org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable...

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

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