Change effective on 17 March 2020
Heroku’s support for Java, Scala, Clojure, and Gradle now includes support for OpenJDK version 14. To use this version of the JDK, create a
system.properties file in your application with the following contents:
After your next deployment, Heroku will install and run your app with OpenJDK 14. For more information, see the article on Heroku Support for Java in the Dev Center. For more information on JDK 14, see the official OpenJDK documentation.