title: Is TLSv1.3 supported in OpenJDK 11 under Ubuntu?
body: <p>On Ubuntu 18.04</p>
  
  <pre><code>sudo apt install openjdk-11-source
  </code></pre>
  
  <p>results in a <code>ProtocolVersion.java</code> that does not know about TLSv1.3 .
  Is there any way to correct that (without restrictive licencing)?</p>