Caused by: java.lang.IllegalStateException: PathVariable annotation was empty on param 0.

╰+哭是因爲堅強的太久メ 2023-01-20 14:51 33阅读 0赞

springcloud整合Feign出现错误：

2021-05-13 14:57:35.432 ERROR 9408 --- [           main] o.s.boot.SpringApplication               : Application run failed
    
    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.cloud.feign.UserClientService': Unexpected exception during bean creation; nested exception is java.lang.IllegalStateException: PathVariable annotation was empty on param 0.
    	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:321) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1425) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
    	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:755) [spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
    	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:402) [spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) [spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1247) [spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1236) [spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
    	at com.cloud.SpringBootApplicationMainUserFeign80.main(SpringBootApplicationMainUserFeign80.java:15) [classes/:na]

总结代码没有发现什么错误：最后博主分局错误分析和网上大佬的提示找到了。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hpYW96aHV6aHV5YW5n_size_16_color_FFFFFF_t_70]  
问题原来出现在这地方！！

*  使用Feign接口调用远程服务的方法时，定义各参数绑定，@PathVariable、@RequestParam、@RequestHeader等可以指定参数属性，在Feign中绑定参数必须通过value属性来明确指明具体的参数名，不然会抛出异常。

![在这里插入图片描述][2021051315021635.png]  
**添加value值即可解决！！**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hpYW96aHV6aHV5YW5n_size_16_color_FFFFFF_t_70]: /images/20221021/fb30f977cb4f44dc9ecc8b8bfaeb63c6.png
[2021051315021635.png]: /images/20221021/a42959b9bb5a40b5a15e14c22d3e5e9b.png