Change effective on 04 March 2015
Heroku’s support for Java 8 has upgraded the default runtime to OpenJDK 8u40. This is now the default JDK for all Java, Scala, Clojure, Groovy and JRuby applications when a
system.properties file is not present. It can also be specified explicitly with the following setting in a
This change will only take effect after your application’s next deployment.