no suitable HttpMessageConverter found for response type

Question

Using spring, with this code :

List> messageConverters = restTemplate.getMessageConverters();
for(HttpMessageConverter ht         


        

Answer 1

If you can't change server media-type response, you can extend GsonHttpMessageConverter to process additional support types

public class MyGsonHttpMessageConverter extends GsonHttpMessageConverter {
    public MyGsonHttpMessageConverter() {
        List<MediaType> types = Arrays.asList(
                new MediaType("text", "html", DEFAULT_CHARSET),
                new MediaType("application", "json", DEFAULT_CHARSET),
                new MediaType("application", "*+json", DEFAULT_CHARSET)
        );
        super.setSupportedMediaTypes(types);
    }
}

Answer 2

You could also simply tell your RestTemplate to accept all media types:

@Bean
public RestTemplate restTemplate() {
   final RestTemplate restTemplate = new RestTemplate();

   List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
   MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
   converter.setSupportedMediaTypes(Collections.singletonList(MediaType.ALL));
   messageConverters.add(converter);
   restTemplate.setMessageConverters(messageConverters);

   return restTemplate;
}

Answer 3

Try this:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.6.0</version>
</dependency>

Answer 4

If you are using Spring Boot, you might want to make sure you have the Jackson dependency in your classpath. You can do this manually via:

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

Or you can use the web starter:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>