Develop the Business Service Tier

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

	@Autowired
	private WorkerService workerService;
	
	@Autowired
	private WorkerWorkerService workerWorkerService;
	
	@Test
	public void testFindAll() {
		Assert.assertEquals(0L, workerWorkerService.findAll().size());
	}
}

@Service
@Transactional
public class WorkerWorkerServiceImpl implements WorkerWorkerService {

	@Autowired
	private WorkerDao workerDao;
	
	@Autowired
	private WorkerMapper workerMapper;
	
	@Autowired
	private WorkerWorkerDao workerWorkerDao;
	
	@Override
	public List<WorkerWorkerDto> findAll() {
		List<WorkerWorkerDto> workerWorkerDtos = new ArrayList<WorkerWorkerDto>();
		List<WorkerWorker> workerList = workerWorkerDao.getAll();
		for(WorkerWorker workerWorker : workerList) {	
			WorkerWorkerDto workerWorkerDto = new WorkerWorkerDto();	
			workerWorkerDto.setWorkerId1(workerMapper.mapEntityToDto(workerWorker.getWorker1()));
			workerWorkerDto.setWorkerId2(workerMapper.mapEntityToDto(workerWorker.getWorker2()));
			workerWorkerDto.setRelationshipType(workerWorker.getRelationshipType());
			workerWorkerDtos.add(workerWorkerDto);
		}
		return workerWorkerDtos;
	}
}