I am quite new to Bitcoin. I am trying to use Bitcoinj with regtest mode. I have created the following application:

public class TestBitcoinj {
    private final static BigInteger ONE = new BigInteger("12345");
    private final static BigInteger TWO = new BigInteger("67890");

    public static void main(String ... args) throws Exception {
        final ECKey from = new ECKey(ONE);
        final ECKey to = new ECKey(TWO);
        System.out.format("from: %s, to: %s\n", from.toAddress(RegTestParams.get()), to.toAddress(RegTestParams.get()));

        final WalletAppKit kit = new WalletAppKit(RegTestParams.get(), new File("/tmp/bitcoinj"), "mirko_btc") {
            protected void onSetupCompleted() {
                System.out.println("Key chain size: " + wallet().getKeychainSize());
                if (wallet().getKeys().isEmpty()) {
                    wallet().addKey(from);
                }
            }
        };

        kit.setAutoSave(true);
        kit.connectToLocalHost();
        System.out.println("State: " + kit.startAndWait());

        System.out.println("Address: " + kit.wallet().getKeys().get(0).toAddress(RegTestParams.get()));
        System.out.println("Private key: " + kit.wallet().getKeys().get(0).getPrivateKeyEncoded(RegTestParams.get()));
        System.out.println("Balance: " + kit.wallet().getWatchedBalance());
        System.out.println("Done");
        System.out.println("State: " + kit.stopAndWait());

    }
}

I have started bitcoind with the following:

bitcoind -regtest

I have generated some blocks just to have some money:

bitcoin-cli -regtest setgenerate true 101

Then I have run my program just to have the private key, which is:

Chiave privata: cNQM8FUZ9tJeNKNNJPiwHZpWkREqzzk5JhioYJWZaszHa5vgsLct

Now I import that private key in bitcoind using the following:

bitcoin-cli -regtest importprivkey cNQM8FUZ9tJeNKNNJPiwHZpWkREqzzk5JhioYJWZaszHa5vgsLct mirko4

Finally, I have noticed that my program dumps the following:

Indirizzo: mrtwCcpmvRYU5wBDaUP8LiaW85nGEkbauM

whereas if I run the following:

bitcoin-cli -regtest getaccountaddress mirko4

I get the following address:

mrXizN9m9cyKgvBKqCVzTvMAWJoVgnBBev

That address is far different from the one I have dumped using Bitcoinj. However, the private key should be the same.

Probably I am missing something, but I can not figure out what.

Thank you very much for your support.