Spring MVC 和 jackson 不支持内容类型“application/json”

Question

I'm getting an error (Handler execution resulted in exception: Content type 'application/json' not supported) when trying to receive a post request using Spring MVC.

My Json, just for testing, is pretty simple:

{ "test": "abc123" }

My pojo class:

public class Request {

    String test;

    public String getTest() {
        return test;
    }

    public void setTest(String test) {
        this.test = test;
    }

}

And my controller:

@RequestMapping(value = "/testing", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
private void testing(@RequestBody Request body, @RequestHeader HttpHeaders headers, HttpServletRequest httpRequest) {
    System.out.println(body.getTest());
}

In my pom.xml, I added:

<dependencies>
    ...
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.8.5</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
        <version>2.4.3</version>
    </dependency>
</dependencies>

I think that something is wrong in json deserialization, but I cannot find it.

Any help is welcome. Thanks.

Answer 1

Here is my working example:

@SpringBootApplication
@Controller
public class Application {

  public static void main(String[] args) {
    SpringApplication.run(Application.class);
  }


  @RequestMapping(value = "/testing", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
  @ResponseBody
  private void testing(@RequestBody Request body, @RequestHeader HttpHeaders headers, HttpServletRequest httpRequest) {
    System.out.println(body.getTest());
  }
}

This project has only 1 dependency:

org.springframework.boot:spring-boot-starter-web

When I call the url like this:

curl -XPOST -v -d '{ "test": "abc123" }' -H "Content-type: application/json" http://localhost:8080/testing

I see the correct abc123 in the logs. If I remove Content-type header I get the exception

org.springframework.web.HttpMediaTypeNotSupportedException","message":"Content type 'application/x-www-form-urlencoded' not supported

Answer 2

In my case the problem was an addition to a dto of a property which having a type that was error prone for Jackson, it was of type JsonObject. Jackson was unable to deserialize other objects because of that addition.
The exception message is completely inaccurate!

Answer 3

Add this Bean in your webconfig class

@Bean
public ContentNegotiatingViewResolver contentViewResolver() {
    ContentNegotiationManagerFactoryBean contentNegotiationManager = new ContentNegotiationManagerFactoryBean();
    contentNegotiationManager.addMediaType("json", MediaType.APPLICATION_JSON);

    InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
    viewResolver.setPrefix("/WEB-INF/jsp/");
    viewResolver.setSuffix(".jsp");

    MappingJackson2JsonView defaultView = new MappingJackson2JsonView();
    defaultView.setExtractValueFromSingleKeyModel(true);

    ContentNegotiatingViewResolver contentViewResolver = new ContentNegotiatingViewResolver();
    contentViewResolver.setContentNegotiationManager(contentNegotiationManager.getObject());
    contentViewResolver.setViewResolvers(Arrays.<ViewResolver> asList(viewResolver));
    contentViewResolver.setDefaultViews(Arrays.<View> asList(defaultView));
    return contentViewResolver;
}

UPDATE

The guys from the comments are right, this won't fix your issue but I noticed something.

If I set consumes = MediaType.APPLICATION_JSON_VALUE and in the request I don't specify the content type it will throw an exception then if I set the content type the issue is fixed.

Now, the issue seems to be something with your dependencies.

My pom dependencies:

 <properties>
     <springframework.version>4.1.9.RELEASE</springframework.version>
     <springframework.security.oauth.version>2.0.9.RELEASE</springframework.security.oauth.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    ...

</properties>

<dependencies>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>${springframework.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${springframework.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${springframework.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${springframework.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.security.oauth</groupId>
        <artifactId>spring-security-oauth2</artifactId>
        <version>${springframework.security.oauth.version}</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.3.1</version>
    </dependency>

    ...

</dependencies>

Answer 4

对于寻找此问题的其他任何人，我的Pojo类上必须至少有一个公共变量或吸气剂。

Answer 5

I had same issue. finally i resolved it. Actual error was in jackson lib. Here is the location and code snippet.

/* \.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.6.5\jackson-databind-2.6.5-sources.jar!\com\fasterxml\jackson\databind\DeserializationContext.java  406 */


public boolean hasValueDeserializerFor(JavaType type, AtomicReference<Throwable> cause) {
        try {
            return _cache.hasValueDeserializerFor(this, _factory, type);
        } catch (JsonMappingException e) {
            if (cause != null) {
                cause.set(e);
            }
        } catch (RuntimeException e) {
            if (cause == null) { // earlier behavior
                throw e;
            }
            cause.set(e);
        }
        return false;
    }

Answer 6

For those who use Spring Framework , not Spring Boot, and encounter this problem.

The root of this problem is:

• Spring need to ① recognize the "Content-Type", and ② convert the content to the parameter type we declared in the method's signature.

• The ' application/json ' is not supported, because, by default , the Spring cannot find a proper HttpMessageConverter to do the converting job , which is step ②.

Solution :

• We manually add a proper HttpMessageConverter into the Spring's configuration of our application .

Steps:

1. Choose the HttpMessageConverter's class we want to use. For Json, we can choose from "org.springframework.http.converter.json. JsonbHttpMessageConverter ", "org.springframework.http.converter.json. MappingJackson2HttpMessageConverter ", and so on .

2. Add the JsonbHttpMessageConverter object (or other kinds of Json HttpMessageConverter object ) to Spring's configuration , by calling the "public void configureMessageConverters (List<HttpMessageConverter<?>> converters)" method of the "WebMvcConfigurer" implementation class in our application. Inside the method, we can add any HttpMessageConverter object as needed, by using " converters.add() ".

3. Add correspond dependency into "pom.xml" file. For example, if you use the " JsonbHttpMessageConverter ", then you need to add the dependencies of " javax.json.bind-api " and " yasson ".