项目中使用feign报错

Question

java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.openfeign.ribbon.FeignRibbonClientAutoConfiguration] from ClassLoader [java.net.URLClassLoader@24a67499]

at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:659) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:556) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:541) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:599) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:728) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:670) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:638) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1507) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:421) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:391) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:97) ~[spring-context-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:693) ~[spring-context-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.0.0.RC3.jar:5.0.0.RC3]

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:122) ~[spring-boot-2.0.0.M3.jar:2.0.0.M3]

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.0.0.M3.jar:2.0.0.M3]

at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:386) [spring-boot-2.0.0.M3.jar:2.0.0.M3]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.M3.jar:2.0.0.M3]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1245) [spring-boot-2.0.0.M3.jar:2.0.0.M3]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1233) [spring-boot-2.0.0.M3.jar:2.0.0.M3]

at com.imooc.order.OrderApplication.main(OrderApplication.java:14) [classes/:na]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_60]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_60]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_60]

at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_60]

at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:496) [spring-boot-maven-plugin-2.0.0.M3.jar:2.0.0.M3]

at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]

Caused by: java.lang.NoClassDefFoundError: org/springframework/cloud/client/loadbalancer/LoadBalancedRetryFactory

at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_60]

at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_60]

at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_60]

at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:641) ~[spring-core-5.0.0.RC3.jar:5.0.0.RC3]

... 25 common frames omitted

Caused by: java.lang.ClassNotFoundException: org.springframework.cloud.client.loadbalancer.LoadBalancedRetryFactory

at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_60]

at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_60]

at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_60]

... 29 common frames omitted

Answer 1

廖师兄 2019-03-17 22:53:50

Caused by: java.lang.ClassNotFoundException: org.springframework.cloud.client.loadbalancer.LoadBalancedRetryFactory

新版的feign改名了，查看课程源码doc/QA.md

• 提问者 sxfmky #1

  改了版本还是报那个错误

• 提问者 sxfmky #2

  改了版本还是报那个错误

• 廖师兄 回复 提问者 sxfmky #3

  把你的代码push到git，我这边运行看看。

Answer 2

慕斯3919650 2019-03-18 16:29:26

这个问题我当时也遇到了，是因为feign的版本问题，因为开始用的spring boot和spring cloud版本比较旧，所以自动导入的版本不匹配，引入feign依赖时加上版本就好了：

<!--因为springboot和springcloud使用的版本比较旧,所以需要指定feign的版本,否则自动引入版本不匹配导致启动报错-->
<dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-feign</artifactId>
     <version>2.0.0.M1</version>
</dependency>