Apache Maven Mojo for compiling clojure scripts to class files
Java Clojure
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Welcome to the clojure-maven-plugin plugin for Apache Maven 2.

Available goals

  • clojure:compile
  • clojure:test
  • clojure:run
  • clojure:repl
  • clojure:swank
  • clojure:nailgun

Compiling clojure sources

To use this plugin and start compiling clojure code as part of your maven build, using a default/standard configuration:


Without any additional configuration, the clojure-maven-plugin will compile any namespaces in ./src/main/clojure/.clj and ./src/test/clojure/.clj.

To change, or add additional source directories you can add the following configuration:


NOTE: The plugin will prepend the project's ${basedir} before each source/testSource directory specified.

Temporary Compile Paths

If you wish to take advantage of the compilers syntax checking, but wish to prevent any AOT classes from appearing in the maven generated JAR file, you can tell the plugin to compile to a temporary directory:


The plugin provides a clojure:run goal for run a predefined clojure script defined by:


whilst you could easily launch your tests from the clojure:run goal, the clojure:test goal is more appropriate, without any additional configuration the plugin will generate and execute the following temporary clojure "test launcher" script:

(require 'one.require.for.each.discovered.namespace)
(use 'clojure.test)

(when-not *compile-files*
  (let [results (atom [])]
    (let [report-orig report]
      (binding [report (fn [x] (report-orig x)
                         (swap! results conj (:type x)))]
        (run-tests 'one.require.for.each.discovered.namespace)))
    (System/exit (if (empty? (filter {:fail :error} @results)) 0 -1))))

The generated script requires any discovered test namespaces, runs all the tests, and fails the build when any FAIL or ERROR cases are found.

If you require different test behaviour, you can provide your own test script with the following configuration:


If you wish to limit or filter out namespaces during your compile/test, simply add a <namespaces> or <testNamespaces> configuration section:


The namespace declaration is actually a regex match against discovered namespaces, and can also be prepended with an ! to filter the matching namespace.

If you wish to further limit test/compile usage to only the namespaces you define, you can enable this with the configuration block:


If you want to provide additional arguments to all spawned java/clojure processes, add a <clojureOptions> configuration element. In addition, a <warnOnReflection> configuration element is available as a shortcut to specifying the system property that controls whether or not the AOT clojure compilation process emits reflection warnings:


The plugin can also copy source files to the output directory, filtered using the namespace mechanism that is used to control compilation. If you want to copy all compiled source files to the output:


If you want to copy only a subset:


If you want to do no compilation at all, but copy all source files:


Note that it will only copy clojure source files, which must a) end in .clj and b) contain a namespace declaration.


clojure:run, clojure:repl, clojure:swank and clojure:nailgun goals

clojure-maven-plugin supports four goals intended to make it easier to developers to run clojure shells in the context of maven projects. This means that all dependencies in a project's runtime and test scopes will be automatically added to the classpath and available for experimentation.

By default these goals will use the test classpath, if you wish to only use the compile classpath/dependencies, you can disable this with:


or by running maven with:

Goal Description
clojure:repl Starts an interactive clojure REPL right on the command line. An initialisation script can be specified in the pom using the replScript configuration element.
clojure:swank Starts a Swank server that accepts connections on port 4005 (can be changed using the `-Dclojure.swank.port=X`option). You can connect to this server from emacs with `M-x slime-connect`.
clojure:nailgun Starts a nailgun server that accepts connections on port 2113 (can be changed using the `-Dclojure.nailgun.port=X`option). You can connect to this server from vim using vimclojure (http://kotka.de/projects/clojure/vimclojure.html).
clojure:run Runs a clojure script specified in the pom using the <script> and/or <scripts> configuration element.


In order to run clojure:repl, clojure:swank or clojure:nailgun, your project needs to have a recent (1.0 or later) version of clojure as a dependency in pom.xml.


If JLine is detected in the classpath, it will be used to provide the clojure:repl goal with history, tab completion, etc. A simple way of enabling this is to put the following in your pom.xml:



The clojure:swank goal requires swank-clojure as a projet dependency. Unfortunatly, this library is currently not available in the central maven repository, but is available from clojars by first declaring the repository:


and then declaring the dependency itself:


By default the swank process will run against the local loopback device, if you wish to change the host your swank server runs against, you can configure it via:


or by defining the clojure.swank.host system property.


The clojure:nailgun goal requires a recent version of vimclojure as a dependency. Unfortunatly, this library is currently not available in the central maven repository, and has to be downloaded and installed manually:

  1. Download vimclojure source code from http://cloud.github.com/downloads/jochu/swank-clojure/swank-clojure-1.0-SNAPSHOT-distribution.zip.
  2. Follow the README to compile and install vimclojure.
  3. Locate vimclojure.jar and run the following command to install it to your local repository (replace X.X.X with your version of vimclojure):

    mvn install:install-file -DgroupId=de.kotka -DartifactId=vimclojure -Dversion=X.X.X -Dpackaging=jar -Dfile=/path/to/jarfile
  4. Put the following in your pom.xml (replace X.X.X with your version of vimclojure)



The following options that can be configured as system properties:

Property Default value Description
clojure.nailgun.port 4005 Only applicable for the clojure:nailgun goal. The port number that the Nailgun server should listen to.
clojure.swank.port 4005 Only applicable for the clojure:swank goal. The port number that the Swank server should listen to.
clojure.swank.protocolVersion 2009-09-14 Only applicable for the clojure:swank goal. Specifies the version of the swank protocol.
clojure.swank.encoding iso-8859-1 Only applicable for the clojure:swank goal. Specifies the encoding used by the swank protocol.


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