fix:fix circuitbreaker wrapper init error.

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/feign/PolarisFeignBeanPostProcessor.java

@@ -27,6 +27,7 @@ import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.cloud.client.loadbalancer.LoadBalancerProperties;
 import org.springframework.cloud.loadbalancer.blocking.client.BlockingLoadBalancerClient;
 import org.springframework.cloud.loadbalancer.support.LoadBalancerClientFactory;
+import org.springframework.cloud.openfeign.loadbalancer.FeignBlockingLoadBalancerClient;
 import org.springframework.cloud.openfeign.loadbalancer.RetryableFeignBlockingLoadBalancerClient;
 
 /**
@@ -51,13 +52,21 @@ public class PolarisFeignBeanPostProcessor implements BeanPostProcessor, BeanFac
 
 	private Object wrapper(Object bean) {
 		if (isNeedWrap(bean)) {
+			if (bean instanceof RetryableFeignBlockingLoadBalancerClient || bean instanceof FeignBlockingLoadBalancerClient) {
+				Client delegate;
 				if (bean instanceof RetryableFeignBlockingLoadBalancerClient) {
-				RetryableFeignBlockingLoadBalancerClient client = (RetryableFeignBlockingLoadBalancerClient) bean;
-				return new PolarisFeignBlockingLoadBalancerClient(createPolarisFeignClient(client.getDelegate()),
+					delegate = ((RetryableFeignBlockingLoadBalancerClient) bean).getDelegate();
+				}
+				else {
+					delegate = ((FeignBlockingLoadBalancerClient) bean).getDelegate();
+				}
+				if (delegate != null) {
+					return new PolarisFeignBlockingLoadBalancerClient(createPolarisFeignClient(delegate),
 							factory.getBean(BlockingLoadBalancerClient.class),
 							factory.getBean(LoadBalancerProperties.class),
 							factory.getBean(LoadBalancerClientFactory.class));
 				}
+			}
 			return createPolarisFeignClient((Client) bean);
 		}
 		return bean;