spring - Issue Microservice routed to Gateway

Question

I've built seperately :

Eureka Server, Spring Cloud Gateway (+ Discovery Client), Spring Web App (+ Discovery Client)

Eureka Server Main Class :

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class ServiceRegistryApplication {

    public static void main(String[] args) {
        SpringApplication.run(ServiceRegistryApplication.class, args);
    }

}

and application.yml

server:
   port: 8761
   
eureka:
   client:
      fetch-registry: false
      register-with-eureka: false

Gateway Main Class :

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class GatewayApplication {

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

}

and application.yml

server:
   port: 8080
   
spring:
   application:
      name: GATEWAY
   cloud:
      gateway:
         routes:
            -id: MICROSERVICE
            uri: lb://MICROSERVICE
            predicates:
                - Path: /service/**

         
eureka:
   client:
      register-with-eureka: true
      fetch-registry: true
      service-url: 
         defualtZone: http://localhost:8761/eureka
   instance: localhost

Microservice Main Class :

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class MicroserviceApplication {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceApplication.class, args);
    }

}

Microservice Controller :

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RequestMapping
@RestController
public class HelloController {

    @GetMapping("/test")
    public String getWelcomed() {
        return "Welcome to Microservice !";
    }
}

and application.yml

server:
   port: 8099

spring:
   application:
      name: MICROSERVICE
   
eureka:
   client:
      register-with-eureka: true
      fetch-registry: true
      service-url: 
         defualtZone: http://localhost:8761/eureka
   instance: localhost

My issue now is that I can't access my microservice '/test' call through the gateway. I keep getting this error :

Whitelabel Error Page This application has no configured error view, so you are seeing this as a fallback.

Wed Dec 23 21:10:14 WEST 2020 [3c6a9e3d-9] There was an unexpected error (type=Not Found, status=404). org.springframework.web.server.ResponseStatusException: 404 NOT_FOUND at org.springframework.web.reactive.resource.ResourceWebHandler.lambda$handle$0(ResourceWebHandler.java:325) Suppressed: reactor.core.publisher.FluxOnAssembly$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 "/service/test" [ExceptionHandlingWebHandler] Stack trace: at org.springframework.web.reactive.resource.ResourceWebHandler.lambda$handle$0(ResourceWebHandler.java:325) at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) at reactor.core.publisher.Mono.subscribe(Mono.java:4252) at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onComplete(FluxSwitchIfEmpty.java:75) at reactor.core.publisher.MonoFlatMap$FlatMapMain.onComplete(MonoFlatMap.java:174) at reactor.core.publisher.MonoNext$NextSubscriber.onComplete(MonoNext.java:96) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:359) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:211) at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:161) at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:86) at reactor.core.publisher.Mono.subscribe(Mono.java:4252) at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:274) at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:851) at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:121) at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2344) at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:162) at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2152) at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:2026) at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:90) at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) at reactor.core.publisher.Mono.subscribe(Mono.java:4252) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:441) at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:211) at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:161) 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:4252) at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) at reactor.netty.http.server.HttpServerHandle.onStateChange(HttpServerHandle.java:65) at reactor.netty.ReactorNetty$CompositeConnectionObserver.onStateChange(ReactorNetty.java:518) at reactor.netty.tcp.TcpServerBind$ChildObserver.onStateChange(TcpServerBind.java:278) at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:475) at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:96) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:191) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.base/java.lang.Thread.run(Thread.java:834)

I've tried hiding the gateway from my eureka server based on some suggestions I've found, yet the issue persists by addind this to my application.yml in gateway :

eureka:
   client:
      register-with-eureka: false
      fetch-registry: false

Answer 1

controller should be

@RestController
@RequestMapping("/service")
public class HelloController

and the URL : http://localhost:8080/service/test

or you can leave @RequestMapping() in the controller and make the gateway using this path :

predicates:
 -Path=/**

then the URL should be: http://localhost:8080/test