fix:fix ClassNotFoundException while not importing openfeign when using circuit-breaker module. (#270)

CHANGELOG.md

@@ -7,3 +7,4 @@
 - [Upgrade: fix third-party lib CVEs & upgrade core spring libs version](https://github.com/Tencent/spring-cloud-tencent/pull/258)
 - [feat:support reading configuration from application.yml or application.properties.](https://github.com/Tencent/spring-cloud-tencent/pull/261)
 - [change the way from escape to encode in 2020.0](https://github.com/Tencent/spring-cloud-tencent/pull/257)
+- [fix:fix ClassNotFoundException while not importing openfeign when using circuit-breaker module.](https://github.com/Tencent/spring-cloud-tencent/pull/270)

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

@@ -25,6 +25,7 @@ import com.tencent.polaris.factory.api.DiscoveryAPIFactory;
 
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.cloud.openfeign.FeignAutoConfiguration;
 import org.springframework.context.annotation.Bean;
@@ -42,6 +43,7 @@ import static org.springframework.core.Ordered.HIGHEST_PRECEDENCE;
 @ConditionalOnProperty(value = "spring.cloud.polaris.circuitbreaker.enabled", havingValue = "true",
 		matchIfMissing = true)
 @Configuration(proxyBeanMethods = false)
+@ConditionalOnClass(name = "org.springframework.cloud.openfeign.FeignAutoConfiguration")
 @AutoConfigureAfter(PolarisContextAutoConfiguration.class)
 @AutoConfigureBefore(FeignAutoConfiguration.class)
 public class PolarisFeignClientAutoConfiguration {