Run a Maven Project using IntelliJ IDEA : <p>I'm new to IntelliJ IDEA and I would like to run a simple Maven Quickstart project using it.</p>

<p>I followed all the instructions, the project was sucessfully built. But when I try to compile and run it , the <code>Run</code> button is not activated.</p>

<p>It looks like IntelliJ IDEA couldn't figure out where the main class is.</p>

<p>This is a picture of the project's hierarchy.</p>

<p><a href="https://i.stack.imgur.com/64AOZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/64AOZ.png" alt="enter image description here"></a></p>

<p>What is the problem ? And how can I fix it ?</p>

<p>Thanks !</p>
