Use Omnifaces in Pac4j during using AuthorizationGenerator

Question

I´m trying to load after successful authentication from Keycloak (AUTH provider) some information and store in my @SessionScoped Bean and set it in the Session Attribute from Omnifaces.

In shiro.ini I defined this line:

roleAdminAuthGenerator = de.dpunkt.myaktion.util.Pac4jRoleAdminAuthGenerator
oidcClient.authorizationGenerator = $roleAdminAuthGenerator

This is my Pac4jRoleAdminAuthGenerator class:

import org.apache.commons.lang.exception.ExceptionUtils;
import org.omnifaces.util.Beans;
import org.pac4j.core.authorization.generator.AuthorizationGenerator;
import org.pac4j.core.context.WebContext;
import org.pac4j.core.context.session.SessionStore;
import org.pac4j.core.profile.UserProfile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import de.dpunkt.myaktion.user.controller.login.LoginBean;
import java.util.Optional;

public class Pac4jRoleAdminAuthGenerator implements AuthorizationGenerator {

    private final Logger LOGGER = LoggerFactory.getLogger(Pac4jRoleAdminAuthGenerator.class);

    public Pac4jRoleAdminAuthGenerator() {
    }

    @Override
    public Optional<UserProfile> generate(final WebContext context, final SessionStore sessionStore,
            final UserProfile profile) {

        try {

            final LoginBean loginBean = Beans.getReference(LoginBean.class);

            String username = profile.getUsername();

            loginBean.submitPac4j(username);

        }

        catch (Exception e) {
            LOGGER.error(ExceptionUtils.getFullStackTrace(e));
        }

        return Optional.of(profile);
    }

}

Using CDI is working via:

Beans.getReference(LoginBean.class)

In my LoginBean I got always a NPE for:

public void submitPac4j(String username)  {
    Faces.setSessionAttribute("myuser", new Object());
}

Because the Faces Context is NULL. -> In Omnifaces class "FacesLocal" this "context" is NULL

How can I fix this?