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Account Update

Import necessary classes from the Web3j and kaia libraries(web3j-ext)

Create a Web3j instance with the specified BAOBAB_URL

Also, you can change the default provider. For example, using the alchemy provider.

Creating new credentials using PUBLIC_KEY_privkey and PUBLIC_KEY_address

Gas price and gas limit settings

Get chain ID from the network

Get the nonce for the sender's address

Generate a new account key for account update

Create a raw transaction for account update

Sign the transaction

Send the signed transaction to kaia network

Get the transaction receipt and using the transaction hash

Shutting down the Web3j instance

Decoding the raw transaction to get the transaction type

AccountUpdateExample.java

package org.web3j.example.transactions;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

import java.io.IOException;

import java.math.BigInteger;

import org.web3j.crypto.KlayCredentials;

import org.web3j.crypto.KlayRawTransaction;

import org.web3j.crypto.KlayTransactionEncoder;

import org.web3j.crypto.transaction.account.AccountKeyPublic;

import org.web3j.crypto.transaction.type.TxType;

import org.web3j.crypto.transaction.type.TxTypeAccountUpdate;

import org.web3j.crypto.transaction.type.TxType.Type;

import org.web3j.protocol.core.DefaultBlockParameterName;

import org.web3j.protocol.core.methods.response.EthChainId;

import org.web3j.protocol.core.methods.response.EthSendTransaction;

import org.web3j.protocol.kaia.Web3j;

import org.web3j.protocol.http.HttpService;

import org.web3j.utils.Numeric;

import org.web3j.protocol.kaia.core.method.response.TransactionReceipt;

/**

*

*/

public class AccountUpdateExample implements keySample {

/**

*

*/

public static void run(KlayCredentials credentials) throws Exception {

Web3j web3j = Web3j.build(new HttpService(keySample.BAOBAB_URL));

KlayCredentials new_credentials = KlayCredentials.create(PUBLIC_KEY_privkey, PUBLIC_KEY_address);

BigInteger GAS_PRICE = BigInteger.valueOf(50000000000L);

BigInteger GAS_LIMIT = BigInteger.valueOf(6721950);

String from = credentials.getAddress();

EthChainId EthchainId = web3j.ethChainId().send();

long chainId = EthchainId.getChainId().longValue();

BigInteger nonce = web3j.ethGetTransactionCount(from, DefaultBlockParameterName.LATEST).send()

.getTransactionCount();

BigInteger newPubkey = new_credentials.getEcKeyPair().getPublicKey();

AccountKeyPublic accountkey = AccountKeyPublic.create(newPubkey);

TxType.Type type = Type.ACCOUNT_UPDATE;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

from,

accountkey);

byte[] signedMessage = KlayTransactionEncoder.signMessage(raw, chainId, credentials);

String hexValue = Numeric.toHexString(signedMessage);

EthSendTransaction transactionResponse = web3j.ethSendRawTransaction(hexValue).send();

System.out.println("TxHash : \n " + transactionResponse.getResult());

String txHash = transactionResponse.getResult();

int DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH = 40;

int DEFAULT_BLOCK_TIME = 1 * 1000;

long DEFAULT_POLLING_FREQUENCY = DEFAULT_BLOCK_TIME;

TransactionReceiptProcessor transactionReceiptProcessor = new PollingTransactionReceiptProcessor(web3j,

DEFAULT_POLLING_FREQUENCY, DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH);

org.web3j.protocol.core.methods.response.TransactionReceipt ethReceipt = transactionReceiptProcessor

.waitForTransactionReceipt(txHash);

System.out.println("Receipt from eth_getTransactionReceipt : \n" + ethReceipt);

TransactionReceipt receipt = web3j.klayGetTransactionReceipt(txHash).send().getResult();

System.out.println("Receipt from klay_getTransactionReceipt : \n" + receipt);

web3j.shutdown();

TxTypeAccountUpdate rawTransaction = TxTypeAccountUpdate.decodeFromRawTransaction(signedMessage);

System.out.println("TxType : " + rawTransaction.getKlayType());

}

}

output

❯ java AccountUpdateExample.java

TxHash :

0x3518b0ba53160e39741d151fef3813230ea8793e12499bc21a08bd8b75adab1c

receipt :

class TransactionReceipt {

blockHash: 0xbc9def91ea0b147a9a587ec767a9442085699cfc19508fa1fe1de917d6558154

blockNumber: 0x8dea85e

codeFormat: null

contractAddress: null

feePayer: null

feePayerSignatures: []

feeRatio: null

from: 0xa2a8854b1802d8cd5de631e690817c253d6a9153

gas: 0x66919e

effectiveGasPrice: 0x5d21dba00

gasPrice: 0xba43b7400

gasUsed: 0xa028

humanReadable: null

key: 0x02a103dc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cd

input: null

logs: []

logsBloom: 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

nonce: 0x3bc

senderTxHash: 0x3518b0ba53160e39741d151fef3813230ea8793e12499bc21a08bd8b75adab1c

signature: []

status: 0x1

txError: null

to: null

transactionHash: 0x3518b0ba53160e39741d151fef3813230ea8793e12499bc21a08bd8b75adab1c

transactionIndex: 0x0

type: TxTypeAccountUpdate

typeInt: 32

value: null

}

TxType : ACCOUNT_UPDATE