>org.springframework.context.support.ClassPathXmlApplicationContext
  >org.springframework.context.support.ClassPathXmlApplicationContext#ClassPathXmlApplicationContext(java.lang.String[], boolean, org.springframework.context.ApplicationContext)
    >org.springframework.context.support.AbstractRefreshableConfigApplicationContext#setConfigLocations
      >org.springframework.context.support.AbstractRefreshableConfigApplicationContext#resolvePath
        >org.springframework.context.support.AbstractApplicationContext#getEnvironment
          >org.springframework.context.support.AbstractApplicationContext#createEnvironment 
            >org.springframework.core.env.StandardEnvironment  //加载默认环境信息
        >org.springframework.core.env.AbstractEnvironment#resolveRequiredPlaceholders  实现类：org.springframework.core.env.AbstractPropertyResolver#resolveRequiredPlaceholders
          >org.springframework.core.env.AbstractPropertyResolver#createPlaceholderHelper    
            >org.springframework.util.PropertyPlaceholderHelper
          >org.springframework.core.env.AbstractPropertyResolver#doResolvePlaceholders
            >org.springframework.util.PropertyPlaceholderHelper#replacePlaceholders(java.lang.String, org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver)
              >org.springframework.util.PropertyPlaceholderHelper#parseStringValue  --META-INF/spring/dubbo-demo-provider.xml

    >org.springframework.context.support.AbstractApplicationContext#refresh
      >org.springframework.context.support.AbstractApplicationContext#prepareRefresh  // Prepare this context for refreshing.
      >org.springframework.context.support.AbstractApplicationContext#obtainFreshBeanFactory
        >org.springframework.context.support.AbstractRefreshableApplicationContext#createBeanFactory
            >org.springframework.beans.factory.support.DefaultListableBeanFactory#DefaultListableBeanFactory(org.springframework.beans.factory.BeanFactory)
        >org.springframework.context.support.AbstractRefreshableApplicationContext#customizeBeanFactory XX
        >org.springframework.context.support.AbstractXmlApplicationContext#loadBeanDefinitions(org.springframework.beans.factory.support.DefaultListableBeanFactory)
          >org.springframework.beans.factory.xml.XmlBeanDefinitionReader#XmlBeanDefinitionReader
            >org.springframework.beans.factory.support.AbstractBeanDefinitionReader#AbstractBeanDefinitionReader  this.resourceLoader = new PathMatchingResourcePatternResolver(); 
          >org.springframework.context.support.AbstractXmlApplicationContext#initBeanDefinitionReader
          >org.springframework.context.support.AbstractXmlApplicationContext#loadBeanDefinitions(org.springframework.beans.factory.xml.XmlBeanDefinitionReader)
            >org.springframework.context.support.AbstractRefreshableConfigApplicationContext#getConfigLocations
          >org.springframework.beans.factory.support.AbstractBeanDefinitionReader#loadBeanDefinitions(java.lang.String...)  
      >org.springframework.context.support.AbstractRefreshableApplicationContext#getBeanFactory 
      >org.springframework.context.support.AbstractApplicationContext#prepareBeanFactory
        >org.springframework.context.support.ApplicationContextAwareProcessor#ApplicationContextAwareProcessor
          >org.springframework.beans.factory.config.EmbeddedValueResolver
            >org.springframework.beans.factory.config.BeanExpressionContext
      >org.springframework.context.support.AbstractApplicationContext#invokeBeanFactoryPostProcessors
      >org.springframework.context.support.AbstractApplicationContext#registerBeanPostProcessors
      >org.springframework.context.support.AbstractApplicationContext#initMessageSource
      >org.springframework.context.support.AbstractApplicationContext#initApplicationEventMulticaster  //单利多列注册