no suitable HttpMessageConverter found for response type

Solution 1:

From a Spring point of view, none of the HttpMessageConverter instances registered with the RestTemplate can convert text/html content to a ProductList object. The method of interest is HttpMessageConverter#canRead(Class, MediaType). The implementation for all of the above returns false, including Jaxb2RootElementHttpMessageConverter.

Since no HttpMessageConverter can read your HTTP response, processing fails with an exception.

If you can control the server response, modify it to set the Content-type to application/xml, text/xml, or something matching application/*+xml.

If you don't control the server response, you'll need to write and register your own HttpMessageConverter (which can extend the Spring classes, see AbstractXmlHttpMessageConverter and its sub classes) that can read and convert text/html.

Solution 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;
}

Solution 3:

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>

Solution 4:

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);
    }
}