Prior to this commit, handler methods in Spring MVC controllers were not required to provide explicit path mappings via @RequestMapping (or any of its specializations such as @GetMapping). Such handler methods were effectively mapped to all paths. Consequently, developers may have unwittingly mapped all requests to a single handler method. This commit addresses this by enforcing that @RequestMapping methods are mapped to an explicit path. Note, however, that this is enforced after type-level and method-level @RequestMapping information has been merged. Developers wishing to map to all paths should now add an explicit path mapping to "/**" or "**". Closes gh-22543
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