Clojure Uberjar not loading resource file

Question

I use lein uberjar to create a standalone jar of an application.

When executing

java -jar dataloader-0.1.0-SNAPSHOT-standalone.jar,

Answer 1

If you want to read the content of the configuration.json file, do not call io/file. Instead, use slurp function, like that:

(def config (slurp (io/resource "configuration.json")))

Answer 2

clojure.java.io/resource returns a URL, not a file. That's why you can call slurp on it. The error message is telling you that it's not a file, unfortunately it's not telling you that it's a URL.

Of course you could open the url with the java.net.URL api although that would be overkill in this case.