Spring Boot java.net.UnknownHostException:6次查询后无法解析“inventory-service”[A(1)，AAAA(28)]

qyzbxkaa  于 2023-10-16  发布在  Spring
关注(0)|答案(2)|浏览(107)

我使用Java 17、Sping Boot v3.1.3和Spring Cloud堆栈来执行服务间通信。
当我向http：//localhost：8081/api/order发出POST请求时收到此错误
订单服务错误：

java.net.UnknownHostException: Failed to resolve 'inventory-service' [A(1), AAAA(28)] after 6 queries 
    at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1097) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:1044) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:432) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsResolveContext.onResponse(DnsResolveContext.java:662) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsResolveContext.access$500(DnsResolveContext.java:66) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:489) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:590) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:583) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:559) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:492) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:636) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:625) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:105) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsQueryContext.trySuccess(DnsQueryContext.java:317) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsQueryContext.finishSuccess(DnsQueryContext.java:309) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.resolver.dns.DnsNameResolver$DnsResponseHandler.channelRead(DnsNameResolver.java:1392) ~[netty-resolver-dns-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:97) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
    at java.base/java.lang.Thread.run(Thread.java:1589) ~[na:na]

pom.xml

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>4.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
            <version>3.1.6</version>
        </dependency>

WebClientConfig类：

@Configuration
public class WebClientConfig {

    @Bean
    @LoadBalanced
    public WebClient.Builder webClientBuilder() {
        return WebClient.builder();
    }
}

OrderService类：

private final WebClient.Builder webClientBuilder;

    public void placeOrder(OrderRequest orderRequest) {
        Order order = new Order();
        order.setOrderNumber(UUID.randomUUID().toString());

        List<OrderLineItems> orderLineItems = orderRequest.getOrderLineItemsDto()
                .stream()
                .map(this::mapToDto)
                .toList();
        order.setOrderLineItems(orderLineItems);

        List<String> skuCodes = order.getOrderLineItems().stream()
                .map(OrderLineItems::getSkuCode)
                .toList();

        InventoryResponse[] inventoryResponses = webClientBuilder.build().get()
                .uri("http://inventory-service/api/inventory",
                        uriBuilder -> uriBuilder.queryParam("skuCode", skuCodes).build())
                .retrieve()
                .bodyToMono(InventoryResponse[].class)
                .block();

application.properties:

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/order-service
spring.datasource.username=username
spring.datasource.password=password
spring.jpa.hibernate.ddl-auto=update
spring.application.name=order-service

server.port=8081

eureka.client.service-url.default-zone=http://localhost:8761/eureka
eureka.instance.prefer-ip-address=true
eureka.instance.hostname=localhost

application.properties从inventory-service：

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3307/inventory-service
spring.datasource.username=root
spring.datasource.password=1234
spring.jpa.hibernate.ddl-auto=create-drop
spring.application.name=inventory-service

server.port=0

eureka.client.service-url.default-zone=http://localhost:8761/eureka

application.properties从discovery-server：

server.port=8761

eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone=http://localhost:${server.port}/eureka/
eureka.instance.prefer-ip-address=true

我真的不知道我做错了什么。

spring-boot

2条答案

按热度按时间
zzzyeukh

zzzyeukh1#

您的错误是因为您的DNS没有将inventory-service解析为任何IPv4/6。
我不知道这个服务是什么，但它是从你的OrderService调用/配置的：

InventoryResponse[] inventoryResponses = webClientBuilder.build().get()
                .uri("http://inventory-service/api/inventory",
                        uriBuilder -> uriBuilder.queryParam("skuCode", skuCodes).build())
                .retrieve()
                .bodyToMono(InventoryResponse[].class)
                .block();

你必须适当地改变它：从您的配置中，我们可以看到您使用了来自类似命名服务的本地数据库：

spring.datasource.url=jdbc:mysql://localhost:3307/inventory-service

如果两个服务都在同一台机器上启动，那么你可能需要将http://inventory-service更改为http://localhost:?/：

  • 我使用?是因为您的库存服务application.properties使用server.port=0;
  • 我不知道Sping Boot ，但在大多数情况下，这将使用随机端口。

您可以尝试修复一个端口并在OrderService中使用它。
但是，您的discovery-server可能意味着您的每个服务都使用它来“发现”实际的端点。
对于这一点，我不能帮助，因为我不知道Eureka （我想这是发现服务的名称正在配置的属性）。

赞(0）分享  回复(0）举报  2023-10-16
mspsb9vt

mspsb9vt2#

尝试用途：

@Autowired
private WebClient.Builder webClientBuilder;

而不是：

private WebClient.Builder webClientBuilder;
赞(0）分享  回复(0）举报  2023-10-16
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