How to throw a custom exception in a @FeignClient's fallback class?

[ZengRed]

Hi, I'd like to throw a custom exception in a @FeignClient's fallback class then a springBoot's @ExceptionHandler will handle this custom exception: ` @Component public class HotelUserClientFallback implements HotelUserClient {

@Override
public DTO hello() {
    throw MyException("service is not avaiable...");
}

} `

But a HystrixRunTimeException is caught by @ExceptionHandler.

Any thing i can do to solve it?

[pratikdandavate]

I found another way to handle the exception in try-catch block that might help you instead of throwing an exception from fallback.

                     try {
                               //Code to handle
                     }
                     catch (Exception e) {
                // handling feign exception
                if (e instanceof HystrixRuntimeException) {
                    if (e.getCause() instanceof FeignException) {
                        Map<String, Object> handleFeignStatusException = handleFeignStatusException(
                                (FeignException) e.getCause(), response);
                        String reason = (String) handleFeignStatusException.get("message");
                        System.out.println(reason);
                        log.error("Error in : " + mappingData.get(i) + " Reason : " + reason);
                    }
                                  }
                               }
                          }

public Map<String, Object> handleFeignStatusException(FeignException e, HttpServletResponse response) {
        response.setStatus(e.status());
        return new JSONObject(e.contentUTF8()).toMap();
    }

[alibbbian]

@FeignClient(name = "${feign.client.mqtt-service:mqtt-service}", path = "/statistics"
        , fallbackFactory = MqttServiceStatisticsFeignClientFallBackFactory.class, configuration = YourConfiguration.class)

public class YourConfiguration {
       @Bean 
       public feign.codec.ErrorDecoder errorDecoder() {
              return new YourErrorDecoder();
       }
}

custum feign.codec.ErrorDecoder