POST JSON object using Spring REST template

I am posting JSON object using spring rest template. It works fine for less data, but posting more data throws a Request URI too long error.

       final String url = getServiceUrl() +"/rs/doc?param1=test";        RestTemplate restTemp=getRestTemplate();        HttpHeaders headers = new HttpHeaders();        headers.setContentType(org.springframework.http.MediaType.APPLICATION_JSON);        //set your entity to send        HttpEntity<MyBean> request = new HttpEntity<MyBean>(myBean,headers);        List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();        messageConverters.add(new MappingJacksonHttpMessageConverter());        messageConverters.add(new FormHttpMessageConverter());        restTemp.getMessageConverters().addAll(messageConverters);        // send it!        responseEntity = restTemp.exchange(url, HttpMethod.POST, request, String.class);

The request body should accept unlimited data in POST method. But that doesn't seem to work here. Can someone please guide.