Tristan,
Thanks for your stack traces recently. While you've found a workaround for yourself, this is still a bug in Infinispan and I've created a JIRA. I'll check in a fix soon.
https://issues.jboss.org/browse/ISPN-903
Cheers
Manik
--
Manik Surtani
manik@jboss.org
twitter.com/maniksurtani
Lead, Infinispan
http://www.infinispan.org