Unable to Enable Health Check in Spring Cloud Gateway Client

[nyacham]

Spring Cloud Version : 2020.0.4 Spring Boot version : 2.5.5

Discover Client Properties spring.application.name=load-balancer-client spring.cloud.loadbalancer.ribbon.enabled=false eureka.instance.prefer-ip-address=true server.port=8081 spring.cloud.loadbalancer.health-check.refetch-instances=true spring.cloud.loadbalancer.health-check.refetch-instances-interval=2s

API App Properties spring.application.name=service-api management.endpoints.web.exposure.include=* eureka.instance.prefer-ip-address=true eureka.client.healthcheck.enabled=true My Client Load Balancer Configuration Looks like this

public class LoadBalancerConfiguration {

@Bean
public ServiceInstanceListSupplier instanceSupplier(ConfigurableApplicationContext context) {
    return ServiceInstanceListSupplier.builder()
            .withDiscoveryClient()
            .withHealthChecks()
            .build(context);
}

} This is my Configuration class

@Configuration @LoadBalancerClients(defaultConfiguration = LoadBalancerConfiguration.class) public class WebClientConfiguration {

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


@Bean
WebClient webClient(WebClient.Builder builder) {
    return builder.build();
}

} When I start My Load balancer Client, the rest call fails with the below Error

2021-10-12 11:50:48.962  WARN 21664 --- [        Timer-0] o.s.c.l.core.RoundRobinLoadBalancer      : No servers available for service: service-api
2021-10-12 11:50:48.962  WARN 21664 --- [        Timer-0] eactorLoadBalancerExchangeFilterFunction : LoadBalancer does not contain an instance for the service service-api
2021-10-12 11:50:48.963 ERROR 21664 --- [        Timer-0] reactor.core.publisher.Operators         : Operator called default onErrorDropped

Code For calling API

    ConfiguredWebClientRunner(WebClient http) {
        new Timer().scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                call(http, "http://service-api/hello").subscribe(greeting -> System.out.println("configured: " + greeting));
            }
        }, 0, 2000);

    }

    static Flux<String> call(WebClient http, String url) {
        return http.get().uri(url).retrieve().bodyToFlux(String.class);
    }
}

I alternatively tried by enabling health check by using only using only below spring.cloud.loadbalancer.configurations=health-check and it results in Same Error

This happens only when the health check is enabled an it works fine .withHealthChecks() Uncommented

There is no @Configuration Annotation on the custom config class and I have started the registry server, api server and load balancing client in the right order as well Can someone please let me know what the problem is?

[nyacham]

Stack Overflow Link :https://stackoverflow.com/questions/69545879/enable-health-checks-in-spring-cloud-load-balancer-will-not-work-when-using-cust

[nyacham]

this is related to https://giters.com/spring-cloud/spring-cloud-commons/issues/978?amp=1

[OlgaMaciaszek]

Hello @nyacham , the 2020.0.x release train has not been supported for some time now. Please verify against a supported version, such as Spring Cloud 2021.0.3 and let us know if the issue persists.

[spring-cloud-issues]

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[spring-cloud-issues]

Closing due to lack of requested feedback. If you would like us to look at this issue, please provide the requested information and we will re-open the issue.