In production, in `core.clj`:
</p>

<div class="org-src-container">
<pre class="src src-clojure"><span style="color: #707183;">(</span><span style="color: #a020f0;">ns</span> <span style="color: #228b22;">my-app.core</span>
  <span style="color: #7388d6;">(</span><span style="color: #008b8b;">:gen-class</span><span style="color: #7388d6;">)</span>
  <span style="color: #7388d6;">(</span><span style="color: #008b8b;">:require</span> <span style="color: #909183;">[</span>system.repl <span style="color: #008b8