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According to the Spring docs, to enable autodetection of annotated controllers, you add component scanning to your configuration:
<context:component-scan base-package="org.springframework.samples.petclinic.web"/>
My question is, why is this necessary?
If a Controller has an annotation to already indicate what it is, shouldn’t that be enough for Spring without component scanning?
How else would Spring find the classes? If you haven’t told Spring to look in a certain class or package, those classes aren’t going to get loaded, and Spring is never going to find them.
This is more a limitation of the java classloading model (if you can call it a limitation), then it is a limitation of Spring.