Spring-framework应用程序启动loadtime源码分析笔记（一）

1，实例化DefaultListableBeanFactory

DefaultListableBeanFactory是AnnotationConfigApplicationContext的组件，DefaultListableBeanFactory在AnnotationConfigApplicationContext实例化时被实例化。在SpringApplication.createApplicationContext()判断实例化那种类型ApplicationContext。DefaultListableBeanFactory实例化stack如下

Thread [main] (Suspended (breakpoint at line 181 in DefaultListableBeanFactory))

DefaultListableBeanFactory.<init>() line: 181

AnnotationConfigApplicationContext(GenericApplicationContext).<init>() line: 109

AnnotationConfigApplicationContext.<init>() line: 64

NativeConstructorAccessorImpl.newInstance0(Constructor<?>, Object[]) line: not available [native method]

NativeConstructorAccessorImpl.newInstance(Object[]) line: 62

DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45

Constructor<T>.newInstance(Object...) line: 423

BeanUtils.instantiateClass(Constructor<T>, Object...) line: 146

BeanUtils.instantiateClass(Class<T>) line: 106

SpringApplication.createApplicationContext() line: 586

SpringApplication.run(String...) line: 321

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

Spring应用启动首先加载所有由spring容器管理对象的类定义保存在DefaultListableBeanFactory.beanDefinitionMap和DefaultListableBeanFactory.beanDefinitionNames，beanDefinitionNames记录排序如下图。

第一个注册的是org.springframework.context.annotation.internalConfigurationAnnotationProcessor，在AnnotationConfigApplicationContext对象创建时注册如下面stack

Thread [main] (Suspended (breakpoint at line 779 in DefaultListableBeanFactory))

DefaultListableBeanFactory.registerBeanDefinition(String, BeanDefinition) line: 779

AnnotationConfigApplicationContext(GenericApplicationContext).registerBeanDefinition(String, BeanDefinition) line: 324

AnnotationConfigUtils.registerPostProcessor(BeanDefinitionRegistry, RootBeanDefinition, String) line: 219

AnnotationConfigUtils.registerAnnotationConfigProcessors(BeanDefinitionRegistry, Object) line: 164

AnnotationConfigUtils.registerAnnotationConfigProcessors(BeanDefinitionRegistry) line: 135

AnnotatedBeanDefinitionReader.<init>(BeanDefinitionRegistry, Environment) line: 87

AnnotatedBeanDefinitionReader.<init>(BeanDefinitionRegistry) line: 70

AnnotationConfigApplicationContext.<init>() line: 65

NativeConstructorAccessorImpl.newInstance0(Constructor<?>, Object[]) line: not available [native method]

NativeConstructorAccessorImpl.newInstance(Object[]) line: 62

DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45

Constructor<T>.newInstance(Object...) line: 423

BeanUtils.instantiateClass(Constructor<T>, Object...) line: 146

BeanUtils.instantiateClass(Class<T>) line: 106

SpringApplication.createApplicationContext() line: 586

SpringApplication.run(String...) line: 321

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

AnnotationConfigUtils注册容器级processors，源码截图

2，SpringApplication.prepareContext()

spring-boot启动添加不由容器管理的BeanFactoryPostProcessor，实例化后直接保存在AbstractApplicationContext.beanFactoryPostProcessors。BeanFactoryPostProcessor包括以下

org.springframework.boot.context.ConfigurationWarningsApplicationContextInitializer$ConfigurationWarningsPostProcessor

org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer$CachingMetadataReaderFactoryPostProcessor

org.springframework.boot.context.config.ConfigFileApplicationListener$PropertySourceOrderingPostProcessor

Thread [main] (Suspended (breakpoint at line 477 in AbstractApplicationContext))

AnnotationConfigApplicationContext(AbstractApplicationContext).addBeanFactoryPostProcessor(BeanFactoryPostProcessor) line: 477

ConfigurationWarningsApplicationContextInitializer.initialize(ConfigurableApplicationContext) line: 60

SpringApplication.applyInitializers(ConfigurableApplicationContext) line: 624

SpringApplication.prepareContext(ConfigurableApplicationContext, ConfigurableEnvironment, SpringApplicationRunListeners, ApplicationArguments, Banner) line: 364

SpringApplication.run(String...) line: 325

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

注册完内部处理器类定义后再到用户级入口类定义注册，application是用户级的顶层类。

Thread [main] (Suspended (breakpoint at line 779 in DefaultListableBeanFactory))

DefaultListableBeanFactory.registerBeanDefinition(String, BeanDefinition) line: 779

AnnotationConfigApplicationContext(GenericApplicationContext).registerBeanDefinition(String, BeanDefinition) line: 324

BeanDefinitionReaderUtils.registerBeanDefinition(BeanDefinitionHolder, BeanDefinitionRegistry) line: 150

AnnotatedBeanDefinitionReader.doRegisterBean(Class<T>, Supplier<T>, String, Class<Annotation>[], BeanDefinitionCustomizer...) line: 246

AnnotatedBeanDefinitionReader.registerBean(Class<?>) line: 145

AnnotatedBeanDefinitionReader.register(Class<?>...) line: 135

BeanDefinitionLoader.load(Class<?>) line: 159

BeanDefinitionLoader.load(Object) line: 135

BeanDefinitionLoader.load() line: 127

SpringApplication.load(ApplicationContext, Object[]) line: 692

SpringApplication.prepareContext(ConfigurableApplicationContext, ConfigurableEnvironment, SpringApplicationRunListeners, ApplicationArguments, Banner) line: 381

SpringApplication.run(String...) line: 325

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

3，AbstractApplicationContext.prepareBeanFactory()

准备容器beanFactory对象，添加两个必要beanPostProcessor到DefaultListableBeanFactory.beanPostProcessors，分别是org.springframework.context.support.ApplicationContextAwareProcessor和org.springframework.context.support.ApplicationListenerDetector，用于后面其它对象实例化时调用，每个beanPostProcessor有不能的增加功能。DefaultListableBeanFactory.createBean()执行时在适当时执行beanPostProcessors对应方法。参照文档Customizing beans using a BeanPostProcessor

Thread [main] (Suspended (breakpoint at line 849 in AbstractBeanFactory))

owns: Object (id=74)

DefaultListableBeanFactory(AbstractBeanFactory).addBeanPostProcessor(BeanPostProcessor) line: 849

AnnotationConfigApplicationContext(AbstractApplicationContext).prepareBeanFactory(ConfigurableListableBeanFactory) line: 633

AnnotationConfigApplicationContext(AbstractApplicationContext).refresh() line: 517

SpringApplication.refresh(ApplicationContext) line: 750

SpringApplication.refreshContext(ConfigurableApplicationContext) line: 386

SpringApplication.run(String...) line: 327

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

4，AbstractApplicationContext.invokeBeanFactoryPostProcessors()

invokeBeanFactoryPostProcessors()方法在AnnotationConfigApplicationContext(AbstractApplicationContext).refresh()被调用。实例化注册在DefaultListableBeanFactory.beanDefinitionNames容器级BeanFactoryPostProcessors如org.springframework.context.annotation.internalConfigurationAnnotationProcessor等。参照文档Customizing configuration metadata with aBeanFactoryPostProcessor执行所有BeanFactoryPostProcessor.postProcessBeanFactory()如下图：

注册org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory

Thread [main] (Suspended (breakpoint at line 779 in DefaultListableBeanFactory))

owns: Object (id=83)

DefaultListableBeanFactory.registerBeanDefinition(String, BeanDefinition) line: 779

SharedMetadataReaderFactoryContextInitializer$CachingMetadataReaderFactoryPostProcessor.register(BeanDefinitionRegistry) line: 90

SharedMetadataReaderFactoryContextInitializer$CachingMetadataReaderFactoryPostProcessor.postProcessBeanDefinitionRegistry(BeanDefinitionRegistry) line: 83

PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory, List<BeanFactoryPostProcessor>) line: 69

AnnotationConfigApplicationContext(AbstractApplicationContext).invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory) line: 686

AnnotationConfigApplicationContext(AbstractApplicationContext).refresh() line: 524

SpringApplication.refresh(ApplicationContext) line: 750

SpringApplication.refreshContext(ConfigurableApplicationContext) line: 386

SpringApplication.run(String...) line: 327

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

实例化ConfigurationClassPostProcessor，这是BeanFactoryPostProcessor

Thread [main] (Suspended (modification of field sourceExtractor in ConfigurationClassPostProcessor))

owns: ConcurrentHashMap<K,V> (id=2116)

owns: Object (id=2117)

ConfigurationClassPostProcessor.<init>() line: 95

NativeConstructorAccessorImpl.newInstance0(Constructor<?>, Object[]) line: not available [native method]

NativeConstructorAccessorImpl.newInstance(Object[]) line: 62

DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45

Constructor<T>.newInstance(Object...) line: 423

BeanUtils.instantiateClass(Constructor<T>, Object...) line: 146

CglibSubclassingInstantiationStrategy(SimpleInstantiationStrategy).instantiate(RootBeanDefinition, String, BeanFactory) line: 88

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).instantiateBean(String, RootBeanDefinition) line: 1235

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).createBeanInstance(String, RootBeanDefinition, Object[]) line: 1142

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).doCreateBean(String, RootBeanDefinition, Object[]) line: 542

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).createBean(String, RootBeanDefinition, Object[]) line: 498

DefaultListableBeanFactory(AbstractBeanFactory).lambda$doGetBean$0(String, RootBeanDefinition, Object[]) line: 305

2099051403.getObject() line: not available

DefaultListableBeanFactory(DefaultSingletonBeanRegistry).getSingleton(String, ObjectFactory<?>) line: 233

DefaultListableBeanFactory(AbstractBeanFactory).doGetBean(String, Class<T>, Object[], boolean) line: 303

DefaultListableBeanFactory(AbstractBeanFactory).getBean(String, Class<T>) line: 198

PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory, List<BeanFactoryPostProcessor>) line: 88

AnnotationConfigApplicationContext(AbstractApplicationContext).invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory) line: 686

AnnotationConfigApplicationContext(AbstractApplicationContext).refresh() line: 524

SpringApplication.refresh(ApplicationContext) line: 750

SpringApplication.refreshContext(ConfigurableApplicationContext) line: 386

SpringApplication.run(String...) line: 327

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

如果使用kafka配置，注册kafka处理器类定义，KafkaListenerAnnotationBeanPostProcessor对象定义注册在DefaultListableBeanFactory.registerBeanDefinition()，使用名称为KafkaListenerConfigUtils.KAFKA_LISTENER_ANNOTATION_PROCESSOR_BEAN_NAME，如下列stack:

Thread [main] (Suspended (breakpoint at line 779 in DefaultListableBeanFactory))

owns: Object (id=130)

DefaultListableBeanFactory.registerBeanDefinition(String, BeanDefinition) line: 779

ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(BeanMethod) line: 262

ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClass, ConfigurationClassBeanDefinitionReader$TrackedConditionEvaluator) line: 141

ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(Set<ConfigurationClass>) line: 117

ConfigurationClassPostProcessor.processConfigBeanDefinitions(BeanDefinitionRegistry) line: 320

ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(BeanDefinitionRegistry) line: 229

PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(Collection<BeanDefinitionRegistryPostProcessor>, BeanDefinitionRegistry) line: 271

PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory, List<BeanFactoryPostProcessor>) line: 94

AnnotationConfigApplicationContext(AbstractApplicationContext).invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory) line: 686

AnnotationConfigApplicationContext(AbstractApplicationContext).refresh() line: 524

SpringApplication.refresh(ApplicationContext) line: 750

SpringApplication.refreshContext(ConfigurableApplicationContext) line: 386

SpringApplication.run(String...) line: 327

SpringApplication.run(Class<?>[], String[]) line: 1245

SpringApplication.run(Class<?>, String...) line: 1233

Application.main(String[]) line: 51

5，AbstractApplicationContext.registerBeanPostProcessors()

实例化和添加更多beanProcessor，包括实例化DefaultListableBeanFactory时注册在DefaultListableBeanFactory.beanDefinitionNames的org.springframework.context.annotation.internalAutowiredAnnotationProcessor等processor。部分beanProcessor如下

org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor@34448e6c

org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor@435ce306

org.springframework.context.annotation.CommonAnnotationBeanPostProcessor@907f2b7

org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor@1ce93c18

org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor@60e9df3c

6，AbstractApplicationContext).finishBeanFactoryInitialization()

实例化余下非延时加载单列对象，单列对象保存在DefaultSingletonBeanRegistry.singletonObjects

首先实例化LoadTimeWeaverAware类，如LocalContainerEntityManagerFactoryBean类实例化，源码如下

其他类实例化源码如下

Thread [main] (Suspended (breakpoint at line 64 in MethodKafkaListenerEndpoint))

owns: ConcurrentHashMap<K,V> (id=86)

owns: Object (id=87)

MethodKafkaListenerEndpoint<K,V>.setBean(Object) line: 64

KafkaListenerAnnotationBeanPostProcessor<K,V>.processListener(MethodKafkaListenerEndpoint<?,?>, KafkaListener, Object, Object, String) line: 377

KafkaListenerAnnotationBeanPostProcessor<K,V>.processKafkaListener(KafkaListener, Method, Object, String) line: 340

KafkaListenerAnnotationBeanPostProcessor<K,V>.postProcessAfterInitialization(Object, String) line: 270

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).applyBeanPostProcessorsAfterInitialization(Object, String) line: 435

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).initializeBean(String, Object, RootBeanDefinition) line: 1721

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).doCreateBean(String, RootBeanDefinition, Object[]) line: 581

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).createBean(String, RootBeanDefinition, Object[]) line: 498

DefaultListableBeanFactory(AbstractBeanFactory).lambda$doGetBean$0(String, RootBeanDefinition, Object[]) line: 305

2099051403.getObject() line: not available

DefaultListableBeanFactory(DefaultSingletonBeanRegistry).getSingleton(String, ObjectFactory<?>) line: 233

DefaultListableBeanFactory(AbstractBeanFactory).doGetBean(String, Class<T>, Object[], boolean) line: 303

DefaultListableBeanFactory(AbstractBeanFactory).getBean(String, Class<T>) line: 198

CommonAnnotationBeanPostProcessor.autowireResource(BeanFactory, CommonAnnotationBeanPostProcessor$LookupElement, String) line: 512

CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor$LookupElement, String) line: 483

CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(Object, String) line: 617

CommonAnnotationBeanPostProcessor$ResourceElement(InjectionMetadata$InjectedElement).inject(Object, String, PropertyValues) line: 172

InjectionMetadata.inject(Object, String, PropertyValues) line: 89

CommonAnnotationBeanPostProcessor.postProcessPropertyValues(PropertyValues, PropertyDescriptor[], Object, String) line: 317

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).populateBean(String, RootBeanDefinition, BeanWrapper) line: 1353

DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).doCreateBean(String, RootBeanDefinition, Object[]) line: 579