Question

I’m trying to make a custom lein task called migrate, so I can say on the command line:

lein migrate

lein finds my task file under src/leiningen/migrate.clj (as per the leiningen convention). In the ns declaration for the task I have a require for a file from my project

(ns leiningen.migrate
  (require [triface.migration :as mm]))

(defn migrate []
  (mm/run-migrations))

It finds src/triface/migration.clj fine, but THAT file requires a file that requires jdbc:

(ns triface.db
  (:require [clojure.java.jdbc :as sql]))

This call works fine in my application, but from this lein task it fails with the following error:

Exception in thread "main" java.io.FileNotFoundException: 
Could not locate clojure/java/jdbc__init.class or clojure/java/jdbc.clj on classpath

What is going on here? Thanks!

Answer 1

The classpath is slightly different.
To use it as is, you must define :dev-dependencies in your project.clj file.

For example,

:dev-dependencies [[org.clojure/java.jdbc "0.0.4"] ]

Then, the jar file is loaded properly.

(ns triface.migration
  (:require [clojure.java.jdbc :as sql]))

 (defn run-migrations[]
   "hello")