How to require a jar file in Clojure REPL?

Question

It's easy to require a package from clojure:

user=> (require 'clojure.core)
nil

But how can I require a .jar file inside Clojure?

(I'm trying to learn lein. Leiningen is useful to big projects rather than small scripts. So I want to figure out that what's the best method to use a jar package in my Clojure scripts and in REPL.)

Answer 1

Although it's possible to add a jar to an application at runtime with the help of the Pomegranate library, it's highly discouraged as:

1. It hides the dependency from the outside, and end users won't know they need it to run the code.
2. The jar itself can depend on other jar files (and hence put strain on end users to figure it out)

I think I'm repeating the other respondents, but thought I'd add the points to validate their advices.

As a matter of fact, lein2 uses pomegranate under the covers, just for the purpose of not having to restart REPL after a dependency is needed. It's only for development purposes.

Answer 2

I don't think you can. The REPL has to be started with the JAR on the classpath.

Answer 3

Have a look at the Pomegranate library.