Auto Configuration

Auto-Config¶

Starter project > spring.factories = listOfConfigClasses (which can be applied conditionally)
SpringApplication.run() > create AC, Loads:
Standard beans
Conditional-1(Is webApp)--> beans-1
Conditional-2 : beans-2
Notice this pattern
@Configuration Class-1 implements interface-1 >> Override method --> gives new bean.
this is sb config customization way.
public class MyWebConfig implements WebApplicationInitializer { onStartup(ServletContext servletContext) { ... } }
note: WebApplicationInitializer, provides spring way to configure ServletContext

create new Spring project, call it your starter.
Create Auto-configuration/s:
@Configuration Class-1 --> with Bean with conditions ,to enable/disable,
@Configuration Class-2 --> with Bean with conditions ,to enable/disable, ...
@Configuration Class-N --> with Bean with conditions ,to enable/disable
Register Auto-Configuration Classes
resource/META-INF/spring.factories=Class-1, Class-2, ... Class-N
DONE
Now package it and use it other project :

mvn clean package/install --> local Maven repo.
If want to exclude to Class-1:
@SpringBootApplication(exclude={Class-1})