spring feign client exception handling

Question

I have some fiegn client to send request other micro service.

@FeignClient(name=\"userservice\")
public interface UserClient {

    @RequestMapping(
                    


        

Answer 1

did you try to implement FallbackFactory on your feign client ?

https://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-feign.html#spring-cloud-feign-hystrix-fallback

On the create method, before return, you can retrieve the http status code with this snippet :

String httpStatus = cause instanceof FeignException ? Integer.toString(((FeignException) cause).status()) : "";

Exemple :

@FeignClient(name="userservice", fallbackFactory = UserClientFallbackFactory.class)
public interface UserClient {

    @RequestMapping(
            method= RequestMethod.GET,
                      path = "/userlist")
    String getUserByid(@RequestParam(value ="id") String id);

}


@Component
static class UserClientFallbackFactory implements FallbackFactory<UserClient> {
    @Override
    public UserClient create(Throwable cause) {

     String httpStatus = cause instanceof FeignException ? Integer.toString(((FeignException) cause).status()) : "";

     return new UserClient() {
        @Override
        public String getUserByid() {
            logger.error(httpStatus);
            // what you want to answer back (logger, exception catch by a ControllerAdvice, etc)
        }
    };
}

}

Answer 2

There's a ErrorDecored interface for that like it says in the documentation

The answer above about FallbackFactory is viable but falls into some other layer of abstraction.

Answer 3

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