Sample fails to run on Ubuntu with SocketException "bad argument for IP_MULTICAST_IF"

This is the exception:

Caused by: java.net.SocketException: bad argument for IP_MULTICAST_IF: address not bound to any interface
at java.net.PlainDatagramSocketImpl.socketSetOption(Native Method)
at java.net.PlainDatagramSocketImpl.setOption(PlainDatagramSocketImpl.java:299)
at java.net.MulticastSocket.setInterface(MulticastSocket.java:420)
at com.gemstone.org.jgroups.protocols.UDP.createSockets(UDP.java:669)
at com.gemstone.org.jgroups.protocols.UDP.start(UDP.java:535)

Gemfire needs a way to find the other caches in the network. Either multicast or a locator process can be used for that. Locator is the recommended approach so that would be the preferred solution.

A quick workaround is to use "-Djava.net.preferIPv4Stack=true".