code: private void setIssuer(Object val) throws CertificateException {
          if (!(val instanceof X500Name)) {
              throw new CertificateException(
                               "Issuer class type invalid.");
          }
          issuer = (X500Name)val;
      }
docs: Set the issuer name of the certificate.
  
  @params val the Object class value for the issuer
  @exception CertificateException on invalid data.