How can I tell RestTemplate to POST with UTF-8 encoding?

Question

I'm having problems posting JSON with UTF-8 encoding using RestTemplate. Default encoding for JSON is UTF-8 so the media type shouldn't even contain the charset. I have tried to put charset in the MediaType but it doesn't seem to work anyway.

My code:

String dataJson = "{\"food\": \"smörrebröd\"}";
HttpHeaders headers = new HttpHeaders();
MediaType mediaType = new MediaType("application", "json", StandardCharsets.UTF_8);
headers.setContentType(mediaType);

HttpEntity<String> entity = new HttpEntity<String>(dataJson, headers);
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<Boolean> formEntity = restTemplate.exchange(postUrl, HttpMethod.POST, entity, Boolean.class);

Answer 1

You need to add StringHttpMessageConverter to rest template's message converter with charset UTF-8. Like this

RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters()
        .add(0, new StringHttpMessageConverter(StandardCharsets.UTF_8));