web3j/web3j

i would use personal api if your node supports it

 private String sendTX(Credentials credentials, String contractAddress, String funData) {
        BigInteger nonce = getNonce(admin.getAddress());
        DefaultGasProvider gp = new DefaultGasProvider();

        RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gp.getGasPrice(), gp.getGasLimit(), contractAddress, funData);
        byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
        String hexValue = Numeric.toHexString(signedMessage);

        try {
            EthSendTransaction response = web3.ethSendRawTransaction(hexValue).send();
            String hash = response.getTransactionHash();
            return hash;
        } catch (Exception ex) {
            throw new ServiceException(ServiceExceptionEnum.CONTRACT_CALL_FAIL.getCode(), ex.getMessage());
        }
    }