Creating wallets with Web3j

Question

I generate a code to create wallets for a private chain made with ethereum.

String password = unlockAccountParameter.getPass();
        ECKeyPair keyPair = Keys.createEcKeyPair();
        WalletFile wallet = Wallet.createStandard(password, keyPair);

        System.out.println("Private key: " + keyPair.getPrivateKey().toString(16));
        System.out.println("Account: " + wallet.getAddress());

        String fileName = WalletUtils.generateNewWalletFile(unlockAccountParameter.getPass(), new File("C:\\Users\\emendez\\Wallet"), true);

        System.out.println("File name: " + fileName);

Thats return me this output:

Priate key: 67f7a218d5d595dff19cafca9384b5a6e0693bc085d7c16468b8a8a44e20135a Account: bf29892787a79bb66188f9c44ca9ffd9ccff37aa

File name: UTC--2018-11-15T12-26-51.672000000Z--252209a58e16be3c43776e38ff4bfaeb70660cfb.json

The JSON file is in the path that write in code (in the real machine). But when I go to the geth console for list the account that are created in the node (virtualmachine) the account that I just created does not appear.

So i think that i cant make transaction between them.

Any help??

Answer 1

The problem might be related to the location where you are storing your wallet.

To be automatically detected, the wallet file needs to be stored in a folder called keystore inside the folder where geth is installed. These are the most common paths:

– Mac: ~/Library/Ethereum

– Linux: ~/.ethereum

– Windows: %USERPROFILE%\AppData\Roaming\Ethereum

If you can't access that folder, you can import your account by using this command:

geth account import --datadir /fileWithOnlyPrivateKey --password /fileWithPasswordStringToEncryptThatKey ./key.prv

And your final solution would be to generate the transaction in your code, and send the transaction already signed to the node (This would be the safest approach if you can keep your private key safe), look into web3 to learn how to do that