get modules

 String bankCode = "30006" ;
      String branchCode = "00001" ;
      Random r = new Random();
      int Low = 10;
      int High = 1000000;
      int AccountNumberInt = r.nextInt(High-Low) + Low;
      String AccountNumberStr = String.valueOf(AccountNumberInt);
      String AccountNumber = StringUtils.repeat("0", 11 - AccountNumberStr.length()) + AccountNumberStr;
      long a100000000000 =  (long) 100000000000.0;
      Long nationalCheckDigitInt = 97 - (((Long.valueOf(bankCode) % 97 * 100000 + Integer.valueOf(branchCode)) % 97 * a100000000000 + Integer.valueOf(AccountNumber)) % 97) * 100 % 97;
       String nationalCheckDigit = String.valueOf(nationalCheckDigitInt) ;
       Iban iban = new Iban.Builder().countryCode(CountryCode.FR).bankCode(bankCode).branchCode(branchCode).accountNumber(AccountNumber).nationalCheckDigit(nationalCheckDigit).buildRandom();