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org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation in java spring boot

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I am developing chat application using java springboot and Angular 7. I am using events in spring boot and angular. I am trying to generate events in spring boot for angular to listen the event. However, I am getting following error:

Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]
Here is my controller code in springboot:
@CrossOrigin("*")
@RestController
@RequestMapping("/chat")
public class MessageController {
@Autowired
MessageService messageService;
@Autowired
private ApplicationEventPublisher applicationEventPublisher;
private static final Logger logger = LoggerFactory.getLogger(MessageController.class);
@PostMapping(consumes = "application/json", produces = "application/json")
public GenericApiResponse<Map<String, Object>>message(@RequestBody MessageRequest req) {
    logger.info("MessageController:: messagemethod [POST] /chat");
    GenericApiResponse<Map<String, Object>> responseObj = new GenericApiResponse<>();
    Object returnValue = new Object();
    try {
        returnValue = messageService.translateText(req);
    } catch (Exception e) {
        e.printStackTrace();
        logger.error("EXCEPTION: "+e.getStackTrace().toString());
        responseObj.setStatus(Constants.ERROR);
        responseObj.setMessage("Internal Server Error");
    Map<String, Object> resMap = new HashMap<>();
    resMap.put("result", returnValue);
    resMap.put("sender", req.getSender());
    responseObj.setResponseObject(resMap);
    responseObj.setStatus(Constants.SUCCESS);
    MessageEvent messageEvent = new MessageEvent(this,"eventName", responseObj);
    applicationEventPublisher.publishEvent(messageEvent);
    return responseObj;
I am unable to figure out what is the issue and how to solve it. Please help me to solve this issue.
Thanks in advance :)
                curl -X POST \ http://localhost:8090/chat\ -H 'Accept: */*' \ -H 'Accept-Encoding: gzip, deflate' \ -H 'Cache-Control: no-cache' \ -H 'Connection: keep-alive' \ -H 'Content-Length: 134' \ -H 'Content-Type: application/json' \ -H 'Cookie: JSESSIONID=349102FC07B387A5D2629995D508210F' \ -H 'Host: localhost:8090' \ -H 'cache-control: no-cache' \ -d '{ "text" : "I can do this now", "sourceLanguageCode" : "en", "targetLanguageCode" : "hi", "sender" : "abc" }
– Bhushan Mahajan
                Oct 22, 2019 at 8:25
@ResponseBody is added but no response is returned i.e. method type is void.
produces = "application/json" doesn't make sense for a void method returning no response.
Hence, for a rest endpoint always return some response. You can fix it by putting following as return statement in the end in your method:
return ResponseEntity.ok("your message");
Also, @ResponseBody means that response is always serialized to json hence, no need to specify , produces = "application/json" explicitly.
Update: 
Can you please also try replacing consumes = "application/json", produces = "application/json" with 
  consumes = MediaType.APPLICATION_JSON_VALUE, 
  produces = MediaType.APPLICATION_JSON_VALUE
ensure that request headers are set to application/json.
Also, ensrue jackson dependencies are in place.
                Hi, now I am returning the responseObj, so added GenericApiResponse<Map<String, Object>> as return type. And therefore I am keeping produces= "application/json" as it is. But still it is giving me same error
– Bhushan Mahajan
                Oct 22, 2019 at 6:55
                Yes, I have removed @ResponseBody as I am keeping produces= "application/json". My request body contains: sender and text.
– Bhushan Mahajan
                Oct 22, 2019 at 7:29
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