【已解决】springcloud feign 启动报错Caused by: org.springframework.beans.factory.BeanCreationException: Error

缺乏、安全感 2023-10-02 19:28 15阅读 0赞

### 出错分析 ###

小编在一个微服务项目中，进行feign的远程调用时，由于是`跨服务之间的feign接口调用`，出现了`扫描不到接口的错误`，也就是出错的原因！

写在前面：  
赶时间的小伙伴直接提高扫描的范围即可，在启动类上添加：  
`@ComponentScan(basePackages = "com.pig4cloud.pig.*.*")`

小编给出我们的服务架构图，小伙伴对比看一下是否一样的问题：  
![在这里插入图片描述][b6354169eca54d87899be7e9cd2d4fc7.png]  
**报错信息：**

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.pig4cloud.pig.wms.feign.RemoteProductService': Unexpected exception during bean creation; nested exception is java.lang.IllegalStateException: No fallbackFactory instance of type class com.pig4cloud.pig.wms.feign.factory.RemoteProductServiceFallbackFactory found for feign client remoteProductService
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:537)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300)
    	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887)
    	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791)
    	... 34 common frames omitted
    Caused by: java.lang.IllegalStateException: No fallbackFactory instance of type class com.pig4cloud.pig.wms.feign.factory.RemoteProductServiceFallbackFactory found for feign client remoteProductService
    	at com.pig4cloud.pig.common.feign.ext.PigSentinelFeign$Builder$1.getFromContext(PigSentinelFeign.java:109)
    	at com.pig4cloud.pig.common.feign.ext.PigSentinelFeign$Builder$1.create(PigSentinelFeign.java:99)
    	at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:64)
    	at feign.Feign$Builder.target(Feign.java:269)
    	at org.springframework.cloud.openfeign.DefaultTargeter.target(DefaultTargeter.java:30)
    	at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:330)
    	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:360)
    	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:339)
    	at org.springframework.cloud.openfeign.FeignClientsRegistrar.lambda$registerFeignClient$0(FeignClientsRegistrar.java:230)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1231)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1173)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    	... 43 common frames omitted

根本原因：  
我们可以看到feign的扫描是扫描不到我们另外一个服务的，这时需要我们使用spring的注解`@ComponentScan`来扩大搜索范围。我们需要扩大扫描的范围：`com.pig4cloud.pig.ns`和`com.pig4cloud.pig.wms`，我们可以可以合并一下：`com.pig4cloud.pig.*.*`。第一个`*`为两个服务下的`ns和wms`，我们需要扫描下面的所有包我们直接使用第二个`*`。

![在这里插入图片描述][ac35f39a894a41edbf36b26ba3487ec4.png]

### 解决方案 ###

在启动类上添加：  
`@ComponentScan(basePackages = "com.pig4cloud.pig.*.*")`  
重启完美解决，解决的小伙伴一键三连走起来哈！！

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[b6354169eca54d87899be7e9cd2d4fc7.png]: https://img-blog.csdnimg.cn/b6354169eca54d87899be7e9cd2d4fc7.png
[ac35f39a894a41edbf36b26ba3487ec4.png]: https://img-blog.csdnimg.cn/ac35f39a894a41edbf36b26ba3487ec4.png
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