Spring 5 Design Patterns

Customizing beans using a BeanPostProcessor

The BeanPostProcessor is an important extension point in Spring. It can modify bean instances in any way. It is used to enable a powerful feature such as the AOP proxy. You can write your own BeanPostProcessor in your application to create a custom post-processor--the class must implement the BeanPostProcessor interface. Spring provides several implementations of BeanPostProcessor. In Spring, the BeanPostProcessor interface has two callback methods, as follows:

    public interface BeanPostProcessor { 
      Object postProcessBeforeInitialization(Object bean, String       beanName) throws BeansException; 
      Object postProcessAfterInitialization(Object bean, String       beanName) throws BeansException; 
    } 

You can implement ...