GraalVM 本机映像的运行时错误 DnsServerAddressStreamProviders$DefaultProviderHolder答案

【问题标题】：Runtime error DnsServerAddressStreamProviders$DefaultProviderHolder for GraalVM native imageGraalVM 本机映像的运行时错误 DnsServerAddressStreamProviders$DefaultProviderHolder
【发布时间】：2021-04-21 09:40:41
【问题描述】：

我正在尝试使用 GraalVM 为 Spring Cloud Gateway 构建本机映像。我已经设法构建了一个可以启动的本机映像，但是在第一个 http 请求时我收到了这个错误：

java.lang.NoClassDefFoundError: Could not initialize class io.netty.resolver.dns.DnsServerAddressStreamProviders$DefaultProviderHolder
        at com.oracle.svm.core.classinitialization.ClassInitializationInfo.initialize(ClassInitializationInfo.java:239) ~[na:na]
        at io.netty.resolver.dns.DnsServerAddressStreamProviders.unixDefault(DnsServerAddressStreamProviders.java:107) ~[gatewayapplication.exe:4.1.60.Final]
        at io.netty.resolver.dns.DnsServerAddressStreamProviders.platformDefault(DnsServerAddressStreamProviders.java:103) ~[gatewayapplication.exe:4.1.60.Final]
        at io.netty.resolver.dns.DnsNameResolverBuilder.<init>(DnsNameResolverBuilder.java:60) ~[na:na]
        at reactor.netty.transport.NameResolverProvider.newNameResolverGroup(NameResolverProvider.java:405) ~[na:na]
        at reactor.netty.tcp.TcpResources.getOrCreateDefaultResolver(TcpResources.java:306) ~[na:na]
        at reactor.netty.http.HttpResources.getOrCreateDefaultResolver(HttpResources.java:140) ~[na:na]
        at reactor.netty.http.client.HttpClientConfig.defaultAddressResolverGroup(HttpClientConfig.java:380) ~[na:na]
        at reactor.netty.transport.ClientTransportConfig.resolverInternal(ClientTransportConfig.java:219) ~[na:na]
        at reactor.netty.http.client.HttpClientConfig.resolverInternal(HttpClientConfig.java:434) ~[na:na]
        at reactor.netty.http.client.HttpClientConnect$MonoHttpConnect.lambda$subscribe$0(HttpClientConnect.java:264) ~[na:na]
        at reactor.core.publisher.MonoCreate.subscribe(MonoCreate.java:57) ~[na:na]
        at reactor.core.publisher.FluxRetryWhen.subscribe(FluxRetryWhen.java:76) ~[na:na]
        at reactor.core.publisher.MonoRetryWhen.subscribeOrReturn(MonoRetryWhen.java:46) ~[na:na]
        at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:57) ~[na:na]
        at reactor.netty.http.client.HttpClientConnect$MonoHttpConnect.subscribe(HttpClientConnect.java:271) ~[na:na]

添加这个标志，没有帮助

--initialize-at-run-time=io.netty.resolver.dns.DnsServerAddressStreamProviders$DefaultProviderHolder

在反射配置中添加一个条目，两者都没有

{
  "name":"io.netty.resolver.dns.DnsServerAddressStreamProviders$DefaultProviderHolder"
}

项目可以在这里找到：https://github.com/hanouard/demo-native-gateway

您知道导致此错误的原因吗？

【问题讨论】：

标签： spring-cloud-gateway graalvm-native-image spring-native

【解决方案1】：

在将 Spring Boot 从 2.4.3 升级到 2.4.4 后，我遇到了同样的问题，我的错误如下所示：

java.lang.AbstractMethodError: Receiver class reactor.netty.http.client.HttpClientConfig does not define or inherit an implementation of the resolved method 'abstract io.netty.resolver.AddressResolverGroup defaultAddressResolverGroup()' of abstract class reactor.netty.transport.ClientTransportConfig.
    at reactor.netty.transport.ClientTransportConfig.resolverInternal(ClientTransportConfig.java:219)
    at reactor.netty.http.client.HttpClientConfig.resolverInternal(HttpClientConfig.java:420)
    at reactor.netty.http.client.HttpClientConnect$MonoHttpConnect.lambda$subscribe$0(HttpClientConnect.java:262)
    at reactor.core.publisher.MonoCreate.subscribe(MonoCreate.java:57)
    at reactor.core.publisher.FluxRetryWhen.subscribe(FluxRetryWhen.java:76)
    at reactor.core.publisher.MonoRetryWhen.subscribeOrReturn(MonoRetryWhen.java:46)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:57)
    at reactor.netty.http.client.HttpClientConnect$MonoHttpConnect.subscribe(HttpClientConnect.java:269)
    at reactor.core.publisher.Flux.subscribe(Flux.java:8227)
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:255)
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:255)
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:255)
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51)
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:157)
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:73)
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82)
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:281)
    at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:860)
    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:120)
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:73)
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1815)
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:151)
    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:120)
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82)
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:281)
    at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:860)
    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
    at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:180)
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1815)
    at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onNext(MonoFilterWhen.java:149)
    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2397)
    at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onSubscribe(MonoFilterWhen.java:112)
    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:448)
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onNext(FluxConcatMap.java:250)
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:98)
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:44)
    at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:270)
    at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:228)
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.request(FluxDematerialize.java:127)
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:235)
    at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onSubscribe(FluxDematerialize.java:77)
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:164)
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:86)
    at reactor.core.publisher.InternalFluxOperator.subscribe(InternalFluxOperator.java:62)
    at reactor.core.publisher.FluxDefer.subscribe(FluxDefer.java:54)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:448)
    at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:218)
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:164)
    at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:86)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:255)
    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.Mono.subscribeWith(Mono.java:4265)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4121)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4057)
    at org.springframework.test.web.reactive.server.HttpHandlerConnector.lambda$doConnect$2(HttpHandlerConnector.java:98)
    at org.springframework.mock.http.client.reactive.MockClientHttpRequest.lambda$null$2(MockClientHttpRequest.java:125)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.FluxConcatIterable$ConcatIterableSubscriber.onComplete(FluxConcatIterable.java:147)
    at reactor.core.publisher.FluxConcatIterable.subscribe(FluxConcatIterable.java:60)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.Mono.subscribeWith(Mono.java:4265)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4121)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4057)
    at org.springframework.test.web.reactive.server.HttpHandlerConnector.doConnect(HttpHandlerConnector.java:112)
    at org.springframework.test.web.reactive.server.HttpHandlerConnector.lambda$connect$0(HttpHandlerConnector.java:79)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
    at reactor.core.publisher.MonoSubscribeOn$SubscribeOnSubscriber.run(MonoSubscribeOn.java:126)
    at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:84)
    at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:37)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:829)

我可以通过添加以下 bean 来修复它：

import org.springframework.cloud.gateway.config.HttpClientCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import io.netty.resolver.DefaultAddressResolverGroup;
import reactor.netty.http.client.HttpClient;

@Configuration
public class HttpClientResolverFixConfig {

    @Bean
    public HttpClientCustomizer httpClientResolverCustomizer() {
        return new HttpClientCustomizer() {

            @Override
            public HttpClient customize(HttpClient httpClient) {
                return httpClient.resolver(DefaultAddressResolverGroup.INSTANCE);
            }
        };
    }

}

点击此处了解更多详情：https://github.com/reactor/reactor-netty/issues/1431

【讨论】：

你遇到的错误与 GraalVM 和原生镜像无关。

【解决方案2】：

实际上，我试图实现的目标尚未得到 Spring Native 的支持： https://docs.spring.io/spring-native/docs/current/reference/htmlsingle/#support-spring-cloud

我猜他们更新了他们的文档，因为我在 0.9.1 中看到了对 Spring Cloud Gateway 的支持。

【讨论】：