Pass specific address in Web3J send method

Question

How to pass specific address in send method in Web3J?

For example, using web3 javascript library, we can pass from address like below.

contract.someMethod().send({ from: this.props.accounts[0] })

But in the Java wrapper, there are no parameters defined for send() method.

Is there a way to pass specific address in web3j?

Answer 1

If you want to send an unsigned transaction and let the client pick up the account from to use to sign the transaction. You can do the following:

Ether transaction

Transaction transaction = Transaction.createEtherTransaction(from, nonce, gasPrice, gasLimit, to, value);
web3.ethSendTransaction(transaction);

Smart contract transaction

Function function = new Function<>(
        "functionName",  // function we're calling
        Arrays.asList(new Type(value), ...),  // Parameters to pass as Solidity Types
        Arrays.asList(new TypeReference<Type>() {}, ...));

String encodedFunction = FunctionEncoder.encode(function)
Transaction transaction = Transaction.createContractTransaction(from, nonce, gasPrice, encodedFunction);
web3.ethSendTransaction(transaction);

---

Transaction Receipt:

String txHash = web3.ethSendTransaction(transaction).send().getTransactionHash();

EthGetTransactionReceipt transactionReceipt =
         web3j.ethGetTransactionReceipt(txHash).send();

if (transactionReceipt.getTransactionReceipt.isPresent()) {
    String contractAddress = transactionReceipt.get().getContractAddress();
} else {
    // try again until it's mined
}

Answer 2

Did you try this ?

contract.someMethod(parameter, {from: address, gas: 3000000},
function(err, res){

    if(!err){
        console.log("address sent ");    
    }
});