title: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 90 seconds of launch
body: <p>I am trying to deploy my Spring Boot Application to Heroku but I keep getting:</p>
  
  <pre><code>2018-05-06T14:41:35.181889+00:00 heroku[web.1]: Error R10 (Boot timeout) -&gt; Web process failed to bind to $PORT within 90 seconds of launch
  2018-05-06T14:41:35.182093+00:00 heroku[web.1]: Stopping process with SIGKILL
  2018-05-06T14:41:35.482221+00:00 heroku[web.1]: Process exited with status 137
  2018-05-06T14:41:35.496155+00:00 heroku[web.1]: State changed from starting to crashed
  </code></pre>
  
  <p>I've seen some answers which tell me so place </p>
  
  <pre><code>server.port=${PORT:8080}
  </code></pre>
  
  <p>in my application property but it is still not working.</p>
  
  <p>I don't see anything else what I can do and there's no further output that could hint me to the root of the problem.</p>
  
  <p>Any ideas?</p>