Spring rest template cannot convert from text/html - json

Question

Spring rest template throws me the following exeption
org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class [Lcom.flightsms.core.dto.AirlineResponseDTO;] and content type [text/html;charset=UTF-8]
Here my json response
[
{
"airlineId": "1",
"nameAirline": "American Airlines",
"codeIataAirline": "AA",
"iataPrefixAccounting": "1",
"codeIcaoAirline": "AAL",
"callsign": "AMERICAN",
"type": "scheduled",
"statusAirline": "active",
"sizeAirline": "963",
"ageFleet": "10.9",
"founding": "1934",
"codeHub": "DFW",
"nameCountry": "United States",
"codeIso2Country": "US"
}
]
dto class
#Data
public class AirlineResponseDTO {
private String airlineId;
private String nameAirline;
private String codeIataAirline;
private String iataPrefixAccounting;
private String codeIcaoAirline;
private String callsign;
private String type;
private String statusAirline;
private String sizeAirline;
private String ageFleet;
private String founding;
private String codeHub;
private String nameCountry;
private String codeIso2Country;
}
I suspect that the matter is in the converter. I changed the converter configuration but this did not work
#Configuration
public class MvcConfigSupport extends WebMvcConfigurationSupport {
protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
converters.add(converter());
addDefaultHttpMessageConverters(converters);
}
#Bean
MappingJackson2HttpMessageConverter converter() {
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setSupportedMediaTypes(Arrays.asList(MediaType.TEXT_HTML));
return converter;
}
}

Answer 1

Problem solved.
#Bean
public RestTemplate restTemplate() {
RestTemplate restTemplate = new RestTemplate();
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setSupportedMediaTypes(Collections.singletonList(MediaType.TEXT_HTML));
restTemplate.getMessageConverters().add(converter);
return restTemplate;
}

Answer 2

Try something like that the default converters are not registered by default and an end user has to be explicit about registering the defaults :
#Configuration
public class WebConfig extends WebMvcConfigurationSupport {
#Bean
public MappingJackson2HttpMessageConverter customJackson2HttpMessageConverter() {
MappingJackson2HttpMessageConverter jsonConverter =
new MappingJackson2HttpMessageConverter();
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(
DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);
jsonConverter.setObjectMapper(objectMapper);
return jsonConverter;
}
#Override
public void configureMessageConverters(List<HttpMessageConverter<?>>
converters) {
converters.add(customJackson2HttpMessageConverter());
super.addDefaultHttpMessageConverters();
}
}
Moreover please try fix type exception. Content type [text/html;charset=UTF-8] received from the service, the real content type should be application/json;charset=UTF-8
To get all ContentType you can do your custom converter like that:
List<HttpMessageConverter<?>> messageConverters =
new ArrayList<HttpMessageConverter<?>>();
MappingJackson2HttpMessageConverter converter =
new MappingJackson2HttpMessageConverter();
converter.setSupportedMediaTypes(Arrays.asList({MediaType.ALL}));
messageConverters.add(converter);
restTemplate.setMessageConverters(messageConverters);

Answer 3

Use RestTemplateBuilders to create the resttemplate clients. The builders will add the default Message converters.