Config variable added to some JVM apps

Change effective on 05 April 2013

We recently became aware of a bug which affects most of the JDK versions being used by Heroku customers and we released a patched JDK. To mitigate the effect of the bug we’ve added the following configuration variable to apps that are potentially using an un-patched JDK:

JAVA_TOOL_OPTIONS='-Djava.net.preferIPv4Stack=true'

You can read more about configuration variables on Dev Center.