How to solve insufficient funds for gas price value error

Question

I am using web3j for blockchain and I have the following code:

// create new account 

Admin admin = Admin.build(new HttpService());

NewAccountIdentifier newAccount = admin.personalNewAccount("PASSWORD").send();

// get current created account

Web3j web3 = Web3.build(new HttpService());

EthAccounts accounts = web3.ethAccounts().send();

String lastAccount = Iterables.getLast(accounts.getAccounts());

// get creadentials for the first account having some ether

String firstAccount = web3.ethAccounts().send().getAccounts().get(0);

Credentials credentials = Credentials.create(firstAccount);

// get current balance for first account

EthGetBalance balance = admin.ethGetBalance(firstAccount, DefaultBlockParameterName.LATEST).send();

BigDecimal balanceVaue = Convert.fromWei(balance.getBalance().toString(), Convert.Unit.ETHER);

// create transaction to give the new created account some ether from the first one

// log some stuff

System.out.println("Account: " + firstAccount);

System.out.println("Account balance: " + balanceVaue);

System.out.println("Gas Price admin.ethGasPrice() in Ether: " + Convert.fromWei(gasPrice.toString(), Convert.Unit.ETHER));

System.out.println("Transfer Gas Limit in Ether: " + Convert.fromWei(Transfer.GAS_LIMIT.toString(), Convert.Unit.ETHER));

System.out.println("Transfer Gas Price in Ether: " + Convert.fromWei(Transfer.GAS_PRICE.toString(), Convert.Unit.ETHER));

TransactionReceipt transactionReceipt = Transfer.sendFunds(web3, credentials, lastAccount, BigDecimal.valueOf(10.0), Convert.Unit.ETHER).send();

String transactionHash = transactionReceipt.getTransactionHash();

Genesis block is as follows:

{

  "config": {

      "chainId": 9999,

      "homesteadBlock": 0,

      "eip155Block": 0,

      "eip158Block": 0,

      "byzantiumBlock": 0

   },

   "difficulty": "400",

   "gasLimit": "2100000",

   "alloc": {

      "0x9b6301bf2cfe11066dbd641f91a2b82e0783130e": { 

          "balance": "100000000000000000000000" 

      }

   }

}

How to solve this?

Answer 1

Change the following line

Credentials credentials = Credentials.create(firstAccount);

To the following line

Credentials credentials = Credentials.create("<PRIVATE_KEY_HERE>");

The error was because you were passing a wrong object. You had to pass the private key but you were passing the address. You should have no issues after making the above mentioned changes.