Struggling to get SpringCloud Feign to work with external services - spring-cloud

Question

Using Feign to access services that I register on Eureka is a breeze. I am trying to use Feign to access external services and struggling with the basics.
I am playing with a service on Bluemix however to simplify the problem at hand, I am using a simple service.
My Proxy appears as follows:
//#FeignClient(name = "country-service-client", url = "https://country.io")
#FeignClient(name = "another-country-service-client", url = "http://restcountries.eu/rest/v2/name/Australia")
public interface SimpleServiceProxy {
//This one works
#RequestMapping(method = RequestMethod.GET, value = "/names.json", produces = "application/json")
String getCountries();
//This one does not work... This is used in conjunction where the url in the Fiegn Client annotation reads as - http://restcountries.eu/rest/v2
#RequestMapping(method = RequestMethod.GET, value = "/name/{country}", produces = "application/json")
public String getCountryInfo(#PathVariable("country") String country);
//This one doesn't work either
//#RequestMapping(method = RequestMethod.GET, value = "/name/Australia", produces = "application/json")
public String getCountryInfoHardcodedWithinMethod();
}
//This works however I would want to pass parameters and path variables to the URL
#RequestMapping(method = RequestMethod.GET, produces = "application/json")
public String getCountryInfoHardcodedAtFeignClientAnnotation();
}
I have tried a few variants (see the code above) and the last one where the URL is hardcoded at the Feign Client annotation works. The others throw a TimeoutException.
java.util.concurrent.TimeoutException: null
at com.netflix.hystrix.AbstractCommand.handleTimeoutViaFallback(AbstractCommand.java:958) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.AbstractCommand.access$400(AbstractCommand.java:59) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.AbstractCommand$11.call(AbstractCommand.java:573) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.AbstractCommand$11.call(AbstractCommand.java:565) ~[hystrix-core-1.5.3.jar:1.5.3]
at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:139) ~[rxjava-1.1.5.jar:1.1.5]
at rx.internal.operators.OperatorDoOnEach$1.onError(OperatorDoOnEach.java:71) ~[rxjava-1.1.5.jar:1.1.5]
at rx.internal.operators.OperatorDoOnEach$1.onError(OperatorDoOnEach.java:71) ~[rxjava-1.1.5.jar:1.1.5]
at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$1.run(AbstractCommand.java:1099) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.strategy.concurrency.HystrixContextRunnable$1.call(HystrixContextRunnable.java:41) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.strategy.concurrency.HystrixContextRunnable$1.call(HystrixContextRunnable.java:37) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.strategy.concurrency.HystrixContextRunnable.run(HystrixContextRunnable.java:57) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$2.tick(AbstractCommand.java:1116) ~[hystrix-core-1.5.3.jar:1.5.3]
at com.netflix.hystrix.util.HystrixTimer$1.run(HystrixTimer.java:99) ~[hystrix-core-1.5.3.jar:1.5.3]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_112]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) ~[na:1.8.0_112]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) ~[na:1.8.0_112]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) ~[na:1.8.0_112]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_112]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_112]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_112]
I am puzzled and trying to figure things out. I want to get the hardcoded methods working before trying to figure out why the PathVariables aren't working.
What am I missing? (or doing incorrectly here)?

Answer 1

I just tried this simple application and it worked fine for me using
Dalston.RC1
#SpringBootApplication
#EnableFeignClients
#RestController
public class DemoApplication {
#Autowired
SimpleServiceProxy proxy;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
#RequestMapping("/")
public String getCountry() {
return proxy.getCountryInfo("Australia");
}
}
#FeignClient(name = "another-country-service-client", url ="http://restcountries.eu/rest/v2")
interface SimpleServiceProxy {
#RequestMapping(method = RequestMethod.GET, value = "/name/{country}", produces = "application/json")
public String getCountryInfo(#PathVariable("country") String country);
}
The exception in your question is indicating a timeout via Hystrix when making the request. You can try disabling Hystrix and seeing if it goes away using feign.hystrix.enabled=false.