How to launch a clojure repl with access to a jar

Question

I'm new to clojure. I have a jar file I want to play with in a clojure repl, but I've failed to do so with leiningen 2. I have tried placing the jar file in src/myjar.jar and also in src/org/mydomain/myjar.jar When I run lein repl I get errors stating that leiningen can not find my artifact, and a reference to a page about repeatability which I do not understand. Here is my project.clj (with the real name of myjar) ``` (defproject cljliveordead "0.1.0-SNAPSHOT" :description "FIXME: write description" :url "http://example.com/FIXME" :license {:name "Eclipse Public License" :url "http://www.eclipse.org/legal/epl-v10.html"} :dependencies [[org.clojure/clojure "1.3.0"] [org.allen.temporalintervalrelationships/time "0.2" :extension "jar"]]) ```

Accepted Answer

You can use local jars using the lein-localrepo plugin. Add this line to your project.clj

```
:plugins [[lein-localrepo "0.4.0"]]
```

Then install the jar to the local repository using

```
lein localrepo install <path-to-jar> org.allen.temporalintervalrelationships/time 0.2
```

You can check that the file is installed by running `lein localrepo list` and check that lein can resolve the project dependencies using `lein deps`. If all is well then you can start playing with the jar using `lein repl`.

Leiningen doesn't like local jars due to its goal of repeatable builds. If this was a real project using a third party closed source jar then the best thing to do is install it in a local Nexus repository and add a reference to that repository to your project.

However, this all seems a bit heavyweight for what you are trying to achieve. If all you want to do is play with the jar in the REPL then create a simple project like this

```
(defproject clojure-time "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [com.cemerick/pomegranate "0.0.13"]])
```

and use the pomegranate library to add the jar to your classpath manually

```
(require '[cemerick.pomegranate :as p])
(p/add-classpath "jsr-310-ri-0.6.3.jar")
(javax.time.Instant/now)
```

and play away.

How to launch a clojure repl with access to a jar

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