I think you don't have enough factories. bank.move(new Amount(100), AccountChannelFactory.create(AccountChannelFactory.CHECKING_CHANNEL, checkingAccount), Acco

I think you don't have enough factories. bank.move(new Amount(100), AccountChannelFactory.create(AccountChannelFactory.CHECKING_CHANNEL, checkingAccount), AccountChannelFactory.create(AccountChannelFactory.SAVINGS_CHANNEL, savingsAccount));