CODEWITHSUNDEEP
springspring-boothttp
Hargun Suri
Hargun Suri

Reputation: 311

org.springframework.web.client.RestClientException: No HttpMessageConverter for SampleRequest

I am new to Sping Boot and I am trying to call External POST API using RestTemplate but getting error No HttpMessageConverter for SampleRequest.

Below is my Controller class I have also tried converting the message but it did not helped me.

Controller Class :

import com.SampleRequest;

@RestController
@RequestMapping(path = "/api")
public class TicketAgentController {

private static final Logger LOGGER = LogManager.getLogger(TicketAgentController);

@PostMapping(path = "/TicketAgent", consumes = "application/json", produces = "application/json")
public String createTroubleTicket(@RequestBody SampleRequest request) throws URISyntaxException {

    //Move to Common and service
    RestTemplate restTemplate = new RestTemplate();
    restTemplate.setMessageConverters(getMessageConverters());


    final String baseUrl = "http://172.100.5.89:8095/api/Ticket/v2";
    URI uri = new URI(baseUrl);

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);

    LOGGER.info("Start ..");

    String result = restTemplate.postForObject(uri, request, String.class);

    LOGGER.info("Result :" + result);
    LOGGER.info("End ..");

    return result;

}

//Move to Common
private List<HttpMessageConverter<?>> getMessageConverters() {
    List<HttpMessageConverter<?>> converters = 
      new ArrayList<HttpMessageConverter<?>>();
    converters.add(new MappingJackson2HttpMessageConverter());
    return converters;
}

}

Exception After running :

2019-12-17 12:11:38.943 ERROR 9240 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.RestClientException: No HttpMessageConverter for com.SampleRequest with root cause

org.springframework.web.client.RestClientException: No HttpMessageConverter for com.SampleRequest at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:964) ~[spring-web-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:740) ~[spring-web-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:717) ~[spring-web-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:443) ~[spring-web-5.2.2.RELEASE.jar:5.2.2.RELEASE]

Let me know if I need to provide anything more.

Upvotes: 1

Views: 7889

Answers (2)

suthar_arun
suthar_arun

Reputation: 109

I faced the same issue on debugging I found that I haven't defined getter methods for the sample request pojo which were leading me to the same error.

Upvotes: 5

Dmitry Ionash
Dmitry Ionash

Reputation: 821

RestTemplate does not know anything about your object SampleRequest and its serialization. I think the simplest way to use ObjectMapper:

...
var headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
var entity = new HttpEntity<>(mapper.writeValueAsString(request), headers);
var result = restTemplate.postForObject(uri, entity, String.class);
...

You can Autowire ObjectMapper mapper or create new one.

Upvotes: 2

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