使用SpringCloudStarterGateway和SpringBoot2.4.0及更高版本的未知hostException

6ioyuze2 于 2021-07-13 发布在 Java

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有关https://github.com/reactor/reactor-netty/issues/1431.
spring云网关服务器启动正常，但通过网关的请求失败，出现以下异常：

java.net.UnknownHostException: failed to resolve 'myserver' after 4 queries
at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1013)
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
|_ checkpoint ? org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
|_ checkpoint ? org.springframework.cloud.sleuth.instrument.web.TraceWebFilter [DefaultWebFilterChain]
|_ checkpoint ? org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
|_ checkpoint ? HTTP GET "/service/api/applications/123" [ExceptionHandlingWebHandler]
Stack trace:
at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1013)
at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:966)
at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:414)
at io.netty.resolver.dns.DnsResolveContext.onResponse(DnsResolveContext.java:601)
at io.netty.resolver.dns.DnsResolveContext.access$400(DnsResolveContext.java:63)
at io.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:458)
.....

Works correctly when downgrading spring boot.

spring spring-boot Dns spring-cloud-gateway

来源：https://stackoverflow.com/questions/67075057/unknowhhostexception-using-spring-cloud-starter-gateway-with-spring-boot-2-4-0-a

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按热度按时间

7kqas0il1#

通过添加以下bean定义修复：

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 TempFixConfig {

    @Bean
    public HttpClient webClient() {
        return HttpClient.create().resolver(DefaultAddressResolverGroup.INSTANCE);
    }
}

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使用SpringCloudStarterGateway和SpringBoot2.4.0及更高版本的未知hostException

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