SpringBoot YML 配置ListBean

异常：
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘companyNewsService’: Unsatisfied dependency expressed through field ‘capricornSftpConfig’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘capricornSftpConfig’: Could not bind properties to CapricornSftpConfig (prefix=capricorn.sftp, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.beans.InvalidPropertyException: Invalid property ‘types[1]’ of bean class [com.hoau.capricorn.util.sftp.CapricornSftpConfig]: Illegal attempt to get property ‘types’ threw exception; nested exception is org.springframework.beans.NullValueInNestedPathException: Invalid property ‘types[1]’ of bean class [com.hoau.capricorn.util.sftp.CapricornSftpConfig]: Cannot access indexed value of property referenced in indexed property path ‘types[1]’: returned null
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory1.getObject(AbstractBeanFactory.java:306)atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)atorg.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 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.doResolveDependency(DefaultListableBeanFactory.java:1138) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor1.getObject(AbstractBeanFactory.java:306)atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)atorg.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
… 19 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘capricornSftpConfig’: Could not bind properties to CapricornSftpConfig (prefix=capricorn.sftp, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.beans.InvalidPropertyException: Invalid property ‘types[1]’ of bean class [com.hoau.capricorn.util.sftp.CapricornSftpConfig]: Illegal attempt to get property ‘types’ threw exception; nested exception is org.springframework.beans.NullValueInNestedPathException: Invalid property ‘types[1]’ of bean class [com.hoau.capricorn.util.sftp.CapricornSftpConfig]: Cannot access indexed value of property referenced in indexed property path ‘types[1]’: returned null
at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:334)
at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:291)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:409)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1620)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory1.getObject(AbstractBeanFactory.java:306)atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)atorg.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 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.doResolveDependency(DefaultListableBeanFactory.java:1138) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor1.getObject(AbstractBeanFactory.java:306)atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)atorg.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
… 32 common frames omitted
Caused by: org.springframework.beans.InvalidPropertyException: Invalid property ‘types[1]’ of bean class [com.hoau.capricorn.util.sftp.CapricornSftpConfig]: Illegal attempt to get property ‘types’ threw exception; nested exception is org.springframework.beans.NullValueInNestedPathException: Invalid property ‘types[1]’ of bean class [com.hoau.capricorn.util.sftp.CapricornSftpConfig]: Cannot access indexed value of property referenced in indexed property path ‘types[1]’: returned null
at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:722)
at org.springframework.beans.AbstractNestablePropertyAccessor.getNestedPropertyAccessor(AbstractNestablePropertyAccessor.java:850)
at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyAccessorForPropertyPath(AbstractNestablePropertyAccessor.java:827)
at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:270)
at org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanWrapper.setPropertyValue(RelaxedDataBinder.java:699)
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:95)
at org.springframework.validation.DataBinder.applyPropertyValues(DataBinder.java:859)
at org.springframework.validation.DataBinder.doBind(DataBinder.java:755)
at org.springframework.boot.bind.RelaxedDataBinder.doBind(RelaxedDataBinder.java:128)
at org.springframework.validation.DataBinder.bind(DataBinder.java:740)
at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:272)
at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:240)
at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:329)
… 45 common frames omitted
Caused by: org.springframework.beans.NullValueInNestedPathException: Invalid property ‘types[1]’ of bean class [com.hoau.capricorn.util.sftp.CapricornSftpConfig]: Cannot access indexed value of property referenced in indexed property path ‘types[1]’: returned null
at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:653)
… 57 common frames omitted

如果将1⃣️代码写在集合空判断之下，那么this.types就永远都不会被赋值，而后面的yml配置解析用到getTypes时，就会报错了

 /*** @ConfigurationProperties整个是使用反射实例化对象，然后一点一点的填充值* 初始化时types是一个空list，将这个空列表塞到配置类实例中之后，再逐步将yml配置文件* 中的值解析出来，填充到list中**/public void setTypes(List<ItemDto> types) { //set方法只会执行一次this.types = types;   //1⃣️if (CollectionUtils.isEmpty(types)){return;    //代码会从这里返回}for (Integer i= 0; i< types.size(); i++){types.get(i).setCode(i.toString());}}public List<ItemDto> getTypes() {return types;}

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