@Component Always Null In Spring Boot

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Problem Description:

I have two classes which are annotated as @Component

@Component
public class ClientMapper {
  public Client convert(ClientEntity clientEntity) {
    Client client = new Client();
    BeanUtils.copyProperties(clientEntity, client);
    return client;
  }

  public ClientEntity convert(Client client) {
    ClientEntity clientEntity = new ClientEntity();
    BeanUtils.copyProperties(client, clientEntity);
    return clientEntity;
  }
}

@Component
public class OrderMapper {
  public Order convert(OrderEntity orderEntity) {
    Order order = new Order();
    BeanUtils.copyProperties(orderEntity, order);
    return order;
  }

  public OrderEntity convert(Order order) {
    OrderEntity orderEntity = new OrderEntity();
    BeanUtils.copyProperties(order, orderEntity);
    return orderEntity;
  }
}

I injected them into different services

@Service
@AllArgsConstructor
public class ClientServiceImpl implements ClientService {

  private final ClientMapper clientMapper;
  private final ClientRepository clientRepository;

@Service
@AllArgsConstructor
public class OrderServiceImpl implements OrderService {

  private final OrderMapper orderMapper;
  private final OrderRepository orderRepository;
  private final OrderNumberRepository orderNumberRepository;

But all time my mappers is null. I don’t create new Object of them using new command. Also with my repository interfaces everything is fine, so my way to inject my comments(@AllArgsContrustor) works correct.

Little note, I have tests classes where I used @InjectMocks on my services classes. Can it be that my error occupied because of this annotation?

@ExtendWith(MockitoExtension.class)
public class OrderServiceTest {
  @Mock
  private OrderRepository orderRepository;
  @InjectMocks
  private OrderServiceImpl orderService;

Solution – 1

You are using MockitoExtension, spring won’t create component of OrderMapper.
If you need actual implementation. Use @Spy annotation of MockitoExtension.

@ExtendWith(MockitoExtension.class)
public class OrderServiceTest {
  @Mock
  private OrderRepository orderRepository;
  @Spy
  private OrderMapper orderMapper = new OrderMapper(); // Note: new OrderMapper() is optional as you have No Argument Constructor
  @InjectMocks
  private OrderServiceImpl orderService;

Or as a practice @Mock is always best way to go instead of @Spy incase of Unit test.

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