Spring boot auto configuration with dependency and without @ComponentScan

Question

Spring boot provides @ComponentScan to find packages to be scanned.

I am building a library which has @RestControllers inside with package com

Answer 1

Spring boot starter are special artifacts designed by Spring and used by Spring.
You can check that in the source code that contains mainly a
spring.provides file :

provides: spring-boot-actuator,micrometer-core

I don't know the exact way to process in the same way as Spring Boot Starter but as probably acceptable workaround, you could define in your jar a @Configuration class that specifies @ComponentScan("com.mylib").

 @Configuration
 @ComponentScan("com.mylib")
 public class MyLibConfig {
     //...
 }

In this way, clients of the jar need "only" to import the @Configuration class :

@Import(MyLibConfig.class)
@Configuration
public class ClientConfig{
  //...
}