title: Add the jar files from Apache Package on Eclipse
body: <p>My question is the same as the ones <a href="https://stackoverflow.com/questions/4706212/install-apache-package-on-eclipse">here</a> and <a href="https://stackoverflow.com/questions/6826195/import-org-apache-error-http-client">here</a>, and several other links.
  I want to use a class which imports </p>
  
  <pre><code> org.apache.commons.math3.stat.regression.SimpleRegression
  </code></pre>
  
  <p>I did the following: I downloaded both the binary and source from <a href="http://hc.apache.org/downloads.cgi" rel="nofollow noreferrer">here</a> HttpClient 4.2.3 (GA). In the lib directory, there were several jar files, I added them all to the project, and then followed the answer given <a href="https://stackoverflow.com/questions/4706212/install-apache-package-on-eclipse">here</a>.<br>
  Still, the Eclipse does not recognize the </p>
  
  <pre><code>org.apache.commons.math3
  </code></pre>
  
  <p>What have I done wrong?<br>
  Thanks a lot. </p>