SpringBoot启动关键点解析 及启动日志追溯
<!doctype html>Spring Boot 源码阅读2
目录
目录1 SpringBoot启动关键点解析1.1 new SpringApplication(primarySources)部分1.2 run(args)部分1.2.1 ConfigurableEnvironment提供的服务（关注的信息）1.2.2 ConfigurableApplicationContext1.2.3 SpringApplication.prepareContext1.2.4 SpringApplication.refreshContext1.2.4.1 AbstractApplicationContext.finishBeanFactoryInitialization1.2.4.2 DefaultListableBeanFactory.preInstantiateSingletons1.2.5 默认的关闭钩子1.3 启动日志分析1.3.1 虚拟机启动日志打印1.3.2 Banner打印1.3.3 环境信息打印1.3.4 web服务启动日志1.3.5 实例化相关信息打印1.3.6 web启动打印1.3.7 启动成功日志
1 SpringBoot启动关键点解析
启动核心分为两部分new SpringApplication(primarySources)和执行run(args)方法，
1.1 new SpringApplication(primarySources)部分
部分的核心是从META/spring.facteries中读取ApplicationContextInitializer和ApplicationListener配置，然后直接通过反射实例化，实例化+排序完毕后，把应用初始化器ApplicationContextInitializer和应用监听放到SpringApplication对象上
1.2 run(args)部分
run部分最核心的构建ConfigurableApplicationContext这个上下文对象对象，构建完毕后当前线程是会返回的。
run方法实现为：
x
/**
* Run the Spring application, creating and refreshing a new
* {@link ApplicationContext}.
* @param args the application arguments (usually passed from a Java main method)
* @return a running {@link ApplicationContext}
*/
public ConfigurableApplicationContext run(String... args) {
StopWatch stopWatch = new StopWatch();
stopWatch.start();
ConfigurableApplicationContext context = null;
Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();
configureHeadlessProperty();
SpringApplicationRunListeners listeners = getRunListeners(args);//获取SpringApplicationRunListener的监听，当前只有org.springframework.boot.context.event.EventPublishingRunListener一个
listeners.starting(); //调度监听的start方法，这里事件发布监听的start方法是发布了一个ApplicationStartingEvent事件
try {
ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
//创建一个ConfigurableEnvironment(理解参见1.2.1),初始化
//让configurationProperties的属性源始终位于第一（应该是保证最高优先级）
//调度应用监听执行environmentPrepared， EventPublishingRunListener一个也就是发布一个ApplicationEnvironmentPreparedEvent事件
//将获取到的environment中的spring.main配置绑定到SpringApplication的source中（这部分用到了一个Binder语法，没有看懂）
ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments);
// 从环境中读取spring.beaninfo.ignore并设置为系统属性
configureIgnoreBeanInfo(environment);
//Banner打印
Banner printedBanner = printBanner(environment);
//创建ConfigurableApplicationContext对象，这个上下文对象关注的信息有点多，参见（1.2.2）
context = createApplicationContext();
//从META_DATA/spring.facteries中读取SpringBootExceptionReporter的配置并进行实例化，默认读取出来是org.springframework.boot.diagnostics.FailureAnalyzers
exceptionReporters = getSpringFactoriesInstances(SpringBootExceptionReporter.class,
new Class[] { ConfigurableApplicationContext.class }, context);
//准备环境，参见（1.2.3），主要为设置上下文对象的容器属性
//调度一开始读取的initializer的执行initialize方法，之后调度监听器的contextPrepared，发布ApplicationContextInitializedEvent
//打印开始和profile的日志
//把拿到的标签类进行beanDefinition注册，之后调度监听器的contextLoaded，发布ApplicationPreparedEvent
prepareContext(context, environment, listeners, applicationArguments, printedBanner);
//刷新上下文，参见（1.2.4）,
refreshContext(context);
afterRefresh(context, applicationArguments);
stopWatch.stop();
if (this.logStartupInfo) {
//打印已启动信息以及耗时情况
new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), stopWatch);
}
//调度监听器的started的方法，此处默认为发布一个ApplicationStartedEvent事件
listeners.started(context);
//找注册的ApplicationRunner、CommandLineRunner，排序后分别调度对应的ApplicationRunner和CommandLineRunner （spring-boot的启动后自动执行建表语句好像就是通过这个机制实现。这里可以做一些启动后就需要立马执行的事）。注意，此时刚发布ApplicationStartedEvent而尚未发布ApplicationReadyEvent
callRunners(context, applicationArguments);
}
catch (Throwable ex) {
handleRunFailure(context, ex, exceptionReporters, listeners);
throw new IllegalStateException(ex);
}
try {
//调度监听器的running方法，此处默认为发布一个ApplicationReadyEvent事件。
//执行完次应该代表服务正式可用
listeners.running(context);
}
catch (Throwable ex) {
handleRunFailure(context, ex, exceptionReporters, null);
throw new IllegalStateException(ex);
}
return context;
}
1.2.1 ConfigurableEnvironment提供的服务（关注的信息）
从环境接口的方法来看，它主要关注与当前应用的profile、propertySource、systemEnvironment、systemProperties、getConversionService；环境本身重要的信息有webApplicationType（ConversionService是干啥的？？）
1.2.2 ConfigurableApplicationContext
从名字解读是可配置的应用容器对象。关注的内容非常多，包括应用监听器(ApplicationListener)、应用的后置处理器(PosProcessor)、应用的协议解析器(ProtocolResolver)、bean管理、类加载器、环境对象管理(Environment)、消息对象管理(Message)、资源对象管理(Resouce)等.
容器对象是根据应用类型有所不同的，SERVLET创建的是org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext的容器对象，该对象在构造时会构造一个AnnotatedBeanDefinitionReader和ClassPathBeanDefinitionScanner对象。
AnnotatedBeanDefinitionReader对象同时设置了beanFactory的dependencyComparator、autowireCandidateResolver实例，进行了ConfigurationClassPostProcessor、AutowiredAnnotationBeanPostProcessor、CommonAnnotationBeanPostProcessor、EventListenerMethodProcessor、DefaultEventListenerFactory的bean声明。
ClassPathBeanDefinitionScanner对象创建时同时TypeFilter的实例（包含AnnotationTypeFilter(Component.class)）
1.2.3 SpringApplication.prepareContext
代码如下：
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private void prepareContext(ConfigurableApplicationContext context, ConfigurableEnvironment environment,
SpringApplicationRunListeners listeners, ApplicationArguments applicationArguments, Banner printedBanner) {
context.setEnvironment(environment);
//把SpringApplication上的部分信息绑定到context上
postProcessApplicationContext(context);
//拿到之前从配置中读取并实例化的initializer，执行initialize(context)方法 ！！它们大部分都是给容器设置一些值
applyInitializers(context);
//调度监听器的contextPrepared，此处为发布一个ApplicationContextInitializedEvent事件
listeners.contextPrepared(context);
if (this.logStartupInfo) {
//打印应用启动的日志
logStartupInfo(context.getParent() == null);
//打印profile加载情况
logStartupProfileInfo(context);
}
// Add boot specific singleton beans
ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
//把ApplicationArguments注册成单例bean
beanFactory.registerSingleton("springApplicationArguments", applicationArguments);
if (printedBanner != null) {
//如果Banner非空，也注册成单例bean
beanFactory.registerSingleton("springBootBanner", printedBanner);
}
if (beanFactory instanceof DefaultListableBeanFactory) {
//设置bean工程的allowBeanDefinitionOverriding属性
((DefaultListableBeanFactory) beanFactory)
.setAllowBeanDefinitionOverriding(this.allowBeanDefinitionOverriding);
}
if (this.lazyInitialization) {
//如果是lazyInitialization模式（默认为false），给上下文追加一个LazyInitializationBeanFactoryPostProcessor的后置处理器实例
context.addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor());
}
// Load the sources -》注册的入口类被识别为私有源，需要加入更多的标签类看看是否是在这里就已经被全部识别
Set<Object> sources = getAllSources();
Assert.notEmpty(sources, "Sources must not be empty");
//把识别出来的源都进行beanDefinition注册
load(context, sources.toArray(new Object[0]));
//调度监听器的contextLoaded方法，这里表现为发布一个ApplicationPreparedEvent事件
listeners.contextLoaded(context);
}
默认读取并实例化的初始化器有：
0 = {DelegatingApplicationContextInitializer@3271} 1 = {SharedMetadataReaderFactoryContextInitializer@3272} 2 = {ContextIdApplicationContextInitializer@3273} 3 = {ConfigurationWarningsApplicationContextInitializer@3274} 4 = {RSocketPortInfoApplicationContextInitializer@3275} 5 = {ServerPortInfoApplicationContextInitializer@3276} 6 = {ConditionEvaluationReportLoggingListener@3277}
1.2.4 SpringApplication.refreshContext
private void refreshContext(ConfigurableApplicationContext context) {
refresh(context);
if (this.registerShutdownHook) {
try {
//注册关闭虚拟机的钩子
context.registerShutdownHook();
}
catch (AccessControlException ex) {
// Not allowed in some environments.
}
}
}
protected void refresh(ApplicationContext applicationContext) {
Assert.isInstanceOf(AbstractApplicationContext.class, applicationContext);
((AbstractApplicationContext) applicationContext).refresh();
}
//AbstractApplicationContext.refresh
public void refresh() throws BeansException, IllegalStateException {
synchronized (this.startupShutdownMonitor) {
// Prepare this context for refreshing. //初始化当前容器的一些属性
prepareRefresh();
// Tell the subclass to refresh the internal bean factory. //设置工厂的序列化id
ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();
// Prepare the bean factory for use in this context.
//初始化beanFactory的一些属性，创建一些实例类，也注册了几个beanDefinition
//设置内容包括 beanClassLoader、StandardBeanExpressionResolver、ResourceEditorRegistrar、ApplicationContextAwareProcessor
//设置忽略的依赖接口EnvironmentAware、EmbeddedValueResolverAware、ResourceLoaderAware、ApplicationEventPublisherAware、MessageSourceAware、ApplicationContextAware
//注册BeanFactory（SpringApplication）、ResourceLoader(ConfigurableApplicationContext)、ApplicationEventPublisher（ConfigurableApplicationContext）、ApplicationContext（ConfigurableApplicationContext）
//追加beanPostProcessors：ApplicationListenerDetector
//管控environment、systemProperties、systemEnvironment单例
prepareBeanFactory(beanFactory);
try {
// Allows post-processing of the bean factory in context subclasses.
//设置一个WebApplicationContextServletContextAwareProcessor后置处理器
//设置忽略接口依赖ServletContextAware
//注册并实例化register和session的Scope，在注册过程中通过WebApplicationContextUtils.registerWebApplicationScopes(getBeanFactory());跳转到sprig-web中
//注册ServletRequest、ServletResponse、HttpSession、WebRequest的解析以来
//!!!注意，也就这里引入了对于spring-web的支持 （spring-boot通过spring-boot-starter..等是引入了spring-web的...）
//这里总结就是注册了spring-web相关的信息
postProcessBeanFactory(beanFactory);
// Invoke factory processors registered as beans in the context.
//先是收集beanFactory中直接已经注册好的BeanDefinitionRegistryPostProcessor，按registryProcessors、regularPostProcessors两种类别收集，在所有BeanDefinitionRegistryPostProcessor类后置执行方法最后执行，最后先执行按registryProcessors再执行regularPostProcessors
//然后从bean定义集合中找是BeanDefinitionRegistryPostProcessor类别，同时带PriorityOrdered标签的，实例化后执行后置方法
//再从bean定义集合中找是BeanDefinitionRegistryPostProcessor类别，同时带Ordered标签的，实例化后执行后置方法
//最后执行其余没有被实例化的BeanDefinitionRegistryPostProcessor，实例化并执行
//然后处理BeanFactoryPostProcessor类别
//按PriorityOrdered、Ordered、其他来收集并实例化BeanFactoryPostProcessor
//之后是分别排序和执行PriorityOrdered、Ordered、其他 类别的BeanFactoryPostProcessor
invokeBeanFactoryPostProcessors(beanFactory);
// Register bean processors that intercept bean creation.
//处理BeanPostProcessor，按PriorityOrdered、Ordered、其他来收集并实例化和执行
registerBeanPostProcessors(beanFactory);
// Initialize message source for this context.
//如果有名为messageSource的bean以它作为上下文里的messageSource，否则新建一个DelegatingMessageSource注册单例，并以它作为messageSource
initMessageSource();
// Initialize event multicaster for this context.
//如果有名为applicationEventMulticaster的bean以它作为上下文的applicationEventMulticaster，否则新建一个SimpleApplicationEventMulticaster注册单例，并以它作为applicationEventMulticaster
initApplicationEventMulticaster();
// Initialize other special beans in specific context subclasses.
//如果有名为themeSource的bean以它作为web抽象层级的themeSource，否则新建一个
//找容器里的ServletWebServerFactory（这里找到的是tomcatServletWebServerFactory），把它实例化并通过这个工厂创建webServer（这部分还是用spring-boot里的TomcatServletWebServerFactory）
//（！！！后续可以深入一下这里，看一下如何创建一个内嵌的tomcat，以及如何以代码的角度来理解这个tomcat容器）
//创建完毕后，更新对应PropertySource
onRefresh();
// Check for listener beans and register them.
//拿到applicationEventMulticaster，把之前收录的applicationListeners注册上（注册实例）
//并且从bean容器中找ApplicationListener类别的bean定义，也注册上（注册beanName）
//拿到earlyApplicationEvents，广播事件
registerListeners();
// Instantiate all remaining (non-lazy-init) singletons.
//看（1.2.4.1）的源码解读，bean实例化部分并没有深入
finishBeanFactoryInitialization(beanFactory);
// Last step: publish corresponding event.
//清理临时缓存
//如果有名为lifecycleProcessor的bean以它作为上下文的lifecycleProcessor，否则创建一个DefaultLifecycleProcessor，并执行startBeans方法；标记其running=true
//发布一个ContextRefreshedEvent事件
//处理了一个spring.liveBeansView.mbeanDomain相关服务（这里没理解）
//启动webServer
finishRefresh();
}
catch (BeansException ex) {
if (logger.isWarnEnabled()) {
logger.warn("Exception encountered during context initialization - " +
"cancelling refresh attempt: " + ex);
}
// Destroy already created singletons to avoid dangling resources.
destroyBeans();
// Reset 'active' flag.
cancelRefresh(ex);
// Propagate exception to caller.
throw ex;
}
finally {
// Reset common introspection caches in Spring's core, since we
// might not ever need metadata for singleton beans anymore...
resetCommonCaches();
}
}
}
1.2.4.1 AbstractApplicationContext.finishBeanFactoryInitialization
源码如下：
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/**
* Finish the initialization of this context's bean factory,
* initializing all remaining singleton beans.
*/
protected void finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory) {
// Initialize conversion service for this context.
if (beanFactory.containsBean(CONVERSION_SERVICE_BEAN_NAME) &&
beanFactory.isTypeMatch(CONVERSION_SERVICE_BEAN_NAME, ConversionService.class)) {
beanFactory.setConversionService(
beanFactory.getBean(CONVERSION_SERVICE_BEAN_NAME, ConversionService.class));
}
// Register a default embedded value resolver if no bean post-processor
// (such as a PropertyPlaceholderConfigurer bean) registered any before:
// at this point, primarily for resolution in annotation attribute values.
if (!beanFactory.hasEmbeddedValueResolver()) {
beanFactory.addEmbeddedValueResolver(strVal -> getEnvironment().resolvePlaceholders(strVal));
}
// Initialize LoadTimeWeaverAware beans early to allow for registering their transformers early.
//如果有对应bean定义，【先】创建一个LoadTimeWeaverAware的bean
String[] weaverAwareNames = beanFactory.getBeanNamesForType(LoadTimeWeaverAware.class, false, false);
for (String weaverAwareName : weaverAwareNames) {
getBean(weaverAwareName);
}
// Stop using the temporary ClassLoader for type matching.
//清空临时的类加载器
beanFactory.setTempClassLoader(null);
// Allow for caching all bean definition metadata, not expecting further changes.
//这里的意思是冻结beanDefinition，不预期后面还有beanDefinition相关改动
beanFactory.freezeConfiguration();
// Instantiate all remaining (non-lazy-init) singletons.
//实例化所有有beanDefinition定义但是尚未实例化的bean（具体参见1.2.4.2）
beanFactory.preInstantiateSingletons();
}
1.2.4.2 DefaultListableBeanFactory.preInstantiateSingletons
大部分的bean实例化就是在这个环节，细节非常复杂，这里并没有深入
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public void preInstantiateSingletons() throws BeansException {
if (logger.isTraceEnabled()) {
logger.trace("Pre-instantiating singletons in " + this);
}
// Iterate over a copy to allow for init methods which in turn register new bean definitions.
// While this may not be part of the regular factory bootstrap, it does otherwise work fine.
List<String> beanNames = new ArrayList<>(this.beanDefinitionNames);
// Trigger initialization of all non-lazy singleton beans...
for (String beanName : beanNames) {
RootBeanDefinition bd = getMergedLocalBeanDefinition(beanName);
if (!bd.isAbstract() && bd.isSingleton() && !bd.isLazyInit()) {
if (isFactoryBean(beanName)) {
Object bean = getBean(FACTORY_BEAN_PREFIX + beanName);
if (bean instanceof FactoryBean) {
final FactoryBean<?> factory = (FactoryBean<?>) bean;
boolean isEagerInit;
if (System.getSecurityManager() != null && factory instanceof SmartFactoryBean) {
isEagerInit = AccessController.doPrivileged((PrivilegedAction<Boolean>)
((SmartFactoryBean<?>) factory)::isEagerInit,
getAccessControlContext());
}
else {
isEagerInit = (factory instanceof SmartFactoryBean &&
((SmartFactoryBean<?>) factory).isEagerInit());
}
if (isEagerInit) {
getBean(beanName);
}
}
}
else {
//这里的实现非常复杂
//创建bean的实际过程（后续专门开章节再深入吧）
//比如bean依赖（dependsOn）、bean实例化时的后置处理（InstantiationAwareBeanPostProcessor）等都是在这里面完成
getBean(beanName);
}
}
}
1.2.5 默认的关闭钩子
钩子注册是通过
x
private void refreshContext(ConfigurableApplicationContext context) {
refresh(context);
if (this.registerShutdownHook) {
try {
context.registerShutdownHook(); //注册钩子
}
catch (AccessControlException ex) {
// Not allowed in some environments.
}
}
}
具体代码为：（只是定义了一个独立线程，在执行结束时才进行调度）
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@Override
public void registerShutdownHook() {
if (this.shutdownHook == null) {
// No shutdown hook registered yet.
this.shutdownHook = new Thread(SHUTDOWN_HOOK_THREAD_NAME) {
@Override
public void run() {
synchronized (startupShutdownMonitor) {
doClose();
}
}
};
Runtime.getRuntime().addShutdownHook(this.shutdownHook);
}
}
具体代码如下，注意注释里说的 “Called by both {@code close()} and a JVM shutdown hook, if any.”
x
/**
* Actually performs context closing: publishes a ContextClosedEvent and
* destroys the singletons in the bean factory of this application context.
* <p>Called by both {@code close()} and a JVM shutdown hook, if any.
* @see org.springframework.context.event.ContextClosedEvent
* @see #destroyBeans()
* @see #close()
* @see #registerShutdownHook()
*/
protected void doClose() {
// Check whether an actual close attempt is necessary...
if (this.active.get() && this.closed.compareAndSet(false, true)) { //断点是走不到这里的..
if (logger.isDebugEnabled()) {
logger.debug("Closing " + this);
}
LiveBeansView.unregisterApplicationContext(this);
try {
// Publish shutdown event.
//发布一个ContextClosedEvent事件
publishEvent(new ContextClosedEvent(this));
}
catch (Throwable ex) {
logger.warn("Exception thrown from ApplicationListener handling ContextClosedEvent", ex);
}
// Stop all Lifecycle beans, to avoid delays during individual destruction.
if (this.lifecycleProcessor != null) {
try {
//这里貌似是通过生命周期管理停掉所有在执行的bean （TODO 生命周期管理机制是啥?）,并设置lifecycleProcessor.running=false
this.lifecycleProcessor.onClose();
}
catch (Throwable ex) {
logger.warn("Exception thrown from LifecycleProcessor on context close", ex);
}
}
// Destroy all cached singletons in the context's BeanFactory.
//销毁所有beanFactory中缓存的单例bean
destroyBeans();
//销毁beanFactory工厂
// Close the state of this context itself.
closeBeanFactory();
// Let subclasses do some final clean-up if they wish...
onClose();
// Reset local application listeners to pre-refresh state.
if (this.earlyApplicationListeners != null) {
this.applicationListeners.clear();
this.applicationListeners.addAll(this.earlyApplicationListeners);
}
// Switch to inactive.
this.active.set(false);
}
}
1.3 启动日志分析
1.3.1 虚拟机启动日志打印
日志显示：
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Connected to the target VM, address: '127.0.0.1:59163', transport: 'socket'
1.3.2 Banner打印
日志显示：
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. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.5.RELEASE)
打印相关代码：
Banner printedBanner = printBanner(environment);
堆栈：
run:310, SpringApplication (org.springframework.boot)
run:1226, SpringApplication (org.springframework.boot)
run:1215, SpringApplication (org.springframework.boot)
main:11, DemoApplication (com.example.demo)
1.3.3 环境信息打印
日志显示：
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2020-03-20 11:26:35.800 INFO 22748 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication on WIN-89EHFNGT2HI with PID 22748 (D:\workspace_gw\code\demo-simple-web\target\classes started by Administrator in D:\workspace_gw\code\demo-simple-web)
2020-03-20 11:26:35.803 INFO 22748 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
打印相关代码：
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if (this.logStartupInfo) {
logStartupInfo(context.getParent() == null);
logStartupProfileInfo(context);
}
堆栈
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prepareContext:373, SpringApplication (org.springframework.boot)
run:314, SpringApplication (org.springframework.boot)
run:1226, SpringApplication (org.springframework.boot)
run:1215, SpringApplication (org.springframework.boot)
main:11, DemoApplication (com.example.demo)
1.3.4 web服务启动日志
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2020-03-20 11:33:27.604 INFO 8740 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-03-20 11:33:27.661 INFO 8740 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-03-20 11:33:27.663 INFO 8740 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.31]
2020-03-20 11:33:28.328 INFO 8740 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-03-20 11:33:28.329 INFO 8740 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 15341 ms
打印相关方法：
createWebServer();
堆栈：
onRefresh:153, ServletWebServerApplicationContext (org.springframework.boot.web.servlet.context)
refresh:544, AbstractApplicationContext (org.springframework.context.support)
refresh:141, ServletWebServerApplicationContext (org.springframework.boot.web.servlet.context)
refresh:747, SpringApplication (org.springframework.boot)
refreshContext:397, SpringApplication (org.springframework.boot)
run:315, SpringApplication (org.springframework.boot)
run:1226, SpringApplication (org.springframework.boot)
run:1215, SpringApplication (org.springframework.boot)
main:11, DemoApplication (com.example.demo)
1.3.5 实例化相关信息打印
这里只是默认spring-boot-web的一个实例的打印
日志显示：
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2020-03-20 11:36:29.536 INFO 21876 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
打印相关方法：
x
if (logger.isInfoEnabled()) {
logger.info("Initializing ExecutorService" + (this.beanName != null ? " '" + this.beanName + "'" : ""));
}
堆栈：
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initialize:181, ExecutorConfigurationSupport (org.springframework.scheduling.concurrent)
afterPropertiesSet:173, ExecutorConfigurationSupport (org.springframework.scheduling.concurrent)
invokeInitMethods:1855, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
initializeBean:1792, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
doCreateBean:595, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
createBean:517, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
lambda$doGetBean$0:323, AbstractBeanFactory (org.springframework.beans.factory.support)
getObject:-1, 124734309 (org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$143)
getSingleton:222, DefaultSingletonBeanRegistry (org.springframework.beans.factory.support)
doGetBean:321, AbstractBeanFactory (org.springframework.beans.factory.support)
getBean:202, AbstractBeanFactory (org.springframework.beans.factory.support)
configureAsyncSupport:211, WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter (org.springframework.boot.autoconfigure.web.servlet)
configureAsyncSupport:67, WebMvcConfigurerComposite (org.springframework.web.servlet.config.annotation)
configureAsyncSupport:68, DelegatingWebMvcConfiguration (org.springframework.web.servlet.config.annotation)
requestMappingHandlerAdapter:626, WebMvcConfigurationSupport (org.springframework.web.servlet.config.annotation)
requestMappingHandlerAdapter:369, WebMvcAutoConfiguration$EnableWebMvcConfiguration (org.springframework.boot.autoconfigure.web.servlet)
invoke0:-1, NativeMethodAccessorImpl (sun.reflect)
invoke:62, NativeMethodAccessorImpl (sun.reflect)
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:498, Method (java.lang.reflect)
instantiate:154, SimpleInstantiationStrategy (org.springframework.beans.factory.support)
instantiate:651, ConstructorResolver (org.springframework.beans.factory.support)
instantiateUsingFactoryMethod:636, ConstructorResolver (org.springframework.beans.factory.support)
instantiateUsingFactoryMethod:1338, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
createBeanInstance:1177, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
doCreateBean:557, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
createBean:517, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
lambda$doGetBean$0:323, AbstractBeanFactory (org.springframework.beans.factory.support)
getObject:-1, 124734309 (org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$143)
getSingleton:222, DefaultSingletonBeanRegistry (org.springframework.beans.factory.support)
doGetBean:321, AbstractBeanFactory (org.springframework.beans.factory.support)
getBean:202, AbstractBeanFactory (org.springframework.beans.factory.support)
preInstantiateSingletons:879, DefaultListableBeanFactory (org.springframework.beans.factory.support)
finishBeanFactoryInitialization:878, AbstractApplicationContext (org.springframework.context.support)
refresh:550, AbstractApplicationContext (org.springframework.context.support)
refresh:141, ServletWebServerApplicationContext (org.springframework.boot.web.servlet.context)
refresh:747, SpringApplication (org.springframework.boot)
refreshContext:397, SpringApplication (org.springframework.boot)
run:315, SpringApplication (org.springframework.boot)
run:1226, SpringApplication (org.springframework.boot)
run:1215, SpringApplication (org.springframework.boot)
main:11, DemoApplication (com.example.demo)
1.3.6 web启动打印
日志显示：
xxxxxxxxxx
2020-03-20 11:37:38.186 INFO 21876 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
相关方法：
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if (webServer != null) {
webServer.start();
}
堆栈：
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startWebServer:297, ServletWebServerApplicationContext (org.springframework.boot.web.servlet.context)
finishRefresh:163, ServletWebServerApplicationContext (org.springframework.boot.web.servlet.context)
refresh:553, AbstractApplicationContext (org.springframework.context.support)
refresh:141, ServletWebServerApplicationContext (org.springframework.boot.web.servlet.context)
refresh:747, SpringApplication (org.springframework.boot)
refreshContext:397, SpringApplication (org.springframework.boot)
run:315, SpringApplication (org.springframework.boot)
run:1226, SpringApplication (org.springframework.boot)
run:1215, SpringApplication (org.springframework.boot)
main:11, DemoApplication (com.example.demo)
1.3.7 启动成功日志
日志显示：
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2020-03-20 11:38:06.446 INFO 21876 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 168.106 seconds (JVM running for 178.556)
相关代码：
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if (this.logStartupInfo) {
new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), stopWatch);
}
堆栈：
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run:321, SpringApplication (org.springframework.boot)
run:1226, SpringApplication (org.springframework.boot)
run:1215, SpringApplication (org.springframework.boot)
main:11, DemoApplication (com.example.demo)
