title: Can't import ArrayUtils on Intellij
body: <p>So when i try to do this:</p>
  
  <pre><code>import org.apache.commons.lang3.ArrayUtils;
  </code></pre>
  
  <p>Intellij highlights apache in red and says "cannot resolve symbol 'apache'"
  I also get an error when my code runs:</p>
  
  <pre><code>Error:(3, 32) java: package org.apache.commons.lang3 does not exist
  Error:(27, 28) java: cannot find symbol
    symbol:   variable ArrayUtils
    location: class com.company.Deck
  </code></pre>
  
  <p>How can I get it to recognize ArrayUtils?</p>
  
  <p>Sorry if this is a very basic question.</p>