title: Running a java subprocess from a python app in Heroku
body: <p>I am new to Heroku. The backend logic of my flask web app is actually running a Java subprocess (<code>subprocess.call( ...)</code> ) to get some helper data. (I know it's a bad thing to do)<br>
  On deployment, Heroku works as expected and installs Python runtime and frameworks from requirements.txt but not JDK.</p>
  
  <p>Any way I can configure Java in the same and make this work ??</p>