/deployment=app.war/subsystem=undertow:invalidate-session(session-id=id)

    public void invalidate(HttpServerExchange exchange) {
        // Do nothing
    }

            Session session = sessionManager.getSession(sessionId);

    public io.undertow.server.session.Session getSession(String sessionId) {
        // If requested id contains invalid characters, then session cannot exist and would otherwise cause session lookup to fail
        if (!IDENTIFIER_SERIALIZER.validate(sessionId)) {
            return null;
        }
        try (Batch batch = this.manager.getBatcher().createBatch()) {
            try {
                ImmutableSession session = this.manager.viewSession(sessionId);
                return (session != null) ? new DistributableImmutableSession(this, session) : null;