L'équilibreur de charge n'a pas de serveur disponible pour le client
J'essaie d'utiliser le client Feign. Ci-dessous, mon client feing:
import com.eprogrammerz.examples.domain.Movie;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
/**
* Created by Yogen on 12/26/2016.
*/
@FeignClient(name = "movie-api")
public interface MovieApi {
@RequestMapping(method = RequestMethod.GET, value = "/movies/{id}")
Movie getMovie(@PathVariable("id") Long id);
}
Je l'appelle du service simple comme ci-dessous:
@Service
public class MovieService {
@Autowired
MovieApi movieApi;
public Movie findMovie(Long id){
Movie movieOfTheDay = movieApi.getMovie(id);
return movieOfTheDay;
}
}
Mon application de démarrage de printemps est comme ci-dessous:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
@EnableFeignClients(basePackages = {"com.eprogrammerz.examples"})
@EnableCircuitBreaker
@SpringBootApplication
public class ClientAppApplication {
public static void main(String[] args) {
SpringApplication.run(ClientAppApplication.class, args);
}
}
build.gradle
buildscript {
ext {
springBootVersion = '1.4.3.RELEASE'
}
repositories {
jcenter()
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'Java'
apply plugin: 'Eclipse'
apply plugin: 'org.springframework.boot'
jar {
baseName = 'client-app'
version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
jcenter()
mavenCentral()
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
}
dependencies {
compile('org.springframework.cloud:spring-cloud-starter-feign')
// https://mvnrepository.com/artifact/com.netflix.hystrix/hystrix-core
compile('org.springframework.cloud:spring-cloud-starter-hystrix')
compile("org.springframework.boot:spring-boot-starter-web"){
exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
}
compileOnly('org.projectlombok:lombok')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-dependencies:Camden.BUILD-SNAPSHOT"
mavenBom "org.springframework.boot:spring-boot-starter-parent:${springBootVersion}"
}
}
Je reçois une erreur comme ci-dessous:
2016-12-30 13:07:16.894 INFO 6748 --- [nio-8082-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 39 ms
2016-12-30 13:07:16.939 INFO 6748 --- [nio-8082-exec-1] c.e.e.controllers.RequestController : Calling findMovie(1203)
2016-12-30 13:07:17.240 INFO 6748 --- [rix-movie-api-1] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@547496c2: startup date [Fri Dec 30 13:07:17 EST 2016]; parent: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@542e560f
2016-12-30 13:07:17.318 INFO 6748 --- [rix-movie-api-1] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2016-12-30 13:07:17.619 INFO 6748 --- [rix-movie-api-1] c.netflix.config.ChainedDynamicProperty : Flipping property: movie-api.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2016-12-30 13:07:17.670 INFO 6748 --- [rix-movie-api-1] c.n.u.concurrent.ShutdownEnabledTimer : Shutdown hook installed for: NFLoadBalancer-PingTimer-movie-api
2016-12-30 13:07:17.727 INFO 6748 --- [rix-movie-api-1] c.netflix.loadbalancer.BaseLoadBalancer : Client:movie-api instantiated a LoadBalancer:DynamicServerListLoadBalancer:{NFLoadBalancer:name=movie-api,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2016-12-30 13:07:17.739 INFO 6748 --- [rix-movie-api-1] c.n.l.DynamicServerListLoadBalancer : Using serverListUpdater PollingServerListUpdater
2016-12-30 13:07:17.746 INFO 6748 --- [rix-movie-api-1] c.n.l.DynamicServerListLoadBalancer : DynamicServerListLoadBalancer for client movie-api initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=movie-api,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:com.netflix.loadbalancer.ConfigurationBasedServerList@45bcfd5
2016-12-30 13:07:18.191 ERROR 6748 --- [nio-8082-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.netflix.hystrix.exception.HystrixRuntimeException: MovieApi#getMovie(Long) failed and no fallback available.] with root cause
com.netflix.client.ClientException: Load balancer does not have available server for client: movie-api
at com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.Java:468) ~[ribbon-loadbalancer-2.2.0.jar:2.2.0]
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.Java:184) ~[ribbon-loadbalancer-2.2.0.jar:2.2.0]
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.Java:180) ~[ribbon-loadbalancer-2.2.0.jar:2.2.0]
at rx.Observable.unsafeSubscribe(Observable.Java:10211) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.Java:94) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.Java:42) ~[rxjava-1.1.10.jar:1.1.10]
at rx.Observable.unsafeSubscribe(Observable.Java:10211) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.Java:127) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.Java:73) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.Java:52) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.Java:79) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.Java:45) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.Java:276) ~[rxjava-1.1.10.jar:1.1.10]
at rx.Subscriber.setProducer(Subscriber.Java:209) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.Java:138) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.Java:129) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:48) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:48) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:48) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.Observable.subscribe(Observable.Java:10307) ~[rxjava-1.1.10.jar:1.1.10]
at rx.Observable.subscribe(Observable.Java:10274) ~[rxjava-1.1.10.jar:1.1.10]
at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.Java:445) ~[rxjava-1.1.10.jar:1.1.10]
at rx.observables.BlockingObservable.single(BlockingObservable.Java:342) ~[rxjava-1.1.10.jar:1.1.10]
at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.Java:102) ~[ribbon-loadbalancer-2.2.0.jar:2.2.0]
at org.springframework.cloud.netflix.feign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.Java:63) ~[spring-cloud-netflix-core-1.2.4.BUILD-SNAPSHOT.jar:1.2.4.BUILD-SNAPSHOT]
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.Java:97) ~[feign-core-9.3.1.jar:na]
at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.Java:76) ~[feign-core-9.3.1.jar:na]
at feign.hystrix.HystrixInvocationHandler$1.run(HystrixInvocationHandler.Java:108) ~[feign-hystrix-9.3.1.jar:na]
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.Java:301) ~[hystrix-core-1.5.6.jar:1.5.6]
at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.Java:297) ~[hystrix-core-1.5.6.jar:1.5.6]
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.Java:46) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.Java:35) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:48) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:48) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:48) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.Observable.unsafeSubscribe(Observable.Java:10211) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.Java:51) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.Java:35) ~[rxjava-1.1.10.jar:1.1.10]
at rx.Observable.unsafeSubscribe(Observable.Java:10211) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.Java:41) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:48) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.Java:30) ~[rxjava-1.1.10.jar:1.1.10]
at rx.Observable.unsafeSubscribe(Observable.Java:10211) ~[rxjava-1.1.10.jar:1.1.10]
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.Java:94) ~[rxjava-1.1.10.jar:1.1.10]
at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.Java:56) ~[hystrix-core-1.5.6.jar:1.5.6]
at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.Java:47) ~[hystrix-core-1.5.6.jar:1.5.6]
at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction.call(HystrixContexSchedulerAction.Java:69) ~[hystrix-core-1.5.6.jar:1.5.6]
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.Java:55) ~[rxjava-1.1.10.jar:1.1.10]
at Java.util.concurrent.Executors$RunnableAdapter.call(Executors.Java:511) ~[na:1.8.0_51]
at Java.util.concurrent.FutureTask.run(FutureTask.Java:266) ~[na:1.8.0_51]
at Java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.Java:1142) ~[na:1.8.0_51]
at Java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.Java:617) ~[na:1.8.0_51]
at Java.lang.Thread.run(Thread.Java:745) [na:1.8.0_51]
J'ai essayé de manière différente. Mais n'arrivait pas à trouver la solution. Je n'ai trouvé aucune information à ce sujet sur Spring Cloud Netflix aussi. Je n'ai trouvé aucune information sur le fil de discussion sur StackOverflow aussi.
Qu'est-ce qui me manque ici? TIA.
Plus de détails:
application.yml pour le microservice movie-api est comme ci-dessous:
server:
port: 8090
logging:
config: classpath:log4j2.yml
spring:
application:
name: movie-api
Application de démarrage de printemps sur le module movie-api:
@SpringBootApplication
public class MovieApiApplication {
public static void main(String[] args) {
SpringApplication.run(MovieApiApplication.class, args);
}
}
Et contrôleur est comme ci-dessous:
@RestController
@Slf4j
public class MovieController {
@Autowired
private MovieRepository movieRepository;
@RequestMapping("/movies/{id}")
public ResponseEntity<Movie> getBook(@PathVariable("id") Long id){
log.trace("getBook({})",id);
Optional<Movie> movie = Optional.of(movieRepository.findOneById(id));
if(movie.isPresent())
return new ResponseEntity(movie.get(), HttpStatus.OK);
return new ResponseEntity<Movie>(HttpStatus.NOT_FOUND);
}
}
Après des recherches et avec l'aide de Bloodysock, j'ai constaté qu'il me manquait l'enregistrement du serveur distant dans le micro-service 'client-app'. Le document est à Spring Cloud Netflix .
J'ai utilisé Ribbon sans Eureka avec la configuration dans application.yml dans le micro-service 'client-app' en tant que:
movie-api:
ribbon:
listOfServers: http://localhost:8090
Le problème est que votre service ne connaît pas l'hôte du service demandé. Si vous utilisez Eureka, placez cette ligne sur votre fichier .properties ou .yml:
eureka.client.fetchRegistry = true
OR
eureka: client: fetchRegistry: true
Il fera parler votre service avec Eureka et découvrira l’hôte du service demandé.
Si vous avez configuré Spring =, ne prend pas en charge la spécification des serveurs dans application.properties /application.yml, vous devez configurer l'URL des services dans une classe de configuration.
Veuillez noter que message d'avertissement dans mon application.properties [Spring Boot v2.0.0RELEASE, printemps-cloud-starter-feign & printemps-cloud-starter-ribbon v 1.4.3.RELEASE ]
Donc ce que j'ai fait était d'écrire une classe de configuration comme suit:
@Configuration
class LocalRibbonClientConfiguration {
@Bean
public ServerList<Server> ribbonServerList() {
// return new ConfigurationBasedServerList();
StaticServerList<Server> staticServerList = new StaticServerList<>((new Server("localhost", 8001)),
new Server("localhost", 8000));
return staticServerList;
}
}
Ensuite, configurez l’application Spring Boot pour utiliser cette configuration comme suit:
@SpringBootApplication
@EnableFeignClients("my-package.currencyconversionservice")
@RibbonClient(name = "currency-conversion-service", configuration = LocalRibbonClientConfiguration.class)
public class CurrencyConversionServiceApplication {
// nothing new here...
}
Pas besoin de changer la classe du proxy Feign. Publier juste pour que ce message soit servi comme solution complète au problème:
@FeignClient(name="currency-exchange-service")
@RibbonClient(name="currency-exchange-service")
public interface CurrencyExchangeServiceProxy {
@GetMapping("/currency-exchange/from/{from}/to/{to}")
public CurrencyConversionBean retrieveExchangeValue(@PathVariable("from") String from, @PathVariable("to") String to);
}
C'est tout. Le problème a été résolu.