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One thing that felt weird to me about Spring Boot when I looked at it a year or so ago was the idea of enabling features based upon which libraries are on the classpath.

Has that turned out to be useful in practice? Seems like a simple method for unpleasant surprises.

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I've definitely been nabbed by unpleasant surprises while using it - when you have lots of transitive dependencies you can get some surprisingly interesting behaviour :)

That said, you can also be fairly granular about you configuration (instead of the auto-config), so it's not that bad.

You don't have to use them, but it's really great for getting started. You can fine tune these by excluding pieces you don't need to auto configured.

http://docs.spring.io/spring-boot/docs/current/reference/htm...

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