Version I am inquiring about is 4.2.3GA
This turned out to be a permission problem. The problem I have now is defining the permission so that a SYSTEM runing process can access the directory.
If you are running JBoss AS as SYSTEM, can I assume that you are running JBoss AS as a service? Why not define a new user specifically for use by the JBoss AS service and define your access permissions based on that user account?
Also, I have no idea how you "mounted" that directory - some details (what config file you modified) might help.