if (clientSerial != null) {
X509Certificate[] cert = (X509Certificate[]) req.getAttribute("javax.servlet.request.X509Certificate");
if (cert == null || cert[0] == null//
if (clientSerial != null) {
X509Certificate[] cert = (X509Certificate[]) req.getAttribute("javax.servlet.request.X509Certificate");
if (cert == null || cert[0] == null//