If you hit the api for getting the server details in Folsom, you would notice the entity "addresses".
The entity has a child element as list of network name. It seems impossible to unmarshall the JSON response to Java object as the response does not seem to follow a schema because the network name will depend on the implementation. Is there a workaround or am I getting something wrong?
This sounds like https://bugs.launchpad.net/nova/+bug/1084560 -- I'd go there and comment if you want to help get the bug fixed.