ClassPathScanningCandidateComponentProvider

原创 已于 2022-05-12 19:25:51 修改 · 184 阅读 · 0 ·
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#css #css3 #前端

于 2021-12-27 12:42:58 首次发布
本文解析findCandidateComponents与ScanCandidateComponents方法，深入剖析如何从basePackage获取并管理项目中的类，适用于基础包下的类查找与管理策略。

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findCandidateComponents

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ScanCandidateComponents在这里插入图片描述

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从basePackage下拿到所有class

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Feign源码深度刨析-(2)组件扫描器:ClassPathScanningCandidateComponentProvider
知秋的博客
08-16 833
“不积跬步，无以至千里。” 这篇文章，一起来看看feign的核心机制，看看是如何扫描所有包下的@FeignClient注解的接口 入口就是这个registerFeignClients(metadata, registry)方法 public void registerFeignClients(AnnotationMetadata metadata, BeanDefinitionRegistry registry) { ClassP.
【spring如何扫描一个路径下被注解修饰的类】
最新发布
weixin_47068446的博客
10-20 456
我们利用Spring框架或者SpringBoot框架经常会自己写一些注解，来方便自己的业务使用，但是我们如何获取到被注解修饰的类或方法，是一个值得探讨的问题，下面我们会具体分析一些demo来给出路径下某些被注解修饰的类的方案。下面的case是我们获取org.apache.dubbo.springboot.demo下的被@Service修饰的类。4.返回每个匹配类的 BeanDefinition。2.扫描出所有 .class 文件；4.判断类上是否包含指定注解；1.按包扫描 class；
ClassPathScanningCandidateComponentProvider 扫描给定包及其子包的类
Leon_Jinhai_Sun的博客
11-16 1282
ClassPathScanningCandidateComponentProvider 类的findCandidateComponents()方法具体实现扫描给定类路径包的功能，主要源码如下： //保存过滤规则要包含的注解，即Spring默认的@Component、@Repository、@Service、 //@Controller注解的Bean，以及JavaEE6的@ManagedBean和JSR-330的@Named注解 private final List<TypeFilter> i
classpathscanningcandidatecomponentprovider
03-16
classpathscanningcandidatecomponentprovider是一个类路径扫描候选组件提供者，它可以扫描类路径中的所有类，并将符合条件的类作为候选组件提供给容器。这个类通常用于Spring框架中，用于自动扫描并注册组件。
TypeFilter传递给ClassPathScanningCandidateComponentProvider
05-27
在使用ClassPathScanningCandidateComponentProvider扫描类的时候，我们可以通过调用addIncludeFilter和addExcludeFilter方法来添加需要包含和需要排除的类，这里我们可以将自定义的TypeFilter传递给...
[INFO] [INFO] ------------------------< org.example:ssm_demo >------------------------ [INFO] Building ssm_demo 1.0-SNAPSHOT [INFO] --------------------------------[ war ]--------------------------------- [INFO] [INFO] >>> tomcat7-maven-plugin:2.1:run (default-cli) > process-classes @ ssm_demo >>> [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ ssm_demo --- [INFO] Using &#39;UTF-8&#39; encoding to copy filtered resources. [INFO] Copying 1 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ ssm_demo --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] <<< tomcat7-maven-plugin:2.1:run (default-cli) < process-classes @ ssm_demo <<< [INFO] [INFO] [INFO] --- tomcat7-maven-plugin:2.1:run (default-cli) @ ssm_demo --- [INFO] Running war on http://localhost:8080/ [INFO] Using existing Tomcat server configuration at D:\idea\idea2022\workspace\ssm_demo\target\tomcat [INFO] create webapp with contextPath: 10月 03, 2025 7:43:46 下午 org.apache.coyote.AbstractProtocol init 信息: Initializing ProtocolHandler ["http-bio-8080"] 10月 03, 2025 7:43:46 下午 org.apache.catalina.core.StandardService startInternal 信息: Starting service Tomcat 10月 03, 2025 7:43:46 下午 org.apache.catalina.core.StandardEngine startInternal 信息: Starting Servlet Engine: Apache Tomcat/7.0.37 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.ApplicationContext log 信息: 1 Spring WebApplicationInitializers detected on classpath 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.ApplicationContext log 信息: Initializing Spring root WebApplicationContext [INFO] Root WebApplicationContext: initialization started [WARNING] Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn&#39;t supported yet: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 61 [ERROR] Context initialization failed org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn&#39;t supported yet: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 61 at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents (ClassPathScanningCandidateComponentProvider.java:452) at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents (ClassPathScanningCandidateComponentProvider.java:315) at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan (ClassPathBeanDefinitionScanner.java:276) at org.springframework.context.annotation.ComponentScanAnnotationParser.parse (ComponentScanAnnotationParser.java:132) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass (ConfigurationClassParser.java:296) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass (ConfigurationClassParser.java:250) at org.springframework.context.annotation.ConfigurationClassParser.parse (ConfigurationClassParser.java:207) at org.springframework.context.annotation.ConfigurationClassParser.parse (ConfigurationClassParser.java:175) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions (ConfigurationClassPostProcessor.java:319) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry (ConfigurationClassPostProcessor.java:236) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors (PostProcessorRegistrationDelegate.java:280) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors (PostProcessorRegistrationDelegate.java:96) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors (AbstractApplicationContext.java:707) at org.springframework.context.support.AbstractApplicationContext.refresh (AbstractApplicationContext.java:533) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext (ContextLoader.java:401) at org.springframework.web.context.ContextLoader.initWebApplicationContext (ContextLoader.java:292) at org.springframework.web.context.ContextLoaderListener.contextInitialized (ContextLoaderListener.java:103) at org.apache.catalina.core.StandardContext.listenerStart (StandardContext.java:4797) at org.apache.catalina.core.StandardContext.startInternal (StandardContext.java:5291) at org.apache.catalina.util.LifecycleBase.start (LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call (ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call (ContainerBase.java:1549) at java.util.concurrent.FutureTask.run (FutureTask.java:264) at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1136) at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:635) at java.lang.Thread.run (Thread.java:833) Caused by: org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn&#39;t supported yet: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 61 at org.springframework.core.type.classreading.SimpleMetadataReader.getClassReader (SimpleMetadataReader.java:60) at org.springframework.core.type.classreading.SimpleMetadataReader.<init> (SimpleMetadataReader.java:49) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader (SimpleMetadataReaderFactory.java:103) at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader (CachingMetadataReaderFactory.java:123) at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents (ClassPathScanningCandidateComponentProvider.java:429) at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents (ClassPathScanningCandidateComponentProvider.java:315) at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan (ClassPathBeanDefinitionScanner.java:276) at org.springframework.context.annotation.ComponentScanAnnotationParser.parse (ComponentScanAnnotationParser.java:132) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass (ConfigurationClassParser.java:296) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass (ConfigurationClassParser.java:250) at org.springframework.context.annotation.ConfigurationClassParser.parse (ConfigurationClassParser.java:207) at org.springframework.context.annotation.ConfigurationClassParser.parse (ConfigurationClassParser.java:175) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions (ConfigurationClassPostProcessor.java:319) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry (ConfigurationClassPostProcessor.java:236) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors (PostProcessorRegistrationDelegate.java:280) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors (PostProcessorRegistrationDelegate.java:96) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors (AbstractApplicationContext.java:707) at org.springframework.context.support.AbstractApplicationContext.refresh (AbstractApplicationContext.java:533) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext (ContextLoader.java:401) at org.springframework.web.context.ContextLoader.initWebApplicationContext (ContextLoader.java:292) at org.springframework.web.context.ContextLoaderListener.contextInitialized (ContextLoaderListener.java:103) at org.apache.catalina.core.StandardContext.listenerStart (StandardContext.java:4797) at org.apache.catalina.core.StandardContext.startInternal (StandardContext.java:5291) at org.apache.catalina.util.LifecycleBase.start (LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call (ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call (ContainerBase.java:1549) at java.util.concurrent.FutureTask.run (FutureTask.java:264) at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1136) at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:635) at java.lang.Thread.run (Thread.java:833) Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 61 at org.springframework.asm.ClassReader.<init> (ClassReader.java:196) at org.springframework.asm.ClassReader.<init> (ClassReader.java:177) at org.springframework.asm.ClassReader.<init> (ClassReader.java:163) at org.springframework.asm.ClassReader.<init> (ClassReader.java:284) at org.springframework.core.type.classreading.SimpleMetadataReader.getClassReader (SimpleMetadataReader.java:57) at org.springframework.core.type.classreading.SimpleMetadataReader.<init> (SimpleMetadataReader.java:49) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader (SimpleMetadataReaderFactory.java:103) at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader (CachingMetadataReaderFactory.java:123) at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents (ClassPathScanningCandidateComponentProvider.java:429) at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents (ClassPathScanningCandidateComponentProvider.java:315) at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan (ClassPathBeanDefinitionScanner.java:276) at org.springframework.context.annotation.ComponentScanAnnotationParser.parse (ComponentScanAnnotationParser.java:132) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass (ConfigurationClassParser.java:296) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass (ConfigurationClassParser.java:250) at org.springframework.context.annotation.ConfigurationClassParser.parse (ConfigurationClassParser.java:207) at org.springframework.context.annotation.ConfigurationClassParser.parse (ConfigurationClassParser.java:175) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions (ConfigurationClassPostProcessor.java:319) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry (ConfigurationClassPostProcessor.java:236) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors (PostProcessorRegistrationDelegate.java:280) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors (PostProcessorRegistrationDelegate.java:96) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors (AbstractApplicationContext.java:707) at org.springframework.context.support.AbstractApplicationContext.refresh (AbstractApplicationContext.java:533) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext (ContextLoader.java:401) at org.springframework.web.context.ContextLoader.initWebApplicationContext (ContextLoader.java:292) at org.springframework.web.context.ContextLoaderListener.contextInitialized (ContextLoaderListener.java:103) at org.apache.catalina.core.StandardContext.listenerStart (StandardContext.java:4797) at org.apache.catalina.core.StandardContext.startInternal (StandardContext.java:5291) at org.apache.catalina.util.LifecycleBase.start (LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call (ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call (ContainerBase.java:1549) at java.util.concurrent.FutureTask.run (FutureTask.java:264) at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1136) at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:635) at java.lang.Thread.run (Thread.java:833) 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.StandardContext listenerStart 严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn&#39;t supported yet: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 61 at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:452) at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:315) at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:276) at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:132) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:296) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:250) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:207) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:175) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:319) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:280) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:96) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:707) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:533) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4797) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5291) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn&#39;t supported yet: URL [jar:file:/D:/BaiduNetdiskDownload/Maven%203.6.3/apache-maven-3.6.3/repository/com/itheima/maven_02_po/1.0-SNAPSHOT/maven_02_po-1.0-SNAPSHOT.jar!/com/itheima/po/Book.class]; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 61 at org.springframework.core.type.classreading.SimpleMetadataReader.getClassReader(SimpleMetadataReader.java:60) at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:49) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:103) at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:123) at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:429) ... 25 more Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 61 at org.springframework.asm.ClassReader.<init>(ClassReader.java:196) at org.springframework.asm.ClassReader.<init>(ClassReader.java:177) at org.springframework.asm.ClassReader.<init>(ClassReader.java:163) at org.springframework.asm.ClassReader.<init>(ClassReader.java:284) at org.springframework.core.type.classreading.SimpleMetadataReader.getClassReader(SimpleMetadataReader.java:57) ... 29 more 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.StandardContext startInternal 严重: Error listenerStart 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.StandardContext startInternal 严重: Context [] startup failed due to previous errors 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.ApplicationContext log 信息: Closing Spring root WebApplicationContext 10月 03, 2025 7:43:48 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 严重: The web application [] registered the JDBC driver [com.mysql.cj.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 10月 03, 2025 7:43:48 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 严重: The web application [] registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 10月 03, 2025 7:43:48 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 严重: The web application [] registered the JDBC driver [com.alibaba.druid.mock.MockDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 10月 03, 2025 7:43:48 下午 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads 严重: The web application [] appears to have started a thread named [mysql-cj-abandoned-connection-cleanup] but has failed to stop it. This is very likely to create a memory leak. 10月 03, 2025 7:43:48 下午 org.apache.catalina.loader.WebappClassLoader checkThreadLocalsForLeaks 警告: Failed to check for ThreadLocal references for web application [] java.lang.reflect.InaccessibleObjectException: Unable to make field java.lang.ThreadLocal$ThreadLocalMap java.lang.Thread.threadLocals accessible: module java.base does not "opens java.lang" to unnamed module @2c7106d9 at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354) at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178) at java.base/java.lang.reflect.Field.setAccessible(Field.java:172) at org.apache.catalina.loader.WebappClassLoader.checkThreadLocalsForLeaks(WebappClassLoader.java:2434) at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:1995) at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1901) at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:662) at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232) at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5526) at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.ContainerBase startInternal 严重: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to stop component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]] at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: org.apache.catalina.LifecycleException: Failed to stop component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]] at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:236) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160) ... 6 more Caused by: org.apache.catalina.LifecycleException: Failed to stop component [WebappLoader[]] at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:236) at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5526) at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232) ... 7 more Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.lang.ClassLoader sun.rmi.transport.Target.ccl accessible: module java.rmi does not "opens sun.rmi.transport" to unnamed module @2c7106d9 at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354) at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178) at java.base/java.lang.reflect.Field.setAccessible(Field.java:172) at org.apache.catalina.loader.WebappClassLoader.clearReferencesRmiTargets(WebappClassLoader.java:2629) at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:1998) at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1901) at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:662) at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232) ... 9 more 10月 03, 2025 7:43:48 下午 org.apache.catalina.core.ContainerBase startInternal 严重: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost]] at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.startup.Tomcat.start(Tomcat.java:335) at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.startContainer(AbstractRunMojo.java:1091) at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.execute(AbstractRunMojo.java:512) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:210) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:156) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:957) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:289) at org.apache.maven.cli.MavenCli.main(MavenCli.java:193) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347) at org.codehaus.classworlds.Launcher.main(Launcher.java:47) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 6 more
10-04
类文件主版本61对应的是 Java 17，而 Spring 框架可能不兼容 Java 17，从而导致无法解析类文件，最终致使 Tomcat 启动失败。以下是可能的解决办法： #### 降低 Java 版本 把项目的 Java 版本降低到 Spring 框架支持...
怎么解决这个报错 2025-10-09 16:22:25.728 [localhost-startStop-1] ERROR org.springframework.web.context.ContextLoader Context initialization failed org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath:spring/spring-mybatis.xml] Offending resource: class path resource [spring-config.xml]; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [D:\STS\pivotal-tc-server-developer-3.1.3.SR1\base-instance\wtpwebapps\vepts_xb\WEB-INF\classes\com\anche\ajxm\webservice\HWriteDeal.class]; nested exception is java.lang.ArrayIndexOutOfBoundsException: 63498 at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:70) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:76) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:229) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:180) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:165) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:138) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:94) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:508) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:609) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:510) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) ~[spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) [spring-web-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812) [catalina.jar:na] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255) [catalina.jar:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [catalina.jar:na] at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725) [catalina.jar:na] at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) [catalina.jar:na] at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) [catalina.jar:na] at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:586) [catalina.jar:8.0.30.C] at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1777) [catalina.jar:8.0.30.C] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_101] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_101] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_101] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_101] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_101] Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [D:\STS\pivotal-tc-server-developer-3.1.3.SR1\base-instance\wtpwebapps\vepts_xb\WEB-INF\classes\com\anche\ajxm\webservice\HWriteDeal.class]; nested exception is java.lang.ArrayIndexOutOfBoundsException: 63498 at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:303) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:248) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:87) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:74) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1411) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1401) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:168) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:138) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:94) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:508) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:223) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE] ... 32 common frames omitted Caused by: java.lang.ArrayIndexOutOfBoundsException: 63498 at org.springframework.asm.ClassReader.readCode(ClassReader.java:1355) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.asm.ClassReader.readMethod(ClassReader.java:1020) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.asm.ClassReader.accept(ClassReader.java:695) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.asm.ClassReader.accept(ClassReader.java:508) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:64) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:98) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:102) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE] at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:279) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE] ... 47 common frames omitted
10-10
我们正在解决Spring框架中的两个异常：BeanDefinitionParsingException和ArrayIndexOutOfBoundsException。 根据错误信息，BeanDefinitionParsingException是由于导入bean定义文件失败（具体文件：classpath:spring...
@Order(value = Integer.MIN_VALUE) public class ConfigStartUpListener implements ApplicationListener<ContextRefreshedEvent> { @Override public void onApplicationEvent(ContextRefreshedEvent event) { if (event.getApplicationContext().getParent() != null) { return; } // get all Config instances Map<String, Object> beans = event.getApplicationContext().getBeansWithAnnotation(JRiskConfig.class); Collection<Object> configs = beans.values(); ApplicationContext applicationContext = event.getApplicationContext(); ConfigurationInitializer configurationInitializer = new ConfigurationInitializer(ConfigurationManager.getInstance()); configurationInitializer.setExtConfigs(configs); configurationInitializer.init(); } } public static <T extends Annotation> void scanClzAnnotatedWith(String SCAN_BASE_PACKAGE, Class<T> annotationType, BiConsumer<T, Class<?>> callBack){ ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false); provider.addIncludeFilter(new AnnotationTypeFilter(annotationType)); Set<BeanDefinition> beanDefinitions = provider.findCandidateComponents(SCAN_BASE_PACKAGE); if (CollectionUtils.isEmpty(beanDefinitions)) { return; } for (BeanDefinition beanDefinition : beanDefinitions) { try { String beanName = beanDefinition.getBeanClassName(); Class<?> clz = Class.forName(beanName); T annotation = clz.getAnnotation(annotationType); if(annotation == null){ continue; } callBack.accept(annotation, clz); } catch (Exception e) { System.out.println("init service met with exception" + e); } } } }这两个方法中，我想要在scanClzAnnotatedWith中拿到等同于ConfigStartUpListener中beans.values()的值，是哪一部分
07-31
1. **扫描带有特定注解的类**：使用反射或类路径扫描工具（如 `ClassPathScanningCandidateComponentProvider`）查找所有带有指定注解的类。 2. **实例化这些类并收集 Bean 对象**：通过反射创建这些类的实例，并将...
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https://www.cnblogs.com/aspirant/p/10649202.html https://blog.csdn.net/qq_30038111/article/details/82703383 https://www.jianshu.com/p/369d3fdb0148
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