Springboot?FeignClient調用報錯怎么解決

這篇文章主要講解了“Springboot FeignClient調用報錯怎么解決”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“Springboot FeignClient調用報錯怎么解決”吧！

背景：在做多服務之間需要使用FeignClient進行服務調用的時候，出現PathVariable annotation was empty on param 0.，根據提示需要指定value的值，以下為具體解決過程

/**
 * @Package: com.aimsphm.nuclear.data.feign
 * @Description: <服務調用>
 * @Author: MILLA
 * @CreateDate: 2020/3/31 15:22
 * @UpdateUser: MILLA
 * @UpdateDate: 2020/3/31 15:22
 * @UpdateRemark: <>
 * @Version: 1.0
 */
@Component
@FeignClient(value = "nuclear-core", fallback = CoreHystrixClientFallback.class)
public interface CoreServiceFeignClient {
 
    @GetMapping("{deviceId}/statistics/warning")
    ReturnResponse statisticsWarmingPoints(@PathVariable Long deviceId, Long startTime, Long endTime);
}

啟動后報錯代碼為：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportApplication': Unsatisfied dependency expressed through field 'reportUtils'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportUtils': Unsatisfied dependency expressed through field 'service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportDataOperationServiceImpl': Unsatisfied dependency expressed through field 'coreFeignClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.aimsphm.nuclear.report.feign.CoreServiceFeignClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException:
PathVariable annotation was empty on param 0.
 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:598) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1404) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]

第二行實際為重點語句：描述為PathVariable注解作為第一個參數不能為空

改動為：

@GetMapping("{deviceId}/statistics/warning")
ReturnResponse statisticsWarmingPoints(@PathVariable(value = "deviceId") Long deviceId, Long startTime, Long endTime)

重新啟動后：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportApplication': Unsatisfied dependency expressed through field 'reportUtils'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportUtils': Unsatisfied dependency expressed through field 'service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportDataOperationServiceImpl': Unsatisfied dependency expressed through field 'coreFeignClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.aimsphm.nuclear.report.feign.CoreServiceFeignClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException:
 Method has too many Body parameters: public abstract com.aimsphm.nuclear.common.response.ReturnResponse com.aimsphm.nuclear.report.feign.CoreServiceFeignClient.statisticsWarmingPoints(java.lang.Long,java.lang.Long,java.lang.Long)
 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:598) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1404) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:847) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.13.RELEASE.jar:5.1.13.RELEASE]
 at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
 at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744) [spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
 at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391) [spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
 at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) [spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204) [spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
 at com.aimsphm.nuclear.report.ReportApplication.main(ReportApplication.java:28) [classes/:na]

依然是第二行描述為：在body中的參數有太多了，所以此時，首先確定參數是否是在body中，如果是的話，應該合成一個參數進行傳遞，如果不是的話，看是否應該是采用@RequestParam注解，本例中不是body中的參數，故采用@RequestParam注解

再次改動后：

 @GetMapping("{deviceId}/statistics/warning")
 ReturnResponse statisticsWarmingPoints(@PathVariable(value = "deviceId") Long deviceId, @RequestParam Long startTime, @RequestParam Long endTime);

再次啟動后仍舊報錯：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportApplication': Unsatisfied dependency expressed through field 'reportUtils'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportUtils': Unsatisfied dependency expressed through field 'service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'reportDataOperationServiceImpl': Unsatisfied dependency expressed through field 'coreFeignClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.aimsphm.nuclear.report.feign.CoreServiceFeignClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException:
RequestParam.value() was empty on parameter 1

可以看到，現在報錯是說參數2的value注解是空，以此再次修改

@GetMapping("{deviceId}/statistics/warning")
ReturnResponse statisticsWarmingPoints(@PathVariable(value = "deviceId") Long deviceId, @RequestParam(value = "startTime") Long startTime, @RequestParam(value = "endTime") Long endTime);

然后重新啟動，成功??！

感謝各位的閱讀，以上就是“Springboot FeignClient調用報錯怎么解決”的內容了，經過本文的學習后，相信大家對Springboot FeignClient調用報錯怎么解決這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是億速云，小編將為大家推送更多相關知識點的文章，歡迎關注！