send and get JSON data using Rest Template api call

GetData.java

    @PostMapping(value = MY_URL, produces = MediaType.APPLICATION_JSON_VALUE)
    @ApiResponse(code = 200, message = "OK")
    public void getData(@RequestBody String data) {
        String val = data;
    }

SendData.java

public void sendData() {
        try {
            HttpHeaders headers = new HttpHeads();
            JSONObject requestBody = new JSONObject();
            requestBody.put("data", "Hello world");
            HttpEntity<String> requestEntity = new HttpEntity<>(requestBody.toString(), headers);
            String url = "your url";
            restTemplate.exchange(url , HttpMethod.POST, requestEntity, String.class);
        } catch (RestClientException ex) {
            log.error("Error while sending data : " + ex);
        }
    }