title: Sonar analysis abort because 'No files nor directories matching 'target/classes'
body: <p>I'm performing an analysis with Sonar but I get the following error:</p>
  
  <pre><code>Error during SonarQube Scanner execution
  java.lang.IllegalStateException: No files nor directories matching 'target/classes'
  </code></pre>
  
  <p>In my project I've the target directory but no classes directory or files, what should be in there for the analysis to work?</p>