jar-copier is a Leiningen plug in to copy jars from your dependencies to your source tree. It’s a very small simple utility that proved to be necessary to have a sane setup with Java agents (New Relic for example).

It’s very simple to use. Put [jar-copier “0.1.0”]  into the :plugins  vector on your project.clj. To run this plug in, execute:

$ lein jar-copier

If you want the task to run automatically, which is recommended, add:

:prep-tasks ["javac" "compile" "jar-copier"]

and it’ll be invoked every time you build your uberjar.

You need to configure the plug-in in your project.clj like this:

:jar-copier {:java-agents true
             :destination "resources/jars"}

:java-agents instruct this plug in to automatically copy any jars that are specified as Java agents. :destination  specifies where to copy them to.

For example, from proclodo-spa-server-rendering:

(defproject proclodo-spa-server-rendering "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.7.0"]]
  :plugins [[jar-copier "0.1.0"]]
  :prep-tasks ["javac" "compile" "jar-copier"]
  :java-agents [[com.newrelic.agent.java/newrelic-agent "3.20.0"]]
  :jar-copier {:java-agents true
               :destination "resources/jars"})

Photo by Maik Meid

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