CODEWITHSUNDEEP
javamockito
javax
javax

Reputation: 25

Java Mockito object is mocked but throws NullPointerException

I'm trying to mock my service class but I can't mock my service. The service class:

@Service
class SomeService {
  private final Mapper mapper;
  private final Client sourceClient;
  private final Client destinationClient;

  public SomeService(Configuration configuration, Mapper mapper) {
   this.mapper = mapper;
   this.sourceClient = configuration.getSourceClient();
   this.destinationClient = configuration.getDestinationClient();
  }
  private Object fetch() {
   sourceClient.getData();
  }

 public List<MyClass> doLogic() {
  // do some logic here...
  Object dataFromClient = fetch()
 }
}

@ExtendWith(MockitoExtension.class)
class SomeServiceTest {
 @InjectMocks
 private SomeService someService;
 @Mock
 private Client sourceClient;
 @Mock Client destinationClient;
 @Mock Configuration configuration;
 @Mock Mapper mapper;

 @Test
 void test() {
  // given
   when(sourceClient.getData().getItems()).thenReturn(preparedData());
  // when
  someService.doLogic();
 }

 private Object prepareData() {
  return new Object();
 }

I'm getting NullPointerException as it is now. I've noticed that the source of the problem is to call method getItems() in 'when(sourceClient.getData().getItems())'. When there is just getData() there is no NullPointerException but I would like to use getData().getItems(). Is there any way to mock or spy on that methods ? I would like to avoid mocking just getData() because of the object required to mock it.

Upvotes: 0

Views: 1185

Answers (2)

DwB
DwB

Reputation: 38290

You are using a mock of Configuration, but you are not stubbing either the configuration.getSourceClient() method or the configuration.getDestinationClient() method.

Because of this, sourceClient is null in the SomeService.fetch() method.

Upvotes: 1

Johannes
Johannes

Reputation: 146

@ExtendWith(MockitoExtension.class) indicates you are using junit5. so make sure you also use the @Test annotation from junit5 and not junit4

Upvotes: 0

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