Mockito NullPointerException
35,086
You haven't mocked the behavior of getId
in externalDependencyObject
therefore it is returning null
and giving you the NPE when toString()
is called on that null
.
You need a when(externalDependencyObject.getId()).then...
Author by
Anuj
I am enthusiastic programmer Focus: J2EE Django/Python NoSQL
Updated on July 12, 2022Comments
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Anuj almost 2 years
I followed what @hoaz suggested. However, I am getting nullpointer exception
@RunWith(MockitoJUnitRunner.class) public class GeneralConfigServiceImplTest { @InjectMocks private GeneralConfigService generalConfigService; @Mock private SomeDao someDao; @Mock private ExternalDependencyClass externalDependencyObject @Test public void testAddGeneralConfigCallDAOSuccess() { when(someDao.findMe(any(String.Class))).thenReturn(new ArrayList<String>(Arrays.asList("1234"))); //println works here, I am able to get collection from my mocked DAO // Calling the actual service function generalConfigService.process(externalDependencyObject) } }
In my Code it's like this:
import com.xyz.ExternalDependencyClass; public class GeneralConfigService{ private SomeDao someDao; public void process(ExternalDependencyClass externalDependencyObject){ // function using Mockito Collection<String> result = someDao.findMe(externalDependencyObject.getId.toString()) } }
I also notice that DAO was null so I did this(Just to mention, I did the below step to try, I know the difference between springUnit and Mockito or xyz):
@Autowired private SomeDao someDao;
@John B solution solved my problem. However I would like to mention what did not work for me. This is my updated unit test@Test public void testAddGeneralConfigCallDAOSuccess() { /* This does not work externalDependencyObject.setId(new ExternalKey("pk_1")); // verify statement works and I thought that the class in test when call the getId // it will be able to get the ExternalKey object //verify(externalDependencyObject.setId(new ExternalKey("pk_1"))); */ // This works when(externalDependencyObject.getId()).thenReturn(new ExternalKey("pk_1")); when(someDao.findMe(any(String.Class))).thenReturn(new ArrayList<String>(Arrays.asList("1234"))); .... // Calling the actual service function generalConfigService.process(externalDependencyObject) }
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