Allows for custom modification of an application context's bean definitions,
adapting the bean property values of the context's underlying bean factory.
Application contexts can auto-detect BeanFactoryPostProcessor beans in
their bean definitions and apply them before any other beans get created.
Useful for custom config files targeted at system administrators that
override bean properties configured in the application context.
See PropertyResourceConfigurer and its concrete implementations
for out-of-the-box solutions that address such configuration needs.
A BeanFactoryPostProcessor may interact with and modify bean
definitions, but never bean instances. Doing so may cause premature bean
instantiation, violating the container and causing unintended side-effects.
If bean instance interaction is required, consider implementing