There are some new features in JBoss Negotiation 2.1.0 (especially fallback to form aka SECURITY-141 ), which will be nice to have in EPP 5.2. EPP 5 is based on JBoss 5 (JBoss web 2.x) and unfortunately JBoss Negotiation has been upgraded to be API compatible with JBoss 6 (JBoss web 3).

Main problem problem especially signature of method NegotiationAuthenticator.authenticate(final Request request, final HttpServletResponse response, final LoginConfig config) where in JBoss 5 signature of method was authenticate(final Request request, final Response response, final LoginConfig config)

This means that using NegotiationAuthenticator from Negotiation 2.1.0 is not working in JBoss 5 due to this compatibility problem. Unfortunately approaches like inheritance of NegotiationAuthenticator are not working because there is also change in signature of method AuthenticatorBase.register .

It will be nice to have backwards compatibility with JBoss 5, which is possible by adding methods with old signature into class NegotiationAuthenticator, and with this approach it should work in both JBoss 5 and JBoss 6.