Using local jar files with emacs clojure/cider mode and REPL - emacs

Question

I'm trying to use functions from other jar files.
Creation of local jar file
I downloaded sample sources from the book Programming Clojure 2nd Ed, and created a jar file with lein jar command.
Use the local jar file
From the hints in this post, I copied the jar file in lib/ directory, then I could add
:resource-paths ["lib/programming-clojure-1.3.0.jar"] in the project.clj.
Test in REPL
With lein classpath command, I could check that the jar file is in class path.
With lein repl, I could use the functions in the jar file.
mire=> (require '[examples.introduction :as e])
nil
mire=> (take 10 examples.introduction/fibs)
(0 1 1 2 3 5 8 13 21 34)
Isses with emacs/cider
I created a t.clj source in the src/ directory, launched emacs with emacs src/t.clj &, and started REPL with M-x cider-jack-in.
I wrote this code, and executed it with C-x C-e.
(ns t
(:require '[examples/introduction :as ex]))
However, I got a message that the file is not found.
java.io.FileNotFoundException: Could not locate introduction__init.class or introduction.clj on
classpath:
What might be wrong?

Answer 1

The namespace is examples.introduction. Also, you don't need to quote the vector inside the ns macro. Try:
(ns t
(:require [examples.introduction :as ex]))
See some examples of use for the ns macro here.
Also, it's customary to have at least two segments in namespaces. Yours could be mynamespace.t for example.