Caused by: java.lang.IllegalStateException: Could not resolve element type of Iterable type @。。。。。web.bind.annotation.RequestParam java.util.List<?>. Not declared?

错误提示如下

报错信息看头和尾，中间过程不准确

2020-08-16 18:06:27 |ERROR |main |SpringApplication.java:826 |org.springframework.boot.SpringApplication |Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eduChapterController': Unsatisfied dependency expressed through field 'chapterService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eduChapterServiceImpl': Unsatisfied dependency expressed through field 'videoService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eduVideoServiceImpl': Unsatisfied dependency expressed through field 'vodClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.atguigu.eduservice.client.VodClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Could not resolve element type of Iterable type @io.swagger.annotations.ApiParam @org.springframework.web.bind.annotation.RequestParam java.util.List<?>. Not declared?
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
    at com.atguigu.eduservice.EduApplication.main(EduApplication.java:16)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eduChapterServiceImpl': Unsatisfied dependency expressed through field 'videoService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eduVideoServiceImpl': Unsatisfied dependency expressed through field 'vodClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.atguigu.eduservice.client.VodClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Could not resolve element type of Iterable type @io.swagger.annotations.ApiParam @org.springframework.web.bind.annotation.RequestParam java.util.List<?>. Not declared?
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636)
    ... 19 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eduVideoServiceImpl': Unsatisfied dependency expressed through field 'vodClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.atguigu.eduservice.client.VodClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Could not resolve element type of Iterable type @io.swagger.annotations.ApiParam @org.springframework.web.bind.annotation.RequestParam java.util.List<?>. Not declared?
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636)
    ... 32 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.atguigu.eduservice.client.VodClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: Could not resolve element type of Iterable type @io.swagger.annotations.ApiParam @org.springframework.web.bind.annotation.RequestParam java.util.List<?>. Not declared?
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:178)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1818)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1266)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:260)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1510)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1467)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1250)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636)
    ... 45 common frames omitted
Caused by: java.lang.IllegalStateException: Could not resolve element type of Iterable type @io.swagger.annotations.ApiParam @org.springframework.web.bind.annotation.RequestParam java.util.List<?>. Not declared?
    at feign.Util.checkState(Util.java:130)
    at org.springframework.cloud.openfeign.support.SpringMvcContract.createTypeDescriptor(SpringMvcContract.java:136)
    at org.springframework.cloud.openfeign.support.SpringMvcContract.processAnnotationsOnParameter(SpringMvcContract.java:298)
    at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:110)
    at org.springframework.cloud.openfeign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:188)
    at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:66)
    at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:154)
    at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:52)
    at feign.Feign$Builder.target(Feign.java:251)
    at org.springframework.cloud.openfeign.HystrixTargeter.target(HystrixTargeter.java:38)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:242)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:271)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:251)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:171)
    ... 56 common frames omitted

Process finished with exit code 1

分析

Caused by: java.lang.IllegalStateException: Could not resolve element type of Iterable type @io.swagger.annotations.ApiParam @org.springframework.web.bind.annotation.RequestParam java.util.List<?>. Not declared?

原因：不能转换这个实体的类型，哪个类型？在List<>集合中？的类型。

需要在List<>提供泛型，如果不指定就不能提供转换

加泛型

@ApiOperation(value = "批量删除视频")
    @DeleteMapping("/eduvod/video/delete-batch")
    public R deleteBatch(
            @ApiParam(name = "videoIdList", value = "云端视频id", required = true)
            @RequestParam("videoIdList") List<String> videoIdList);

没加上的地方都加上泛型

 成功了