Spring Cloud Openfeign LoadBalancer: add an ability to supply custom load-balancer into Feign Client

When defining a custom LoadBalancerClient and creating a LoadBalance Bean of type Feign.Builder then its not overriding the DefaultFeignLoadBalancer with our Custom LoadBalancer. It is still looking for Ribbon LoadBalancer. I want to implement Spring Cloud LoadBalancer and that should use in Feign.Builder or normal FeignClient by OpenFeign. The Main reason of doing this, I don't want to use Ribbon Load Balancer while using Feign Client.

@Configuration
@LoadBalancerClient(name = "clientName", configuration = CustomClientConfig.class)
public class CustomLoadBalancerConfig{

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

I have created Feign Interface Manually and has a method which return String type. After that while injecting this feign builder in controller like below, I'm getting issue.

@RestController
public class UserWebController {
       private final Feign.Builder feignBuilder;

       public UserWebController(Feign.Builder feignBuilder) {
        this.feignBuilder = feignBuilder;
    }

    @GetMapping("/greeting")
    public String greet() {
        UserFeignClient userFeignClient = feignBuilder.decoder(new StringDecoder()).target(UserFeignClient.class, "http://clientName");
        return userFeignClient.greeting();
    }

}

When I'm running my application then its started but while calling the endpoint then its throwing exception like below..?

feign.RetryableException: userclient executing GET http://clientName/greeting
    at feign.FeignException.errorExecuting(FeignException.java:249) ~[feign-core-10.7.4.jar:na]
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    |_ checkpoint ? HTTP GET "/greeting" [ExceptionHandlingWebHandler]

Comment From: Nankh

Hi Team Do you think you could add support between Feign and Spring Cloud Load Balancer ?

Since Ribbon is in maintenance mode, we would like to move forward and use SB Load Balancer instead of Ribon https://cloud.spring.io/spring-cloud-netflix/multi/multi__modules_in_maintenance_mode.html

Regards

Comment From: OlgaMaciaszek

The support for SC LoadBalancer features, including retries has now been added. In order to use it inHoxton, set spring.cloud.loadbalancer.ribbon.enabled to false.