CODEWITHSUNDEEP
javaspring-bootspring-cloudspring-cloud-feignspring-cloud-loadbalancer
ExaSephiroth
ExaSephiroth

Reputation: 165

Spring cloud loadbalancer - Feign + SimpleDiscoveryClient with healthcheck/retry

I'm struggling to switch from Ribbon to Spring Cloud Loadbalancer after upgrading spring cloud versions. Setting up the SimpleDiscoveryClient with Feign was easy. But the simplediscovery client is 'too simple'. I want to add at least a healthcheck so it doesn't use an instance that is potentially down & preferably also a retry mechanism. I've read the docs over & over but cannot find an easy way to set this up.

https://docs.spring.io/spring-cloud-commons/docs/current/reference/html/#instance-health-check-for-loadbalancer I found this example custom config for the health check, but it doesn't work.

public class CustomLoadBalancerConfiguration {

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

if I run it as is, it throws the following missing bean error: Method discoveryClientServiceInstanceListSupplier in XXX.CustomLoadBalancerConfig required a bean of type 'org.springframework.web.client.RestTemplate' that could not be found.

Can anyone give me some pointers on how to get this working or how I can replicate the ribbon behavior?

Upvotes: 4

Views: 1450

Answers (2)

Archimedes Trajano
Archimedes Trajano

Reputation: 41580

Try adding the following to your application class

@LoadBalancerClients(defaultConfiguration = LoadBalancerClientConfiguration.class)
public class GatewayApplication {

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

This will enable the creation of DiscoveryClientServiceInstanceListSupplier (note the class itself is not available in the context, so you can't just autowire it for testing).

Upvotes: 0

broken98
broken98

Reputation: 43

Add the below RestTemplate Bean in your configuration.

@Bean
public RestTemplate restTemplate() {
    return new RestTemplate();
}

Upvotes: 0

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