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I am working on a sample poc and I am trying to integrate the spring cloud api gateway

In my pom.xml I have

<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.7.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.tek</groupId> <artifactId>gatewayApplication</artifactId> <version>0.0.1-SNAPSHOT</version> <name>Gateway Application</name> <description>Gateway Application for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>2021.0.3</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-gateway</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>

and in my application.yml I have

 server: port: 9191 spring: application: name: API-GATEWAY cloud: gateway: routes: - id: DEPARTMENT-SERVICE uri: lb://DEPARTMENT-SERVICE predicates: - Path=/departments/** - id: USER-SERVICE uri: lb://USER-SERVICE predicates: - Path=/user/**

In my main class

@SpringBootApplication @EnableEurekaClient public class GatewayApplication { public static void main(String[] args) { SpringApplication.run(GatewayApplication.class, args); } }

my eureka server

I am able to access the services directly from their respective ports , But when I try to access the api's from port gateway port ie 9191, I get

***2022-09-08 16:23:34.644 ERROR 4128 --- [ctor-http-nio-3] a.w.r.e.AbstractErrorWebExceptionHandler : [7e6c1cec-3] 500 Server Error for HTTP GET "/user/getUserDepartment/1" java.net.UnknownHostException: Failed to resolve 'xxxxxxxx' after 5 queries at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1047) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] 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.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain] __checkpoint ⇢ HTTP GET "/user/getUserDepartment/1" [ExceptionHandlingWebHandler] Original Stack Trace: at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1047) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:1000) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:418) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] at io.netty.resolver.dns.DnsResolveContext.access$600(DnsResolveContext.java:66) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] at io.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:467) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:571) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.resolver.dns.DnsQueryContext.tryFailure(DnsQueryContext.java:256) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] at io.netty.resolver.dns.DnsQueryContext$4.run(DnsQueryContext.java:208) ~[netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:153) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na] Caused by: io.netty.resolver.dns.DnsNameResolverTimeoutException: [/xxxxxxx] query via UDP timed out after 5000 milliseconds (no stack trace available)

* Application.yml file of DepartmentService

server: port: 9001 spring: application: name: DEPARTMENT-SERVICE eureka: client: register-witheureka: true fetch-registry: true service-url: defaultZone: http://localhost:8761/eureka/ instance: hostname: localhost prefer-ip-address: true
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  • Can you specify the routes file where you have specified the URL for DEPARTMENT-SERVICE? Do you have the cloud gateway service on Github to take a look at entire project? Commented Sep 8, 2022 at 16:09
  • Are you asking about the department service controller rest end point @VeeraraghavanN Commented Sep 8, 2022 at 16:22
  • @VeeraraghavanN the routing information is already added in the application.yml of the gatewayserver Commented Sep 8, 2022 at 16:31

1 Answer 1

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I solved it by adding eureka.instance.prefer-ip-address=true and eureka.instance.prefer-ip-address=true in application.properties of all the microservices which are using the gateway service.

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