code: public void revoke(User revoker, String serial, String aki, String reason) throws RevocationException, InvalidArgumentException {
          revokeInternal(revoker, serial, aki, reason, false);
      }
docs: revoke one certificate
  
  @param revoker admin user who has revoker attribute configured in CA-server
  @param serial  serial number of the certificate to be revoked
  @param aki     aki of the certificate to be revoke
  @param reason  revoke reason, see RFC 5280
  @throws RevocationException
  @throws InvalidArgumentException