 <p>When you create a new App Engine project, all the required libraries are automatically added to the <a href="http://www.jetbrains.com/idea/webhelp/configuring-module-dependencies-and-libraries.html" rel="nofollow noreferrer">Module Dependencies</a>:</p> <p><img src="https://i.stack.imgur.com/LcjVO.png" alt="libraries"></p> <p>If you need more libraries, you should add them to the <a href="http://www.jetbrains.com/idea/webhelp/configuring-module-dependencies-and-libraries.html" rel="nofollow noreferrer">Dependencies</a> manually and then <a href="http://www.jetbrains.com/idea/webhelp/configuring-artifacts.html" rel="nofollow noreferrer">configure the Artifact</a> to include the libs:</p> <p><img src="https://i.stack.imgur.com/OTWxR.png" alt="artifact"></p> <p>If you are using API from <code>lib/shared</code> in your code, you need to add these jars to the dependencies as well, but with the <strong>Provided</strong> scope (and don't add it to the Artifact).</p>