Have a look for PrefixDeploymentSorter
I did see the "PrefixDeploymentSorter" solution, however I had hoped there was a better solution to it. This seems a rather temporary solution to something fundamental.
I probably won't have time to implement it myself, but a deployment sorter that looks in the ear for ejb-ref links would be ideal and not tht hard to make. Even a DeploymentSorter that takes a fixed xml-file to base it's ordering on would be better than this prefix-sorter.
Make a new directory under your deploy directory named "deploy.last" and put the VolatilityManager EAR in there.
Or, I think as of 3.2.3 you can specify a tag in your application.xml that will let JBoss know to deploy one before the other and redeploy both if the one changes. I ran into a bug with this though that prevented hot redeploy from working. Its supposed to be fixed in 3.2.4 that's rumored to be out soon.