1.jar
Including fleet-0.9.5.jar
Including overlay-1.0.1.jar
Including progress-1.0.1.jar
Created lein-immutant-0.3.0.jar

Now, run lein immutant to see what tasks the plugin provides:

 $ lein immutant
Manage the deployment lifecycle of an Immutant application.

Subtasks available:
install    Downloads and installs Immutant
overlay    Overlays features onto ~/.lein/immutant/current or $IMMUTANT_HOME
env        Displays paths to the Immutant that the plugin can find
new        Creates a new project skeleton initialized for Immutant
init       Adds a sample immutant.clj configuration file to an existing project
deploy     Deploys the current project to the Immutant specified by ~/.lein/immutant/current or $IMMUTANT_HOME
undeploy   Undeploys the current project from the Immutant specified by ~/.lein/immutant/current or $IMMUTANT_HOME
run        Starts up the Immutant specified by ~/.lein/immutant/current or $IMMUTANT_HOME, displaying its console output

We'll only talk about the install and run tasks in this article - we covered the application specific management tasks in our second tutorial, and cover overlay in its own article.

Installing Immutant

Now we need to install an Immutant distribution. We've yet to make any official releases, but our CI server is setup to publish an incremental build every time we push to the git repo. The latest incremental build is always available at The previous version of this tutorial walked you through downloading and installing the latest incremental manually, but with the new install task, that's no longer necessary - the install task will download and install the latest incremental build for you. Let's see that in action:

 $ lein immutant install
Extracting /a/nice/long/tmp/path/lib/
Extracted /Users/tobias/.lein/immutant/releases/immutant-1.x.incremental.51
Linking /Users/tobias/.lein/immutant/current to /Users/tobias/.lein/immutant/releases/immutant-1.x.incremental.51

Part of the install process links the most recently installed version to ~/.lein/immutant/current so the plugin can find the Immutant install without requiring you to set $IMMUTANT_HOME. If $IMMUTANT_HOME is set, it will override the current link.

If you want to install a specific incremental build, specify the build number (available from our builds page) as an argument to lein:

 $ lein immutant install 50

You can also have it install to a directory of your choosing (if you want the latest build, specify 'latest' as the version):

 $ lein immutant install latest /some/other/path

~/.lein/immutant/current will be linked to that location.

Running Immutant

To verify that Immutant is properly installed, let's fire it up. To do so, use the lein immutant run command. This is a convenient way to start the Immutant's JBoss server, and will run in the foreground displaying the console log. You'll see lots of log messages that you can ignore - the one to look for should be the last message, and will tell you the Immutant was properly started:

 $ lein immutant run
Starting Immutant via /Users/tobias/.lein/immutant/current/jboss/bin/
(a plethora of log messages deleted)
09:18:03,709 INFO  [] (Controller Boot Thread) JBoss AS 7.1.0.Beta1 "Tesla" started in 2143ms - Started 149 of 211 services (61 services are passive or on-demand)

You can kill the Immutant with Ctrl-C.

Wrapping up

If you've done all of the above, you're now ready to deploy an application. We covered that in our second tutorial.

Since Immutant is still in a pre-alpha state, none of what I said above is set in stone. If anything does change, We'll update this post to keep it accurate.

If you have any feedback or questions, get in touch!