title: package org.apache.commons.lang does not exist [Netbeans]
body: <p>Am new to programming with basic knowledge and I've taken a liken to Java.<br>
  I wanted to write a code that calculates a number to the nth power without using loops. I've been trying to use the repeat method from "commons lang" which i came to know about, about 4 days ago. I Found a lot of info in this site and others that helped me in understanding how to use this packed.<br>
  So far I downloaded commons-lang3-3.1 then kept the folder in the same folder as my project and added the jar file to my project's library by:-  </p>
  
  <p>right clicking on libraries<br>
  1 then Add JAR/Folder<br>
  2 then i opened the commons-lang3-3.1 folder<br>
  3 and selected "commons-lang3-3.1.jar" from a number of 4 selections:</p>
  
  <ul>
  <li>commons-lang3-3.1.jar
  
  <ul>
  <li>commons-lang3-3.1-javadoc.jar  </li>
  <li>commons-lang3-3.1-sources.jar  </li>
  <li>commons-lang3-3.1-tests.jar  </li>
  </ul></li>
  </ul>
  
  <p>here is a code that am using to test that i got from one of the the other questions:-  </p>
  
  <pre><code>0. package refreshingmemory;
  1. import org.apache.commons.lang.StringUtils;
  2. public class RefreshingMemory {
  3.
  4.     public static void main(String[] args) {
  5.         String str = "abc";
  6.         String repeated = StringUtils.repeat(str, 3);
  7.         repeated.equals("abcabcabc");
  8.
  9.        }
  10.    }
  </code></pre>
  
  <p>line 1 says <strong>package org.apache.commons.lang does not exist</strong>.<br>
  line 7 says <strong>Should check the method return value</strong><br>
  and if i remove line 1 i get a <strong>cannot find symbol</strong> at line 6<br>
  <strong>How do I get a successfully import ?</strong></p>
  
  <p>Screenshot of Netbeans:</p>
  
  <p><img src="https://i.stack.imgur.com/nNb2l.png" alt="enter image description here"></p>