Response not coming back from one service to another service - microservices - web-services

Question

I am facing strange issue where response as string not coming back from one service to another service. we have created microservices where one service is calling another service. i can see response printed in logs . after that line immediately i am returning that response but its coming back as null.
I created similar method with same code and it works fine. I have put code for calling service and service method from which i am returning response.
controller:
#RequestMapping(value = "/test/save", method = RequestMethod.POST)
#ResponseBody
public String save(#RequestBody Calculation calculation,
HttpServletRequest request) {
logger.info("In .save");
String result = "false";
try {
result = CalService.save(calculation);
logger.info("Response from service is :" + result);
} catch (Exception e) {
logger.error("Exception occured in save:", e);
}
return result;
}
method call client :
public String saveCal(Calculation calculation) {
String result = null;
try {
logger.info("In save");
MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
headers.add("REMOTE_USER", "test");
HttpEntity<Calculation> request = new HttpEntity<Calculation>(Calculation, headers);
RestTemplate template = new RestTemplate();
template.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
result = template.postForObject(url+"/test/save", request, String.class);
} catch (Exception e) {
logger.error("Exception occured in SaveMddMd", e);
result = "fail";
}
logger.info("Save"+result);
return result;
}
result returned is success or failure.
I can see result printed in controller as success but when it comes back to client it prints as null. I created exact same method with different signature which returns result as success. we are using microservices here.
Jordan