We have identified a potential issue with JClouds and OpenStack Liberty. There are some API changes with Liberty that JClouds does not handle correctly. See https://issues.apache.org/jira/browse/JCLOUDS-1104 for more information.
If you are using the affected JClouds versions, please take note that it might stop working when NeCTAR RC upgrades to Liberty. A workaround might be to upgrade to the latest 2.0.0 snapshot version of JClouds, however this is untested.