Soy relativamente nuevo en elMarco de primavera y seguridad de primavera.

He utilizado un esquema de autenticación personalizado, HTML:

<form action="j_spring_security_check">
    <input type="text" name="j_username" value="abc"/>
    <input type="text" name="j_password" value="abc"/>
    <input type="text" name="myCustom1" value="pqr"/> <!-- maybe type="hidden" -->
    <input type="text" name="myCustom2" value="pqr"/> <!-- maybe type="hidden" -->
</form>

y el código correspondiente:

public class CustomAuthenticationProvider extends AbstractUserDetailsAuthenticationProvider
{
    @Override protected void additionalAuthenticationChecks(UserDetails userDetails, UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken)
    throws AuthenticationException
    {
        System.out.println("Method invoked : additionalAuthenticationChecks isAuthenticated ? :"+usernamePasswordAuthenticationToken.isAuthenticated());
    }

    @Override protected UserDetails retrieveUser(String username,UsernamePasswordAuthenticationToken authentication)
    throws AuthenticationException
    {
        System.out.println("Method invoked : retrieveUser");
        //I have Username,password:
        //HOW CAN I ACCESS "myCustom1", "myCustom2" here ?
    }
}