How can I disable IPv6 stack use for IPv4 IPs on JRE?

ipv6, java, jvm, jvm-arguments

Solution

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 :)

Problem

As you can see on below screenshots, eclipse and Android SDK Manager (and other Java programs) are trying to connect to a IPv4 Internet IP via IPv6 TCP/IP stack while Proxifier (a proxy manager program, nevermind) can not support that. How I can disable IPv6 in Java?

Original source