关于java：MockMvc Sp??ring空指针

MockMvc Spring null Pointer

嗨，我是Spring测试框架的新手，我有以下代码要测试Spring MVC Controller：

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public ModelAndView viewChangePassword(ModelMap model, Principal principal, HttpServletRequest request) throws NSException, SQLException {
System.err.println("testing");
String name = principal.getName();

.....

}

请在控制器中找到以下字段和initBinder方法定义：

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@Autowired
private MessageSource msg;
@Autowired
private ApplicationMa applicationMa;
@Autowired
private SesVal sesVal;
@Autowired
private CommonManager commonManager;
@Autowired
private ApplicationListManager applicationListManager;
@Autowired
private QueryManager queryManager;
@Autowired
private Manager manager;
@Autowired
private FormBlankValidator formValidator;

@Autowired
private FormDataValidator dataValidator;

@InitBinder
protected void initBinder(HttpServletRequest request, WebDataBinder binder) {
SimpleDateFormat dateFormat = new SimpleDateFormat(Constants.DD_M_MYYYY);
dateFormat.setLenient(false);
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
}

这是我的单元测试，我也在使用Mockito：

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@RunWith(MockitoJUnitRunner.class)
public class ApplicationControllerTest {

@InjectMocks
private ApplicationController appController;
@Mock
Principal principal;

@Mock
private RequestAttributes requestAttributes;

@Mock
private SessionValidator sessionValidator;
@Mock
User user;

private MockMvc mockMvc;

@Before
public void setup() {

// Process mock annotations
//MockitoAnnotations.initMocks(this);

// Setup Spring test in standalone mode
RequestContextHolder.setRequestAttributes(requestAttributes);
this.mockMvc = MockMvcBuilders.standaloneSetup(appController).build();

}

@Test
public void viewChangePassword() throws Exception{

MockHttpServletRequest request = new MockHttpServletRequest();

when(principal.getName()).thenReturn("user1");
when(sessionValidator.isSessionValid(user)).thenReturn(true);

mockMvc.perform(
get("/viewChangePassword"))
.andExpect(view().name("denied")
);

}

运行单元测试时，显示以下空指针异常：

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Running com.controller.application.test.ApplicationControllerTest
log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
testing
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 1.063 sec <<< FAILURE! - in com.controller.application.test.ApplicationControllerTest
viewChangePassword(com.controller.application.test.ApplicationControllerTest) Time elapsed: 0.688 sec <<< ERROR!
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
at com.controller.application.test.ApplicationControllerTest.viewChangePassword(ApplicationControllerTest.java:117)
Caused by: java.lang.NullPointerException
at com.controller.application.test.ApplicationControllerTest.viewChangePassword(ApplicationControllerTest.java:117)

Results :

Tests in error:
ApplicationControllerTest.viewChangePassword:117 ?? NestedServlet Request proce...

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 4.423 s

这是第117行：

1	mockMvc.perform(

我不确定这里是否为null，请问如何解决此问题？

只需在同一类中指出此方法即可正常工作，没有任何问题：

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@Test
public void defaultPageTestOK() throws Exception{
mockMvc.perform(get("/"))
.andExpect(redirectedUrl("/view"))
.andExpect(status().isFound()

);

}

谢谢您的任何建议。