I wanted to use this for some program I hadn’t control for running that Java app so ended with this _JAVA_OPTIONS=-Djava.net.preferIPv4Stack=true
environment variable. (read about _JAVA_OPTIONS here)
If you are using Windows, just run this command on Windows cmd:
setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true
Thanks to Jason Nichols for reminding this JVM argument 🙂