问题描述

@Feignclient(value=“xx”)不报错
@Feignclient(value=“xx”, fallback=“xx”)
报错

Caused by: java.lang.ClassNotFoundException: feign.hystrix.FallbackFactory$Default
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_301]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[na:1.8.0_301]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355) ~[na:1.8.0_301]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[na:1.8.0_301]
	... 76 common frames omitted

所用版本

<dependencyManagement>
		<dependencies>
			<!--SpringCloudAlibaba-->
			<dependency>
				<groupId>com.alibaba.cloud</groupId>
				<artifactId>spring-cloud-alibaba-dependencies</artifactId>
				<version>2.2.7.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
			<!--SpringCloud-->
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>2021.0.0</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
			<!--SpringBoot-->
			<dependency>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-dependencies</artifactId>
				<version>2.6.7</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

问题根因

依赖缺失feign-hytrix下的hytrix-core

解决方案

加一套依赖

		<dependency>
			<groupId>io.github.openfeign</groupId>
			<artifactId>feign-hystrix</artifactId>
		</dependency>