Currently I am using JBoss seam authentication using

Authenticator component

<security:identity authenticate-method="#{authenticator.authenticate}"/>

and my authentciation method looks like

@Name("authenticator")

public class Authenticator{   

    @In   

    Identity identity;  

    @In

    EntityManager entityManager;

    public boolean authenticate() {

        boolean found = false;

        List<XYZ> userList = (List) entityManager.createQuery( "from XYZ").getResultList();

        for (int i = 0; i < userList.size(); i++) {

            XYZ user = (XYZ)userList.get(i);

            if(identity.getUsername().equalsIgnoreCase(user.getUsername())){               

                return true;

            }

        }

        if(!found){

            FacesMessages.instance().add("Invalid username");

            return false;            

        }

        return false;    

    }

now as per new requirement , from one web site when ever user clicks on seam application link , I need to pass user name and invoke above authentication method , so that I am able to login and load user roles as well..

Please provide valuable feed back.

Thanks in advance !!