code: public static X509Name getIssuerFields(X509Certificate cert) {
          try {
              return new X509Name((ASN1Sequence)getIssuer(cert.getTBSCertificate()));
          }
          catch (Exception e) {
              throw new ExceptionConverter(e);
          }
      }
docs: Get the issuer fields from an X509 Certificate
  @param cert an X509Certificate
  @return an X509Name