I don't konw Why Could not autowire. No beans of 'ObjectMapper' type found. (Annotation Error)

Question

I am working on a spring boot project. However, when @WebMvcTest annotation is used, there is no problem in objectmapper, but when using @AutoConfigureMockMvc, an error occurs in objectmapper. What's the problem?

@SpringBootTest
@ExtendWith(SpringExtension.class)
@AutoConfigureMockMvc
class EventControllerTest {

    @Autowired MockMvc mockMvc;
    @Autowired ObjectMapper objectMapper;

    @Test
    void createEVent() throws Exception {
        Event event = Event.builder()
                .id(100)
                .name("Spring")
                .description("REST API Development with Spring")
                .beginEventDateTime(LocalDateTime.of(2021, 10, 30, 12, 00))
                .closeEnrollmentDateTime(LocalDateTime.of(2021, 10, 31, 12, 00))
                .beginEnrollmentDateTime(LocalDateTime.of(2021, 11, 01, 12, 00))
                .endEventDateTime(LocalDateTime.of(2021, 11, 02, 12, 00))
                .basePrice(100)
                .maxPrice(200)
                .limitOfEnrollment(100)
                .location("Tokyo")
                .free(true)
                .offline(false)
                .build();

        mockMvc.perform(post("/api/event")
                .contentType(MediaType.APPLICATION_JSON)
                .accept(MediaTypes.HAL_JSON)
                .content(objectMapper.writeValueAsString(event)))
                .andDo(print())
                .andExpect(status().isCreated())
                .andExpect(jsonPath("id").exists())
                .andExpect(header().exists(HttpHeaders.LOCATION))
                .andExpect(header().string(HttpHeaders.CONTENT_TYPE, MediaTypes.HAL_JSON_VALUE))
                .andExpect(jsonPath("id").value(Matchers.not(100)))
                .andExpect(jsonPath("free").value(Matchers.not(true)));
    }
}

Check this: https://stackoverflow.com/questions/30060006/how-do-i-obtain-the-jackson-objectmapper-in-use-by-spring-4-1 — Digsb, Oct 31 '21 at 14:27
@Digsb Thanks for your reply. i tried `@Autowired Jackson2ObjectMapperBuilder builder;` but same error occurs — Jaeyeon, Nov 01 '21 at 02:07
@DEWA Kazuyuki - 出羽和之 Error message is "Could not autowire. No beans of 'Jackson2ObjectMapperBuilder' type found." same error occurs — Jaeyeon, Nov 01 '21 at 06:21

score 0 · Answer 1 · answered Oct 31 '21 at 16:39

The ObjectMapper is created by Jackson2ObjectMapperBuilder, and you can inject the builder using:

@SpringBootTest
@ExtendWith(SpringExtension.class)
@AutoConfigureMockMvc
class EventControllerTest {

    @Autowired MockMvc mockMvc;
@Autowired Jackson2ObjectMapperBuilder builder;

    @Test
    void createEVent() throws Exception {
        ObjectMapper objectMapper = builder.build();

        Event event = Event.builder()
                .id(100)
                .name("Spring")
                .description("REST API Development with Spring")
                .beginEventDateTime(LocalDateTime.of(2021, 10, 30, 12, 00))
                .closeEnrollmentDateTime(LocalDateTime.of(2021, 10, 31, 12, 00))
                .beginEnrollmentDateTime(LocalDateTime.of(2021, 11, 01, 12, 00))
                .endEventDateTime(LocalDateTime.of(2021, 11, 02, 12, 00))
                .basePrice(100)
                .maxPrice(200)
                .limitOfEnrollment(100)
                .location("Tokyo")
                .free(true)
                .offline(false)
                .build();

        mockMvc.perform(post("/api/event")
                .contentType(MediaType.APPLICATION_JSON)
                .accept(MediaTypes.HAL_JSON)
                .content(objectMapper.writeValueAsString(event)))
                .andDo(print())
                .andExpect(status().isCreated())
                .andExpect(jsonPath("id").exists())
                .andExpect(header().exists(HttpHeaders.LOCATION))
                .andExpect(header().string(HttpHeaders.CONTENT_TYPE, MediaTypes.HAL_JSON_VALUE))
                .andExpect(jsonPath("id").value(Matchers.not(100)))
                .andExpect(jsonPath("free").value(Matchers.not(true)));
    }
}

@Medhi Varse Thanks for your help!, But, Could not autowire. No beans of 'Jackson2ObjectMapperBuilder' type found. <- same error occurs. — Jaeyeon, Nov 01 '21 at 02:05

I don't konw Why Could not autowire. No beans of 'ObjectMapper' type found. (Annotation Error)

1 Answers1