Develop the Business Service Tier

@RunWith( SpringJUnit4ClassRunner.class )
@ContextConfiguration( locations = { "classpath:context.xml" } )
@TransactionConfiguration( defaultRollback = true )
@Transactional
public class ClientAccountServiceImplTest {

	@Autowired
	private ClientService clientService;
	
	@Autowired
	private AccountService accountService;
	
	@Autowired
	private ClientAccountService clientAccountService;
	
	@Test
	public void testFindAll() {
		Assert.assertEquals(0L, clientAccountService.findAll().size());
	}
}

@Service
@Transactional
public class ClientAccountServiceImpl implements ClientAccountService {
	@Autowired
	private ClientDao clientDao;
	
	@Autowired
	private ClientMapper clientMapper;
	
	@Autowired
	private AccountDao accountDao;
	
	@Autowired
	private AccountMapper accountMapper;
	
	@Autowired
	private ClientAccountDao clientAccountDao;
	@Override
	public List<ClientAccountDto> findAll() {
		List<ClientAccountDto> clientAccountDtos = new ArrayList<ClientAccountDto>();
		List<Client> clientList = clientAccountDao.getAll();
		for(Client client : clientList) {			
			ClientDto clientDto = clientMapper.mapEntityToDto(client);			
			Set<Account> accounts = client.getAccounts();
			for(Account account : accounts) {
				ClientAccountDto clientAccountDto = new ClientAccountDto();
				clientAccountDto.setClientDto(clientDto);
				AccountDto accountDto = accountMapper.mapEntityToDto(account);
				clientAccountDto.setAccountDto(accountDto);
				clientAccountDtos.add(clientAccountDto);
			}			
		}
		return clientAccountDtos;
	}
}