I have updated the Spring boot version from 2.7.14 to 3.2.4 in existing application. Rest everything remains same, but it is giving 415 unsupported media type.

I have spend days on this, but do not have any clue about it.

RestTemplate Configs –

@Configuartion
public class RestTemplateConfiguration {
    @Bean
    public RestTemplate restTemplate(RestTemplateFactory resTemplateFactory) {
        RestTemplate resTemplate = resTemplateFactory.restTemplate();
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setOutputStreaming(false);
        ClientRequestFactory factory = new BufferingClientHttpRequestFactory(requestFactory);
        restTemplate.setRequestFactory(factory);
        restTemplate.getInterceptors().add(new AddResponseBodyWrapperInterceptor());
        return resTemplate;
    }
}

Calling class –

@Service
@RequiredArgsConstructor
public class ExternalApiService {
    private final RestTemplae restTemplate;
    
    public ResponseEntity<JsonNode> exchange(URI uri, HttpMethod method, HttpEntity<JsonNode> httpEntity) {
     try {
         ResponseEntity<JsonNode> response = restTemplate.exchange(uri, method, httpEntity, JsonNode.class);
         return ResponseEntity.status(response.getStatusCode())
                  .headers(//code here)
                  .body(response.getBody());
     } catch (HttpStatusCodeException ex) {
        // exception handling
     }
  }
}

I have tried adding logging in the interceptor. Both before and after updating the spring boot version have same request headers and payload.

accept: "application/json, text/plain, application/xml, application/*+json, application/*+xml, */*",
accep-encoding: "gzip, x-gzip, deflat",
content-length: "0",
host: "localhost:9060",
connection: "keep-alive",
user-agent: "Apache-HttpClient/5.2.3 (Java/17.0.10)"

The exact same code work with Spring boot 2.7.14, but fails with 3.2.4.

Any suggestion would be appreciated. Thanks in advance.