Java 7 upgraded to OpenJDK 7u75
Change effective on 02 February 2015
Heroku’s support for Java 7 has been upgraded to OpenJDK 7u75. This change affects all Java, Scala, Clojure, Groovy and JRuby applications with the following setting in their
This change will only take effect after your application’s next deployment. Heroku’s Java 8 support remains at version 8u20 and is still the default version when a
system.properties file is not present.