Circular view path [home]: would dispatch back to the current handler URL [/home] again. Check your ViewResolver setup!

public class WebConfig extends WebMvcConfigurerAdapter { //配置JSP视图解析器
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
}
}

@Controller
public class HomeController {
@RequestMapping(value = "/home", method=GET)
public ModelAndView home() {
String message = "Hello";
return new ModelAndView("home", "home", message);
}
}

public class HomeControllerTest {
@Test
public void testHomePage() throws Exception {
HomeController controller = new HomeController();
MockMvc mockMvc = standaloneSetup(controller).build();
mockMvc.perform(get("/home")).andExpect(view().name("home"));
}}

Circular view path [home]: would dispatch back to the current handler URL [/home] again. Check your ViewResolver setup!
(Hint: This may be the result of an unspecified view, due to default view name generation.)

if (path.startsWith("/") ? uri.equals(path) : uri.equals(StringUtils.applyRelativePath(uri, path))) {
throw new ServletException("Circular view path [" + path + "]: would dispatch back " +
"to the current handler URL [" + uri + "] again. Check your ViewResolver setup! " +
"(Hint: This may be the result of an unspecified view, due to default view name generation.)");
}

public class TestJavaConfig { private MockMvc mockMvc; @InjectMocks
private StudentController studentController; @Mock
private StudentService studentService; @Before
public void setUp(){
MockitoAnnotations.initMocks(this);
InternalResourceViewResolver resolver = new InternalResourceViewResolver(); //在test中重新配置视图解析器
resolver.setPrefix("/WEB_INF/views");
resolver.setSuffix(".jsp");
mockMvc = MockMvcBuilders.standaloneSetup(studentController).setViewResolvers(resolver).build(); }
@Test
public void testList()throws Exception{
mockMvc.perform(get("/home")).andExpect(view().name("home"));
}