404 while using Spring cloud FeignClients

Question

This is my setup:

First service(FlightIntegrationApplication) which invoke second service(BaggageServiceApplication) using FeignClients API and Eureka.

Project on github: https://github.com/IdanFridman/BootNetflixExample

First service:

@SpringBootApplication
@EnableCircuitBreaker
@EnableDiscoveryClient
@ComponentScan("com.bootnetflix")
public class FlightIntegrationApplication {

    public static void main(String[] args) {
        new SpringApplicationBuilder(FlightIntegrationApplication.class).run(args);
    }

}

in one of the controllers:

    @RequestMapping("/flights/baggage/list/{id}")
    public String getBaggageListByFlightId(@PathVariable("id") String id) {
        return flightIntegrationService.getBaggageListById(id);
    }

FlightIntegrationService:

    public String getBaggageListById(String id) {
        URI uri = registryService.getServiceUrl("baggage-service", "http://localhost:8081/baggage-service");
        String url = uri.toString() + "/baggage/list/" + id;
        LOG.info("GetBaggageList from URL: {}", url);

        ResponseEntity<String> resultStr = restTemplate.getForEntity(url, String.class);
        LOG.info("GetProduct http-status: {}", resultStr.getStatusCode());
        LOG.info("GetProduct body: {}", resultStr.getBody());
        return resultStr.getBody();

    }

RegistryService:

@Named
public class RegistryService {

    private static final Logger LOG = LoggerFactory.getLogger(RegistryService.class);


    @Autowired
    LoadBalancerClient loadBalancer;

    public URI getServiceUrl(String serviceId, String fallbackUri) {
        URI uri;
        try {
            ServiceInstance instance = loadBalancer.choose(serviceId);
            uri = instance.getUri();
            LOG.debug("Resolved serviceId '{}' to URL '{}'.", serviceId, uri);

        } catch (RuntimeException e) {
            // Eureka not available, use fallback
            uri = URI.create(fallbackUri);
            LOG.error("Failed to resolve serviceId '{}'. Fallback to URL '{}'.", serviceId, uri);
        }

        return uri;
    }

}

And this is the second service (baggage-service):

BaggageServiceApplication:

@Configuration
@ComponentScan("com.bootnetflix")
@EnableAutoConfiguration
@EnableEurekaClient
@EnableFeignClients
public class BaggageServiceApplication {


    public static void main(String[] args) {
        new SpringApplicationBuilder(BaggageServiceApplication.class).run(args);
    }

}

BaggageService:

@FeignClient("baggage-service")
public interface BaggageService {

    @RequestMapping(method = RequestMethod.GET, value = "/baggage/list/{flight_id}")
    List<String> getBaggageListByFlightId(@PathVariable("flight_id") String flightId);


}

BaggageServiceImpl:

@Named
public class BaggageServiceImpl implements BaggageService{

....

    @Override
    public List<String> getBaggageListByFlightId(String flightId) {
        return Arrays.asList("2,3,4");
    }

}

When invoking the rest controller of flight integration service I get:

2015-07-22 17:25:40.682  INFO 11308 --- [  XNIO-2 task-3] c.b.f.service.FlightIntegrationService   : GetBaggageList from URL: http://X230-Ext_IdanF:62007/baggage/list/4
2015-07-22 17:25:43.953 ERROR 11308 --- [  XNIO-2 task-3] io.undertow.request                      : UT005023: Exception handling request to /flights/baggage/list/4

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.client.HttpClientErrorException: 404 Not Found
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)

Any idea ?

Thanks, ray.

Answer 1

Your code looks backwards to me.

The feign client for the baggage service should be declared in the flight service and the baggage service should have a controller that responds on the URL you map in your baggage service client, you should not implement the interface annotated with @FeignClient.

The setup you have now will not have any controller listening on /baggage/list/{flightId} in the baggage service and no Feign client in flight service - the whole point of Feign is to call methods on an interface instead of manually handling URLs, Spring Cloud takes care of auto-instantiating the interface implementation and will use Eureka for discovery.

Try this (or modify so it fits your real world app):

Flight Service:

FlightIntegrationService.java:

@Component
public class FlightIntegrationService {

    @Autowired
    BaggageService baggageService;

    public String getBaggageListById(String id) {
        return baggageService.getBaggageListByFlightId(id);
    }
}

BaggageService.java:

@FeignClient("baggage-service")
public interface BaggageService {

    @RequestMapping(method = RequestMethod.GET, value = "/baggage/list/{flight_id}")
    List<String> getBaggageListByFlightId(@PathVariable("flight_id") String flightId);   
}

Baggage Service:

BaggageController.java:

@RestController
public class BaggageController {

    @RequestMapping("/baggage/list/{flightId}")
    public List<String> getBaggageListByFlightId(@PathVariable String flightId) {
        return Arrays.asList("2,3,4");
    }
}

Remove BaggageService.java and BaggageServiceImpl.java from the Baggage Service