ClassCastException when combining InjectMocks with generified Mock field

[jsteenbeeke]

When calling MockitoAnnotations.openMocks(this); on a class that contains an @InjectMocks target, a ClassCastException occurs when the target has a field that is generified and provided by one of the mocks in said class.

public class OpenMocksTest
{
	@InjectMocks
	protected ConcreteJob job;

	@Mock
	JobInstance<ConcreteJob> instance;

	@BeforeEach
	public void initMocks()
	{
		openMocks(this);
	}

	@Test
	public void testMockExists()
	{
		assertNotNull(job);
	}
}

I've attached a Maven project which demonstrates this flaw. Downgrading the Mockito version to 5.1.1 fixes the issue.

mockito-5.2.0-bug.zip

[TimvdLippe]

Probably a regression introduced in #2923. @jfrantzius can you please take a look?

[jfrantzius]

Looking at it...

[jfrantzius]

That's an interesting somehow recursive construct that I'm surprised the compiler accepts, but then there surely shouldn't be a ClassCastException anyway ...

public class ConcreteJob extends AbstractJob<ConcreteJob>

(a class that uses itself as a type parameter for its superclass? 🤯 )

[jfrantzius]

@TimvdLippe WDYT?