[SOLVED] Spring cloud gateway unable to resolve service id from eureka server

Spring cloud gateway unable to resolve service id from eureka server

Followed the spring guides to build the eureka server, spring cloud gateway and a sample rest service.

However, the gateway is unable to retrieve the urls using the service name from the eureka server. The registering of the gateway and service seems to be fine. It works fine when the actual endpoint is provided instead of the service id. I am Unable to understand why the gateway is not resolving the service id from the eureka. Am I missing any configurations ?

Error message:

2018-09-05 23:20:17.751  INFO 47037 --- [ctor-http-nio-2] c.netflix.loadbalancer.BaseLoadBalancer  : Client: localhost instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=localhost,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2018-09-05 23:20:17.756  INFO 47037 --- [ctor-http-nio-2] c.n.l.DynamicServerListLoadBalancer      : Using serverListUpdater PollingServerListUpdater
2018-09-05 23:20:17.760  INFO 47037 --- [ctor-http-nio-2] c.n.l.DynamicServerListLoadBalancer      : DynamicServerListLoadBalancer for client localhost initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=localhost,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@107dc063
2018-09-05 23:20:17.822 ERROR 47037 --- [ctor-http-nio-2] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET http://localhost:8080/rest-service/hello]

org.springframework.cloud.gateway.support.NotFoundException: Unable to find instance for localhost
    at org.springframework.cloud.gateway.filter.LoadBalancerClientFilter.filter(LoadBalancerClientFilter.java:72) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.cloud.gateway.handler.FilteringWebHandler$GatewayFilterAdapter.filter(FilteringWebHandler.java:133) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.cloud.gateway.filter.OrderedGatewayFilter.filter(OrderedGatewayFilter.java:44) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.cloud.gateway.handler.FilteringWebHandler$DefaultGatewayFilterChain.lambda$filter$0(FilteringWebHandler.java:115) ~[spring-cloud-gateway-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:45) ~[reactor-core-3.1.8.RELEASE.jar:3.1.8.RELEASE]

Service Registry:

Attaching the links to the code:

Solution

The issue was with the way spring cloud gateway accesses the service names from eureka, it was case sensitive. The fix was to add the following properties in application.yml

spring.cloud.gateway.discovery.locator.lower-case-service-id= true
spring.cloud.gateway.discovery.locator.enabled= true

I have created a sample project to show all of them working together.