Java MockMvc-Spring空指针

您好，我是Spring测试框架的新手，我需要测试以下Spring MVC控制器代码：

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

        .....

        }

请查找控制器中定义的以下字段和initBinder方法：

  @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：

@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")                
                );

     }

当我运行单元测试时，会显示以下空指针异常：

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

我不确定这里什么是空的，你知道怎么解决吗

只需指出，在同一类中，此方法运行良好，没有问题：

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

                );

    }

---

提前感谢您的建议。

尽管最初的问题在几年前就已经报告过了，但我遇到了相同的问题-mockMvc.perform（）上的NullPointerException

经过大量调试后，我发现我为验证请求而编写的自定义JWT筛选器中存在空指针问题，在perform（）方法本身上被报告为NullPointerException

---

一旦我修复了过滤器以避免空指针异常，一切都开始工作。

是正确的

注释之前的

:
org.junit.Before
而不是
org.aspectj.lang.annotation.Before
（或其他一些）？是的，它是org.junit.Before您检查过这里吗？检查了它，但在添加标题后仍然出现相同的错误ApplicationController有哪些字段和构造函数？
   @Test
     public void defaultPageTestOK() throws Exception{
        mockMvc.perform(get("/"))
                .andExpect(redirectedUrl("/view"))  
                .andExpect(status().isFound()

                );

    }