Spring boot记录下常见错误

记录下spring boot中常用的错误
1.Spring test出现如下错误
java.lang.IllegalStateException: Unable to find a @SpringBootConfiguration, you need to use @ContextConfiguration or @SpringBootTest(classes=...) with your test
代码如下

@RunWith(SpringRunner.class)
@SpringBootTest
//@SpringBootTest(classes=DemoApplication.class)
public class UserControllerTest {

    @Autowired
    private WebApplicationContext wac;


    private MockMvc mockMvc;

    @Before
    public void setup() {
        mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();
    }

    @Test
    public void whenQuerySuccess() throws Exception {

        mockMvc.perform(MockMvcRequestBuilders.get("/user")
                .contentType(MediaType.APPLICATION_JSON_UTF8))
                .andExpect(MockMvcResultMatchers.status().isOk())
                .andExpect(MockMvcResultMatchers.jsonPath("$.length()")
                        .value(3));

    }
}

可以在@SpringBootTest指定对应的Spring的启动类既可以解决.