Add public delegate modifiers in order to avoid reflection in SC Sleuth.

spring-cloud-openfeign-core/src/main/java/org/springframework/cloud/openfeign/loadbalancer/FeignBlockingLoadBalancerClient.java

@@ -41,14 +41,14 @@ import org.springframework.util.Assert;
 public class FeignBlockingLoadBalancerClient implements Client {
 
 	private static final Log LOG = LogFactory
-		.getLog(FeignBlockingLoadBalancerClient.class);
-
-	private final Client delegate;
+			.getLog(FeignBlockingLoadBalancerClient.class);
 
 	private final BlockingLoadBalancerClient loadBalancerClient;
 
+	private Client delegate;
+
 	public FeignBlockingLoadBalancerClient(Client delegate,
-		BlockingLoadBalancerClient loadBalancerClient) {
+			BlockingLoadBalancerClient loadBalancerClient) {
 		this.delegate = delegate;
 		this.loadBalancerClient = loadBalancerClient;
 	}
@@ -58,7 +58,7 @@ public class FeignBlockingLoadBalancerClient implements Client {
 		final URI originalUri = URI.create(request.url());
 		String serviceId = originalUri.getHost();
 		Assert.state(serviceId != null,
-			"Request URI does not contain a valid hostname: " + originalUri);
+				"Request URI does not contain a valid hostname: " + originalUri);
 		ServiceInstance instance = loadBalancerClient.choose(serviceId);
 		if (instance == null) {
 			String message = "Load balancer does not contain an instance for the service "
@@ -78,8 +78,14 @@ public class FeignBlockingLoadBalancerClient implements Client {
 		return delegate.execute(newRequest, options);
 	}
 
+	// Visible for Sleuth instrumentation
 	public Client getDelegate() {
 		return delegate;
 	}
 
+	// Visible for Sleuth instrumentation
+	public void setDelegate(Client delegate) {
+		this.delegate = delegate;
+	}
+
 }

spring-cloud-openfeign-core/src/main/java/org/springframework/cloud/openfeign/ribbon/LoadBalancerFeignClient.java

@@ -37,7 +37,7 @@ public class LoadBalancerFeignClient implements Client {
 
 	static final Request.Options DEFAULT_OPTIONS = new Request.Options();
 
-	private final Client delegate;
+	private Client delegate;
 
 	private CachingSpringLoadBalancerFactory lbClientFactory;
 
@@ -116,6 +116,11 @@ public class LoadBalancerFeignClient implements Client {
 		return this.delegate;
 	}
 
+	// Visible for Sleuth instrumentation
+	public void setDelegate(Client delegate) {
+		this.delegate = delegate;
+	}
+
 	private FeignLoadBalancer lbClient(String clientName) {
 		return this.lbClientFactory.create(clientName);
 	}