I found this class in JBoss source.
I'm also using it in my auth.conf file

example2
{
org.jboss.security.auth.spi.DatabaseServerLoginModule required
dsJndiName="java:/DefaultDS"
principalsQuery="Select Password from Principals where PrincipalID =?"
rolesQuery="Select Role 'Roles', RoleGroup 'RoleGroups' from Roles where PrincipalID =?"
;
};

But i just can find in what package it's in ... ????