mod_cluster/undertow/src/main/java/org/wildfly/mod_cluster/undertow/UndertowEngine.java
@Override
    public String getSessionCookieName() {
        SessionCookieConfig override = server.getServletContainer().getSessionCookieConfig();
        if (override == null || override.getName() == null) {
            return io.undertow.server.session.SessionCookieConfig.DEFAULT_SESSION_ID;
        }
        return override.getName();
    }
@Override
    public String getSessionCookieName() {
        SessionCookieConfig override = server.getServletContainer().getSessionCookieConfig();
        if (override == null || override.getName() == null) {
            return io.undertow.server.session.SessionCookieConfig.DEFAULT_SESSION_ID;
        }
        return override.getName();
    }
{@inheritDoc}

@return overridden session cookie name if defined, otherwise {@link io.undertow.server.session.SessionCookieConfig#DEFAULT_SESSION_ID}