feign---消费者启动报错问题

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原文链接：https://www.cnblogs.com/lxk233/p/11419295.html

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本文详细解析了在Spring Cloud微服务项目中使用Feign时，因回调配置不当导致的异常问题。具体阐述了fallback和fallbackFactory两种配置方式的区别，以及正确的实现方法。

在SpringCloud微服务项目中遇到的问题：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.bwton.tradecenter.tdbd.api.om.interfaces.BizOrderAccpetAPI': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Incompatible fallback instance. Fallback/fallbackFactory of type class com.bwton.tradecenter.tdbd.api.om.interfaces.TdbdOrderFallbackFactory is not assignable to interface com.bwton.tradecenter.tdbd.api.om.interfaces.BizOrderAccpetAPI for feign client tdbd-om-service
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:185)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1640)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1316)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1282)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
    ... 32 common frames omitted
Caused by: java.lang.IllegalStateException: Incompatible fallback instance. Fallback/fallbackFactory of type class com.bwton.tradecenter.tdbd.api.om.interfaces.TdbdOrderFallbackFactory is not assignable to interface com.bwton.tradecenter.tdbd.api.om.interfaces.BizOrderAccpetAPI for feign client tdbd-om-service
    at org.springframework.cloud.netflix.feign.HystrixTargeter.getFromContext(HystrixTargeter.java:100)
    at org.springframework.cloud.netflix.feign.HystrixTargeter.targetWithFallback(HystrixTargeter.java:85)
    at org.springframework.cloud.netflix.feign.HystrixTargeter.target(HystrixTargeter.java:49)
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:145)
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:166)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:178)
    ... 42 common frames omitted

今天使用feign时遇到一个问题消费者启动一直报bean找不到

网上找了一下，大部分都说启动类@SpringBootApplication没有扫描到接口类所在包，但是我按照上面说的依旧没成功。

直到后来发现我的问题错在哪里

错误展示：

接口：

回调：

错误原因：

fallback类型时对应回调应该是实现BizOrderAccpetAPI接口，重写方法

fallbackFactory类型时对应回调应该是实现FallbackFactory<BizOrderAccpetAPI>接口,重写方法

正确配置：

第一种方式：fallback

接口：

回调：

第二种方式：fallbackFactory

接口：

回调：

特此记录

feign重试设置1

feign重试设置2