title: Can't compile a module in java 9 using cmd
body: <p>Ok, so I'm trying to learn java 9 trough a book I bought, but when I try to compile a module trough the cmd, I get this error message. <a href="https://i.stack.imgur.com/6k0lI.png" rel="nofollow noreferrer">image of the cmd compile error</a></p>
  <p>I have been trying to understand what is happening for the last 2 days.</p>