title: I can't import custom jar files to NetBeans project
body: <p>I'm a learner in Coursera learning Java. They provide us with some libraries to help in  learning, and they work on BlueJ, but I love NetBeans, so I tried to add these jar files to it. I did the following.</p>
  <ol>
  <li>Create new project</li>
  <li>Go to <code>tools&gt;libraries</code></li>
  <li>Add a new section called &quot;Coursera&quot;</li>
  <li>Add a jar files in it</li>
  <li>Go to the main class</li>
  <li>Import some classes &amp; add methods to test, but as you can see in the screenshot below, it gives me the error &quot;package does not exist&quot;. What is wrong?</li>
  </ol>
  <p>This is the screenshot from NetBeans:</p>
  <p><a href="https://i.stack.imgur.com/cTxPs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cTxPs.png" alt="NetBeans screenshot" /></a></p>
  <p><a href="https://i.ibb.co/4Kv6Kd1/Screenshot-20210323-163156.png" rel="nofollow noreferrer">https://i.ibb.co/4Kv6Kd1/Screenshot-20210323-163156.png</a></p>
  <p>These are the jar files:</p>
  <p><a href="https://www.dukelearntoprogram.com/downloads/archives/courserajava.jar" rel="nofollow noreferrer">https://www.dukelearntoprogram.com/downloads/archives/courserajava.jar</a></p>
  <p><a href="https://www.dukelearntoprogram.com/downloads/archives/apache-csv.jar" rel="nofollow noreferrer">https://www.dukelearntoprogram.com/downloads/archives/apache-csv.jar</a></p>
  <p>I'm using NetBeans 12.3 on Archlinux.</p>