SslSettings(final Builder builder) {
        enabled = builder.enabled;
        invalidHostNameAllowed = builder.invalidHostNameAllowed;
        if (enabled && !invalidHostNameAllowed) {
            if (System.getProperty("java.version").startsWith("1.6.")) {
                throw new MongoInternalException("By default, SSL connections are only supported on Java 7 or later.  If the application "
                                                 + "must run on Java 6, you must set the SslSettings.invalidHostNameAllowed property to "
                                                 + "false");
            }
        }
    }