Resttemplate: Change accept header to application/json

[adrian.hoehn]

How can I change a Accept-Header of a Resttemplate to application/json ?

RestTemplate restTemplate = new RestTemplate();
List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
converters.add(new MappingJacksonHttpMessageConverter());
converters.add(new StringHttpMessageConverter());
converters.add(new FormHttpMessageConverter());
restTemplate.setMessageConverters(converters);
//parameters has type MultiValueMap<String, String>
restTemplate.postForObject("http://localhost:8080/myrestapp/content", parameters, MultiValueMap.class);

But the post header is allways:
POST /apponizer-be/oauth/token HTTP/1.1
Accept: application/x-www-form-urlencoded, multipart/form-data
Content-Type: application/json;charset=UTF-8

and my rest server responses with JSON. Depending on that I've got allways the following error:
The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers ()

[adrian.hoehn]

it semas to be a bug. With the following code is the accept header ok:

RestTemplate restTemplate = new RestTemplate();
List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
converters.add(new MappingJacksonHttpMessageConverter());
restTemplate.setMessageConverters(converters);