[Springboot] HttpMediaTypeNotAcceptableException 에러

ContentNegotiatingViewResolver 학습을 위해 JSON -> XML 반환하는 API를 작성했다.
demospringmvc 프로젝트의 craeteUser_XML 예시 참고

    @Test
    public void createUser_XML() throws Exception {
        String userJson = "{\"username\":\"yeoseon\", \"password\":\"123\"}";

        mockMvc.perform(post("/users/create")
                .contentType(MediaType.APPLICATION_JSON_UTF8)
                .accept(MediaType.APPLICATION_XML)
                .content(userJson))
                .andExpect(status().isOk())
                .andExpect(xpath("/User/name").string("yeoseon"))
                .andExpect(xpath("/User/password").string("123"));
    }

다음과 같은 406 에러가 발생했다.

MockHttpServletRequest:
      HTTP Method = POST
      Request URI = /users/create
       Parameters = {}
          Headers = {Content-Type=[application/json;charset=UTF-8], Accept=[application/xml]}
             Body = {"username":"yeoseon", "password":"123"}
    Session Attrs = {}

Handler:
             Type = me.yeoseon.user.UserController
           Method = public me.yeoseon.user.User me.yeoseon.user.UserController.create(me.yeoseon.user.User)

Async:
    Async started = false
     Async result = null

Resolved Exception:
             Type = org.springframework.web.HttpMediaTypeNotAcceptableException

ModelAndView:
        View name = null
             View = null
            Model = null

FlashMap:
       Attributes = null

MockHttpServletResponse:
           Status = 406
    Error message = null
          Headers = {}
     Content type = null
             Body = 
    Forwarded URL = null
   Redirected URL = null
          Cookies = []

java.lang.AssertionError: Status 
Expected :200
Actual   :406
<Click to see difference>

    at org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:55)
    at org.springframework.test.util.AssertionErrors.assertEquals(AssertionErrors.java:82)
    at org.springframework.test.web.servlet.result.StatusResultMatchers.lambda$matcher$9(StatusResultMatchers.java:619)
    at org.springframework.test.web.servlet.MockMvc$1.andExpect(MockMvc.java:178)
    at me.yeoseon.user.UserControllerTest.createUser_XML(UserControllerTest.java:52)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

2020-09-22 10:36:39.371  INFO 3749 --- [       Thread-1] o.s.w.c.s.GenericWebApplicationContext   : Closing org.springframework.web.context.support.GenericWebApplicationContext@3542162a: startup date [Tue Sep 22 10:36:37 KST 2020]; root of context hierarchy

Process finished with exit code 255

원인

HttpMediaTypeNotAcceptableException - 해당 MediaType이 Not Acceptable하다.
= 이 MediaType의 요청-응답을 처리할 HttpMessageConverter가 없는 것이다.

HttpMessageConvertersAutoConfiguration

HttpMessageConverter는 HttpMessageConvertersAutoConfiguration를 통해서 적용이 된다.

클래스를 한번 열어보자. (Shift 두번 다닥!)

@Configuration
@ConditionalOnClass({HttpMessageConverter.class})
@AutoConfigureAfter({GsonAutoConfiguration.class, JacksonAutoConfiguration.class, JsonbAutoConfiguration.class})
@Import({JacksonHttpMessageConvertersConfiguration.class, GsonHttpMessageConvertersConfiguration.class, JsonbHttpMessageConvertersConfiguration.class})
public class HttpMessageConvertersAutoConfiguration {
...
}

을 통해 JacksonHttpMessageConvertersConfiguration을 열어보자.

다음과 같이 Xml을 처리하는 Converters는 XmlMapper가 classpath에 있을 때만 사용할 수 있도록 Annotation이 Setting 되어있다는 것을 볼 수 있다.

해결

이 의존성을 추가해준다.

<dependency>
   <groupId>com.fasterxml.jackson.dataformat</groupId>
   <artifactId>jackson-dataformat-xml</artifactId>
   <version>2.9.6</version>
</dependency>

yeoseon / tip-archive

[Springboot] HttpMediaTypeNotAcceptableException 에러 #246

원인

HttpMessageConvertersAutoConfiguration

해결