I wrote a demo to hack the code. And I found when Spring Boot choosed what classes to be loaded, it would use a configuration file 'META-INF/spring-autoconfigure-metadata.properties', but I didn't find the file in the Spring Boot source code. So how does this file be generated ? Thank you !
Comment From: snicoll
There is an annotation processor that generates that file based on conditions in the module.
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Comment From: m4ra7h0n
I find it at org.springframework.boot:spring-boot-autoconfigure:xxx.jar