fix: fix npe when feign.hystrix.enabled=false (#1436)

spring-cloud-starter-tencent-polaris-circuitbreaker/src/test/java/com/tencent/cloud/polaris/circuitbreaker/feign/PolarisCircuitBreakerFeignIntegrationDisableFeignHystrixTest.java

@@ -0,0 +1,56 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.circuitbreaker.feign;
+
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static com.tencent.polaris.test.common.Consts.NAMESPACE_TEST;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
+
+/**
+ * @author Shedfree Wu
+ */
+@ExtendWith(SpringExtension.class)
+@SpringBootTest(webEnvironment = RANDOM_PORT,
+		classes = PolarisCircuitBreakerFeignIntegrationTest.TestConfig.class,
+		properties = {
+		        "feign.hystrix.enabled=false",
+				"spring.cloud.gateway.enabled=false",
+				"feign.circuitbreaker.enabled=true",
+				"spring.cloud.polaris.namespace=" + NAMESPACE_TEST,
+				"spring.cloud.polaris.service=test"
+		})
+public class PolarisCircuitBreakerFeignIntegrationDisableFeignHystrixTest {
+
+	@Autowired
+	private PolarisCircuitBreakerFeignIntegrationTest.EchoService echoService;
+
+	@Test
+	public void testFeignClient() {
+		assertThatThrownBy(() -> {
+			echoService.echo("test");
+		}).isInstanceOf(RuntimeException.class).hasMessageContaining("Load balancer does not have available server for client");
+	}
+}

spring-cloud-starter-tencent-polaris-circuitbreaker/src/test/java/com/tencent/cloud/polaris/circuitbreaker/feign/PolarisCircuitBreakerFeignIntegrationTest.java

@@ -51,6 +51,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.cloud.client.circuitbreaker.CircuitBreakerFactory;
 import org.springframework.cloud.client.circuitbreaker.Customizer;
@@ -79,6 +80,7 @@ import static org.springframework.boot.test.context.SpringBootTest.WebEnvironmen
 @SpringBootTest(webEnvironment = RANDOM_PORT,
 		classes = PolarisCircuitBreakerFeignIntegrationTest.TestConfig.class,
 		properties = {
+				"feign.hystrix.enabled=true",
 				"spring.cloud.gateway.enabled=false",
 				"feign.circuitbreaker.enabled=true",
 				"spring.cloud.polaris.namespace=" + NAMESPACE_TEST,
@@ -244,6 +246,7 @@ public class PolarisCircuitBreakerFeignIntegrationTest {
 		@Bean
 		@Primary
 		@ConditionalOnBean(CircuitBreakerFactory.class)
+		@ConditionalOnProperty(value = "feign.hystrix.enabled", havingValue = "true")
 		public PolarisFeignCircuitBreakerTargeter polarisFeignCircuitBreakerTargeter(CircuitBreakerFactory circuitBreakerFactory, PolarisCircuitBreakerNameResolver circuitBreakerNameResolver) {
 			return new PolarisFeignCircuitBreakerTargeter(circuitBreakerFactory, circuitBreakerNameResolver);
 		}