fix nacos-reactive-discovery-example run failed (#3376)

spring-cloud-alibaba-examples/nacos-example/nacos-discovery-example/nacos-reactivediscovery-consumer-example/src/main/java/com/alibaba/cloud/examples/ConsumerReactiveApplication.java

@@ -18,11 +18,17 @@ package com.alibaba.cloud.examples;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClient;
+import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClients;
 
 /**
  * @author <a href="mailto:fangjian0423@gmail.com">Jim</a>
  */
+
 @SpringBootApplication
+@LoadBalancerClients({
+		@LoadBalancerClient("service-provider")
+})
 public class ConsumerReactiveApplication {
 
 	public static void main(String[] args) {

spring-cloud-alibaba-examples/nacos-example/nacos-discovery-example/nacos-reactivediscovery-consumer-example/src/main/java/com/alibaba/cloud/examples/WebClientConfiguration.java

@@ -18,6 +18,7 @@ package com.alibaba.cloud.examples;
 
 import org.springframework.cloud.client.loadbalancer.LoadBalanced;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.web.reactive.function.client.WebClient;
 
 /**
@@ -25,6 +26,8 @@ import org.springframework.web.reactive.function.client.WebClient;
  *
  * @author fangjian0423, MieAh
  */
+
+@Configuration
 public class WebClientConfiguration {
 
 	@Bean