I’m working on a simple Spring Boot project and I want to create a response object for 500 error.

This is the controller:

@RestController
@Slf4j
public class DataController {
    @PostMapping(value = "/data", consumes = "application/json", produces = "application/json")
    DataResponse createData(@RequestBody List<ClientRequest> completeRequest) throws Exception {
        log.info("completeRequest = {}", completeRequest);
        throw new Exception();
    }

Error

@Data
@Builder
@AllArgsConstructor
public class ErrorDTO {
    private final String code;
    private final String message;
    private final String text;
}

Exception handler:

@Slf4j
@ControllerAdvice
public class GlobalExceptionHandler {
    @ResponseBody
    @ExceptionHandler
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public ErrorDTO handleException(Exception exception) {
        log.error(exception.getMessage(), exception);
        return ErrorDTO.builder()
                .code(HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase())
                .message("Unexpected error!")
                .text("This is the text!")
                .build();
    }
}

When I call this API from Postman everything is fine and I get 500 Internal Server Error with response body:

{
    "code": "Internal Server Error",
    "message": "Unexpected error!",
    "text": "This is the text!"
}

But the problem is when I try to call this API from another microservice. I’m using RestTemplate like that:

try {
    ResponseEntity<ResponseDemo> result = restTemplate.postForEntity(uri, requestDemos, ResponseDemo.class);
    log.info("Success response: {}", result);
    ResponseDemo body = result.getBody();
    log.info("body= {}", body);
} catch (HttpClientErrorException | HttpServerErrorException ex) {
    log.error("ERROR at POST {}", ex.getMessage());
}

I receive only 500 Internal Server Error, I can’t find the Response Body

{
    "code": "Internal Server Error",
    "message": "Unexpected error!",
    "text": "This is the text!"
}

Can someone explain how to receive the response body also in the other service, not only in Postman? Thank you!