Hi,

I'm getting this error when running the tests for xwiki-observation-remote:

Caused by: java.lang.RuntimeException: the type of the stack (IPv6) and the 
user supplied addresses (IPv4) don't match: localhost/127.0.0.1.
Use system props java.net.preferIPv4Stack or java.net.preferIPv6Addresses to 
pick the correct stack
        at 
org.jgroups.stack.Configurator.setupProtocolStack(Configurator.java:108)
        at 
org.jgroups.stack.Configurator.setupProtocolStack(Configurator.java:54)
        at org.jgroups.stack.ProtocolStack.setup(ProtocolStack.java:453)
        at org.jgroups.JChannel.init(JChannel.java:1702)

This thread explains the problem:
http://old.nabble.com/Protocol-stack-issue-on-dual-stack-(IPv4-and-v6)-machines-td27544685.html

This issue has been created to track the problem:
https://jira.jboss.org/browse/JGRP-1152

I've tested with jgroups 2.10.0.Beta2 and it works fine.

I've seen on http://jira.xwiki.org/jira/browse/XWIKI-4917 that jgroups 2.9 and 
above require JDK 6+.

What do we do?

Should we set the jgroups property to force ipv4 or ipv6?

Thanks
-Vincent
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