Shibboleth UsernamePassword login handler

We recently switched our IdP installation from using RemoteUser login handler to the UsernamePassword handler for authentication. The UsernamePassword handler uses jaas for authentication. We're attempting to customize the default login.jsp page used by the Shibboleth IdP to our own page, this is done by recompiling the IdP with a web.xml file pointing to the new login page

     UsernamePasswordAuthHandler
     edu.internet2.middleware.shibboleth.idp.authn.provider.UsernamePasswordLoginServlet
     
        loginPage
        specialPages/login.jsp