form-login with custom fields (JSJAS 8.2)

Question

Hi all,

I'm developing a custom LoginModule and corresponding Realm for using in SJSAS 8.2. Basically four fields will be necessary in my authentication strategy.

Is there a way to use custom fields in my login form (additionally to j_username and j_password) in order to take advantage of declarative approach?

I don't want to concatenate fields in j_password or something like it. Besides, of course, I´d like do take advantage of all JAAS infra-structure for authorization and not using custom filters to do this.

Maybe a custom Authenticator? how?

Thanks in advance,

Andre