Spring advanced source code notes: Spring Bean creation process comprehensive analysis of the accompanying code implementation!

• The key point analysis by the timing of the beginning, we knew Bean create sub-process entry AbstractApplicationContext#refresh()method finishBeanFactoryInitialization(beanFactory)at
  
• enterfinishBeanFactoryInitialization

• Continue to enter DefaultListableBeanFactorythe preInstantiateSingletons method of the class , we find the following part of the code, see the factory Bean or ordinary Bean , and finally getBeanget the instance through the method

• Continuing to track down, we have entered AbstractBeanFactorythe doGetBean method of the class. There are a lot of codes in this method, and we directly find the core part

• Then enter AbstractAutowireCapableBeanFactorythe method of the class, find the following code part
  
• Enter the doCreateBean method to see, this method we focus on two key areas
• Create a Bean instance, the properties have not been set at this time

• Fill the Bean with attributes, call the initialization method, and apply the BeanPostProcessorpost processor
  

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