[bdHolder!=null]
Opt
Property:DefaultBeanDefinitionDocumentReader
BeanDefinitionReaderUtil:BeanDefinitionReaderUtils
readerContext:XmlReaderContext
delegate:BeanDefinitionParserDelegate
Bean 标签的解析及注册时序图
4:fireComponentRegistered(new BeanComponentDefinition(bdHolder))
2: bdHolder:BeanDefinitionHolder
1.1: parseBeanDefinitionElement(ele)
1.2: bdHolder:BeanDefinitionHolder
