Java: URL.openStream() - use IPv4

Question

By default url.openStream(); uses IPv6. My schools server silently blocks IPv6. This causes url.openStream(); to hang for 3 minutes and 15 seconds. Is there a way that I can get url.openStream() to use IPv4 by default?

Answer 1

set java.net.preferIPV4Stack=true

As per : http://download.oracle.com/javase/1.4.2/docs/guide/net/properties.html