appfoundation user management

hello all,
i want to use appfoundation addon for user management needs in my vaadin app.
in my app all data are coming from a service via rmi (i don’t know database server, table, etc…)
as i understand, for example to authenticate a user i use AuthenticationUtil.authenticate(username,password) and in the background it communicates persistence layer and somehow looks that user is valid or not.
my question is, can i use my that rmi service to validate users?
if yes, how i can do it?
any ideas are acceptable for me.
thanks in advance.

Unfortunately no, the authentication module only provides the built-in mechanism which uses JPA based persistence, in other words, the authentication is done towards a database specified with the persistence module.

thanks Kim.