mockito - org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.addAnswersForStubbing 处的 java.lang.NullPointerException

Question

异常

java.lang.NullPointerException 
    at org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.addAnswersForStubbing(PowerMockitoStubberImpl.java:67)
    at org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.when(PowerMockitoStubberImpl.java:42)
    at org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.when(PowerMockitoStubberImpl.java:105)
    at us.ny.state.ij.safeact.ask.facade.AmmoSellerKeeperFacadeBeanTest.setUp(FacadeBeanTest.java:84)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at 

模拟代码

BusinessServiceFactory serviceFactory = BusinessServiceFactory.getInstance();
RegBusinessServiceImpl regCreateService = 
    serviceFactory.getRegBusinessService(adrEntityManager);

测试代码

@RunWith(PowerMockRunner.class)
@PrepareForTest({ BusinessServiceFactory.class})
public class FacadeBeanTest {

    @Before
    public void setUp() throws Exception {
        AmmoSellerRegBusinessServiceImpl  mockRegBusinessServiceImpl 
            = mock(AmmoSellerRegBusinessServiceImpl.class);
        PowerMockito.doReturn(mockRegBusinessServiceImpl)
            .when(BusinessServiceFactory.class,"getRegBusinessService",
            (mockEntityManager)); //--- line 84 null pointer exception
    }
}

我不明白为什么我会看到异常。如果有任何建议，我将不胜感激。

Answer 1

仅供引用:

解决方案是使用 PowerMockito.mock() 而不是 Mockito.mock()

---

你应该做的

AmmoSellerRegBusinessServiceImpl  mockRegBusinessServiceImpl 
        = PowerMockito.mock(AmmoSellerRegBusinessServiceImpl.class);

代替

AmmoSellerRegBusinessServiceImpl  mockRegBusinessServiceImpl 
            = mock(AmmoSellerRegBusinessServiceImpl.class);
// assuming your are using Mockito.mock()
// correct me if I am wrong

---

我也遇到了同样的问题。这个解决方案是我的解决方案。希望对您有所帮助。