Spring FeignClient：解析服務端口時出現NumberFormatException

Question

我正在使用 Netflix Eureka + Netlifx Zuul 並嘗試使用 Feign 客戶端將請求從一個微服務發送到另一個微服務。 我可以通過 zuul 訪問所有微服務，但是，當我嘗試從一個微服務向另一個微服務發出請求時，出現錯誤。

我已經設法弄清楚，它與端口解析有關。 它拋出 NumberFormatException，因為它在制作 url 時無法解析“8084:80”。 如果端口只是 8084，它會工作得很好，因為 8084 是我試圖向其發送請求的服務的端口。

feign.RetryableException: Error at index 4 in: "8084:80" executing POST http://prediction/task
    at feign.FeignException.errorExecuting(FeignException.java:249) ~[feign-core-10.10.1.jar:na]
    at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:129) ~[feign-core-10.10.1.jar:na]
    at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89) ~[feign-core-10.10.1.jar:na]
    at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100) ~[feign-core-10.10.1.jar:na]
    at com.sun.proxy.$Proxy98.runTask(Unknown Source) ~[na:na]
    at lj.uni.fri.scheduler.service.SchedulerService.setCurrentTime(SchedulerService.java:51) ~[classes/:na]
    at jdk.internal.reflect.GeneratedMethodAccessor71.invoke(Unknown Source) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
    at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
    at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) ~[na:na]
    at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
Caused by: java.net.MalformedURLException: Error at index 4 in: "8084:80"
    at java.base/java.net.URL.<init>(URL.java:706) ~[na:na]
    at java.base/java.net.URL.<init>(URL.java:568) ~[na:na]
    at java.base/java.net.URL.<init>(URL.java:515) ~[na:na]
    at feign.Client$Default.convertAndSend(Client.java:148) ~[feign-core-10.10.1.jar:na]
    at feign.Client$Default.execute(Client.java:103) ~[feign-core-10.10.1.jar:na]
    at org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:93) ~[spring-cloud-openfeign-core-2.2.3.BUILD-20200514.112700-81.jar:2.2.3.BUILD-SNAPSHOT]
    at org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:56) ~[spring-cloud-openfeign-core-2.2.3.BUILD-20200514.112700-81.jar:2.2.3.BUILD-SNAPSHOT]
    at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:104) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
    at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:231) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:228) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.drain(OnSubscribeConcatMap.java:286) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.onNext(OnSubscribeConcatMap.java:144) ~[rxjava-1.3.8.jar:1.3.8]
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:185) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
    at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.Subscriber.setProducer(Subscriber.java:209) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.Observable.subscribe(Observable.java:10423) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.Observable.subscribe(Observable.java:10390) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:443) ~[rxjava-1.3.8.jar:1.3.8]
    at rx.observables.BlockingObservable.single(BlockingObservable.java:340) ~[rxjava-1.3.8.jar:1.3.8]
    at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
    at org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:83) ~[spring-cloud-openfeign-core-2.2.3.BUILD-20200514.112700-81.jar:2.2.3.BUILD-SNAPSHOT]
    at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:119) ~[feign-core-10.10.1.jar:na]
    ... 15 common frames omitted
Caused by: java.lang.NumberFormatException: Error at index 4 in: "8084:80"
    at java.base/java.lang.NumberFormatException.forCharSequence(NumberFormatException.java:84) ~[na:na]
    at java.base/java.lang.Integer.parseInt(Integer.java:735) ~[na:na]
    at java.base/java.net.URLStreamHandler.parseURL(URLStreamHandler.java:232) ~[na:na]
    at java.base/java.net.URL.<init>(URL.java:701) ~[na:na]
    ... 57 common frames omitted


Process finished with exit code -1

這是我使用的假客戶端：

package lj.uni.fri.scheduler.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import java.time.LocalDateTime;

@FeignClient(name = "prediction")
public interface PredictionServiceFeign {

    @PostMapping("/task")
    String runTask(@RequestBody LocalDateTime dateTime);

}

這是在端口 8084 上運行的服務的配置：

引導程序.yml

server:
  port: ${PORT:8084}

spring:
  application:
    name: prediction

eureka:
  client:
    serviceUrl:
      defaultZone: ${EUREKA_URL:http://localhost:8761}/eureka/

應用程序.yml

eureka:
  instance:
    non-secure-port: 80
    hostname: ${DOMAIN_NAME:localhost:${server.port}}
  password: ${EUREKA_USER_PASSWORD:password}

security:
  user:
    password: ${eureka.password}

prediction:
  http:
    auth-token-header-name: api-key
    auth-token: ${MICROSERVICE_API_KEY:verysafetoken}

我試過刪除“非安全端口”，但隨后它拋出了“8084：8084”錯誤

如調試器中所見，url 是正確的，但端口除外：

我在用：

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

PS：如果我嘗試將 RestTemplate 與 @LoadBalanced 一起使用，也會發生同樣的錯誤。

Answer 1

我發現我在配置文件中犯了一個錯誤。 我不得不改變：

eureka:
  instance:
    non-secure-port: 80
    hostname: ${DOMAIN_NAME:localhost:${server.port}}

至：

eureka:
  instance:
    non-secure-port: 80
    hostname: ${DOMAIN_NAME:localhost}