SpringApplication.run(Application.class, args);
-->
　　public static ConfigurableApplicationContext run(Object source, String... args) {
　　　　return run(new Object[] { source }, args);
　　}
　　public static ConfigurableApplicationContext run(Object[] sources, String[] args) {
　　　　return new SpringApplication(sources).run(args);
　　}

 public void setInitializers(
   Collection<? extends ApplicationContextInitializer<?>> initializers) {
  this.initializers = new ArrayList<ApplicationContextInitializer<?>>();
  this.initializers.addAll(initializers);
 }

 private <T> Collection<? extends T> getSpringFactoriesInstances(Class<T> type,
   Class<?>[] parameterTypes, Object... args) {
  ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
  // Use names and ensure unique to protect against duplicates
  Set<String> names = new LinkedHashSet<String>(
    SpringFactoriesLoader.loadFactoryNames(type, classLoader));
  List<T> instances = createSpringFactoriesInstances(type, parameterTypes,
    classLoader, args, names);
  AnnotationAwareOrderComparator.sort(instances);
  return instances;
 }

private Class<?> deduceMainApplicationClass() {
  try {
   StackTraceElement[] stackTrace = new RuntimeException().getStackTrace();
   for (StackTraceElement stackTraceElement : stackTrace) {
    if ("main".equals(stackTraceElement.getMethodName())) {
     return Class.forName(stackTraceElement.getClassName());
    }
   }
  }
  catch (ClassNotFoundException ex) {
   // Swallow and continue
  }
  return null;
 }

# Run Listeners
org.springframework.boot.SpringApplicationRunListener=\
org.springframework.boot.context.event.EventPublishingRunListener
　　

 SpringApplicationRunListeners(Log log,
   Collection<? extends SpringApplicationRunListener> listeners) {
  this.log = log;
  this.listeners = new ArrayList<SpringApplicationRunListener>(listeners);
 }

 @Override
 public void started() {
  this.initialMulticaster
    .multicastEvent(new ApplicationStartedEvent(this.application, this.args));
 }

 private SpringApplicationRunListeners getRunListeners(String[] args) {
  Class<?>[] types = new Class<?>[] { SpringApplication.class, String[].class };
  return new SpringApplicationRunListeners(logger, getSpringFactoriesInstances(
    SpringApplicationRunListener.class, types, this, args));
 }

public EventPublishingRunListener(SpringApplication application, String[] args) {
  this.application = application;
  this.args = args;
  this.initialMulticaster = new SimpleApplicationEventMulticaster();
  for (ApplicationListener<?> listener : application.getListeners()) {
   this.initialMulticaster.addApplicationListener(listener);
  }
 }

executor.execute(new Runnable() {
     @Override
     public void run() {
      invokeListener(listener, event);
     }
    });

 @Override
 public void onApplicationEvent(ApplicationEvent event) {
  if (event instanceof ApplicationEnvironmentPreparedEvent) {
   onApplicationEnvironmentPreparedEvent(
     (ApplicationEnvironmentPreparedEvent) event);
  }
  if (event instanceof ApplicationPreparedEvent) {
   onApplicationPreparedEvent(event);
  }
 }

 public void environmentPrepared(ConfigurableEnvironment environment) {
  this.initialMulticaster.multicastEvent(new ApplicationEnvironmentPreparedEvent(
    this.application, this.args, environment));
 }

private FailureAnalysis analyze(Throwable failure, List<FailureAnalyzer> analyzers) {
  for (FailureAnalyzer analyzer : analyzers) {
   FailureAnalysis analysis = analyzer.analyze(failure);
   if (analysis != null) {
    return analysis;
   }
  }
  return null;
 }

 @Override
 protected FailureAnalysis analyze(Throwable rootFailure,
   NoSuchBeanDefinitionException cause, String description) {
  if (cause.getNumberOfBeansFound() != 0) {
   return null;
  }
  List<AutoConfigurationResult> autoConfigurationResults = getAutoConfigurationResults(
    cause);
  StringBuilder message = new StringBuilder();
  message.append(String.format("%s required %s that could not be found.%n",
    description == null ? "A component" : description,
    getBeanDescription(cause)));
  if (!autoConfigurationResults.isEmpty()) {
   for (AutoConfigurationResult provider : autoConfigurationResults) {
    message.append(String.format("\t- %s%n", provider));
   }
  }
  String action = String.format("Consider %s %s in your configuration.",
    (!autoConfigurationResults.isEmpty()
      ? "revisiting the conditions above or defining" : "defining"),
    getBeanDescription(cause));
  return new FailureAnalysis(message.toString(), action, cause);
 }

protected void logStartupInfo(boolean isRoot) {
  if (isRoot) {
   new StartupInfoLogger(this.mainApplicationClass)
     .logStarting(getApplicationLog());
  }
 }
 protected Log getApplicationLog() {
  if (this.mainApplicationClass == null) {
   return logger;
  }
  return LogFactory.getLog(this.mainApplicationClass);
 }
 public void logStarting(Log log) {
  Assert.notNull(log, "Log must not be null");
  if (log.isInfoEnabled()) {
   log.info(getStartupMessage());
  }
  if (log.isDebugEnabled()) {
   log.debug(getRunningMessage());
  }
 }
 protected void logStartupProfileInfo(ConfigurableApplicationContext context) {
  Log log = getApplicationLog();
  if (log.isInfoEnabled()) {
   String[] activeProfiles = context.getEnvironment().getActiveProfiles();
   if (ObjectUtils.isEmpty(activeProfiles)) {
    String[] defaultProfiles = context.getEnvironment().getDefaultProfiles();
    log.info("No active profile set, falling back to default profiles: "
      + StringUtils.arrayToCommaDelimitedString(defaultProfiles));
   }
   else {
    log.info("The following profiles are active: "
      + StringUtils.arrayToCommaDelimitedString(activeProfiles));
   }
  }
 }

 BeanDefinitionLoader(BeanDefinitionRegistry registry, Object... sources) {
    Assert.notNull(registry, "Registry must not be null");
    Assert.notEmpty(sources, "Sources must not be empty");
    this.sources = sources;
    this.annotatedReader = new AnnotatedBeanDefinitionReader(registry);
    this.xmlReader = new XmlBeanDefinitionReader(registry);
    if (isGroovyPresent()) {
      this.groovyReader = new GroovyBeanDefinitionReader(registry);
    }
    this.scanner = new ClassPathBeanDefinitionScanner(registry);
    this.scanner.addExcludeFilter(new ClassExcludeFilter(sources));
  }

 public int load() {
    int count = 0;
    for (Object source : this.sources) {
      count += load(source);
    }
    return count;
  }
  private int load(Object source) {
    Assert.notNull(source, "Source must not be null");
    if (source instanceof Class<?>) {
      return load((Class<?>) source);
    }
    if (source instanceof Resource) {
      return load((Resource) source);
    }
    if (source instanceof Package) {
      return load((Package) source);
    }
    if (source instanceof CharSequence) {
      return load((CharSequence) source);
    }
    throw new IllegalArgumentException("Invalid source type " + source.getClass());
  }

public void registerBean(Class<?> annotatedClass, String name, Class<? extends Annotation>... qualifiers) {
    AnnotatedGenericBeanDefinition abd = new AnnotatedGenericBeanDefinition(annotatedClass);
    if (this.conditionEvaluator.shouldSkip(abd.getMetadata())) {
      return;
    }
    ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(abd);
    abd.setScope(scopeMetadata.getScopeName());
    String beanName = (name != null ? name : this.beanNameGenerator.generateBeanName(abd, this.registry));
    AnnotationConfigUtils.processCommonDefinitionAnnotations(abd);
    if (qualifiers != null) {
      for (Class<? extends Annotation> qualifier : qualifiers) {
        if (Primary.class == qualifier) {
          abd.setPrimary(true);
        }
        else if (Lazy.class == qualifier) {
          abd.setLazyInit(true);
        }
        else {
          abd.addQualifier(new AutowireCandidateQualifier(qualifier));
        }
      }
    }
    BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(abd, beanName);
    definitionHolder = AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);
    BeanDefinitionReaderUtils.registerBeanDefinition(definitionHolder, this.registry);
  }

protected AbstractBeanDefinition(ConstructorArgumentValues cargs, MutablePropertyValues pvs) {
    setConstructorArgumentValues(cargs);
    setPropertyValues(pvs);
  }
  public StandardAnnotationMetadata(Class<?> introspectedClass, boolean nestedAnnotationsAsMap) {
    super(introspectedClass);
    this.annotations = introspectedClass.getAnnotations();
    this.nestedAnnotationsAsMap = nestedAnnotationsAsMap;
  }