metadatatxn.java

   public void transferWithMetadata() throws ApiException, AddressExcepion, CborSerializationException {
        BackendService backendService =
                BackendFactory.getBlockfrostBackendService(Constants.BLOCKFROST_TESTNET_URL, Constant.BF_PROJECT_KEY);
        FeeCalculationService feeCalculationService = backendService.getFeeCalculationService();
        TransactionHelperService transactionHelperService = backendService.getTransactionHelperService();
        BlockService blockService = backendService.getBlockService();

        String senderMnemonic = "kit color frog trick speak employ suit sort bomb goddess jewel primary spoil fade person useless measure manage warfare reduce few scrub beyond era";
        Account sender = new Account(Networks.testnet(), senderMnemonic);

        String receiver = "addr_test1qqwpl7h3g84mhr36wpetk904p7fchx2vst0z696lxk8ujsjyruqwmlsm344gfux3nsj6njyzj3ppvrqtt36cp9xyydzqzumz82";

        CBORMetadataMap productDetailsMap
                = new CBORMetadataMap()
                .put("code", "PROD-800")
                .put("slno", "SL20000039484");

        CBORMetadataList tagList
                = new CBORMetadataList()
                .add("laptop")
                .add("computer");

        Metadata metadata = new CBORMetadata()
                .put(new BigInteger("670001"), productDetailsMap)
                .put(new BigInteger("670002"), tagList);

        PaymentTransaction paymentTransaction =
                PaymentTransaction.builder()
                        .sender(sender)
                        .receiver(receiver)
                        .amount(BigInteger.valueOf(20000000))
                        .unit(LOVELACE)
                        .build();

        long ttl = blockService.getLastestBlock().getValue().getSlot() + 1000;
        TransactionDetailsParams detailsParams =
                TransactionDetailsParams.builder()
                        .ttl(ttl)
                        .build();

        BigInteger fee
                = feeCalculationService.calculateFee(paymentTransaction, detailsParams, metadata);
        paymentTransaction.setFee(fee);

        Result<String> result
                = transactionHelperService.transfer(paymentTransaction, detailsParams, metadata);

        if(result.isSuccessful())
            System.out.println("Transaction Id: " + result.getValue());
        else
            System.out.println("Transaction failed: " + result);

    }