Log warning if multiple @⁠RequestMapping annotations are declared

If multiple request mapping annotations are discovered, Spring MVC and
Spring WebFlux now log a warning similar to the following (without
newlines).

Multiple @⁠RequestMapping annotations found on
void org.example.MyController.put(), but only the first will be used:
[
@⁠org.springframework.web.bind.annotation.PutMapping(consumes={}, headers={}, name="", params={}, path={"/put"}, produces={}, value={"/put"}),
@⁠org.springframework.web.bind.annotation.PostMapping(consumes={}, headers={}, name="", params={}, path={"/put"}, produces={}, value={"/put"})
]

Closes gh-31962

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerMappingTests.java

@@ -40,7 +40,6 @@ import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PatchMapping;
 import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
@@ -363,7 +362,9 @@ class RequestMappingHandlerMappingTests {
 
 
 	@Controller
+	// gh-31962: The presence of multiple @RequestMappings is intentional.
 	@RequestMapping(consumes = MediaType.APPLICATION_JSON_VALUE)
+	@ExtraRequestMapping
 	static class ComposedAnnotationController {
 
 		@RequestMapping
@@ -382,7 +383,10 @@ class RequestMappingHandlerMappingTests {
 		public void post(@RequestBody(required = false) Foo foo) {
 		}
 
-		@PutMapping("/put")
+		// gh-31962: The presence of multiple @RequestMappings is intentional.
+		@PatchMapping("/put")
+		@RequestMapping(path = "/put", method = RequestMethod.PUT) // local @RequestMapping overrides meta-annotations
+		@PostMapping("/put")
 		public void put() {
 		}
 
@@ -396,6 +400,11 @@ class RequestMappingHandlerMappingTests {
 
 	}
 
+	@RequestMapping
+	@Target(ElementType.TYPE)
+	@Retention(RetentionPolicy.RUNTIME)
+	@interface ExtraRequestMapping {
+	}
 
 	@RequestMapping(method = RequestMethod.POST,
 			produces = MediaType.APPLICATION_JSON_VALUE,