title: User Plugin in Artifactory not loading
body: <p>I have Artifactory 6.20.1 running in a Docker container. I'm trying to install the artifactCleanup plugin (<a href="https://github.com/jfrog/artifactory-user-plugins/tree/master/cleanup/artifactCleanup" rel="nofollow noreferrer">https://github.com/jfrog/artifactory-user-plugins/tree/master/cleanup/artifactCleanup</a>)</p>
  <p>I have put the artifactCleanup.groovy file in the corresponding folder:</p>
  <pre><code>$ ls -all /opt/jfrog/artifactory/var/etc/artifactory/plugins/
  total 36 
  drwxr-xr-x 2 artifact artifact  4096 Feb 24 10:28 . 
  drwxr-xr-x 3 artifact artifact  4096 Feb 23 15:24 .. 
  -rwxr-xr-x 1 artifact artifact  5829 Feb 23 15:25 README.md 
  -rwxr-xr-x 1 artifact artifact 14043 Feb 23 15:26 artifactCleanup.groovy 
  -rwxr-xr-x 1 artifact artifact   325 Feb 24 10:28 artifactCleanup.json 
  </code></pre>
  <p>However if I'm trying to see my loaded plugins I get an empty response</p>
  <pre><code>curl -X GET -u &quot;admin:password&quot; http://localhost:8081/artifactory/api/plugins
  {}
  </code></pre>
  <p>The Server has been restarted before running that request. All commands have been running inside the Docker container. I have been looking at the documentation (<a href="https://www.jfrog.com/confluence/display/JFROG/User+Plugins" rel="nofollow noreferrer">https://www.jfrog.com/confluence/display/JFROG/User+Plugins</a>) on how to install plugins. My User account which was used for the rest calls is an admin account.</p>
  <p>Now I am out of clues, why that plugin is not loading?</p>