What Spring Boot Adds
What Boot changes about starting a Spring application, and how it decides what to create for you.
Plain Spring needs you to wire a DispatcherServlet, register it with a server, and configure everything else by hand. Spring Boot exists to make that setup disappear behind one dependency and one annotation. This topic is about how it actually decides what to create — the mechanism behind "it just works," which stops being magic the moment you can name the rule.
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