spring feign client exception handling

Not the same issue, but this helped in my situation. OpenFeign's FeignException doesn't bind to a specific HTTP status (i.e. doesn't use Spring's @ResponseStatus annotation), which makes Spring default to 500 whenever faced with a FeignException. That's okay because a FeignException can have numerous causes that can't be related to a particular HTTP status.

However you can change the way that Spring handles FeignExceptions. Simply define an ExceptionHandler that handles the FeignException

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(FeignException.class)
    public String handleFeignStatusException(FeignException e, HttpServletResponse response) {
        response.setStatus(e.status());
        return "feignError";
    }

}

This example makes Spring return the same HTTP status that you received

I'm late to party but here are my 2 cents. We had same use case to handle exceptions based on error code and we used custom ErrorDecoder.

public class CustomErrorDecoder implements ErrorDecoder {

    @Override
    public Exception decode(String methodKey, Response response) {
        String requestUrl = response.request().url();
        Response.Body responseBody = response.body();
        HttpStatus responseStatus = HttpStatus.valueOf(response.status());

        if (responseStatus.is5xxServerError()) {
            return new RestApiServerException(requestUrl, responseBody);
        } else if (responseStatus.is4xxClientError()) {
            return new RestApiClientException(requestUrl, responseBody);
        } else {
            return new Exception("Generic exception");
        }
    }
}

Return @Bean of above class in FeignClientConfiguration class.

public class MyFeignClientConfiguration {

    @Bean
    public ErrorDecoder errorDecoder() {
        return new CustomErrorDecoder();
    }
}

Use this as your config class for FeignClient.

@FeignClient(value = "myFeignClient", configuration = MyFeignClientConfiguration.class)

Then you can handle these exceptions using GlobalExceptionHandler.