Add base infra for Web controllers hints

See gh-28518

spring-web/src/main/java/org/springframework/http/MediaTypeResourceHintsRegistrar.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http;
+
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.lang.Nullable;
+
+/**
+ * {@link RuntimeHintsRegistrar} implementation that makes sure mime types
+ * are available in constrained environments.
+ *
+ * @author Stephane Nicoll
+ * @since 6.0
+ */
+class MediaTypeResourceHintsRegistrar implements RuntimeHintsRegistrar {
+
+	@Override
+	public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
+		hints.resources().registerPattern("org/springframework/http/mime.types");
+	}
+}

spring-web/src/main/java/org/springframework/web/bind/annotation/RequestMapping.java

@@ -22,6 +22,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.aot.hint.annotation.Reflective;
 import org.springframework.core.annotation.AliasFor;
 
 /**
@@ -72,6 +73,7 @@ import org.springframework.core.annotation.AliasFor;
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 @Mapping
+@Reflective(RequestMappingReflectiveProcessor.class)
 public @interface RequestMapping {
 
 	/**

spring-web/src/main/java/org/springframework/web/bind/annotation/RequestMappingReflectiveProcessor.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.bind.annotation;
+
+import java.lang.reflect.Method;
+
+import org.springframework.aot.hint.ReflectionHints;
+import org.springframework.aot.hint.annotation.ReflectiveProcessor;
+import org.springframework.aot.hint.annotation.SimpleReflectiveProcessor;
+
+/**
+ * {@link ReflectiveProcessor} implementation for {@link RequestMapping}
+ * annotated types. On top of registering reflection hints for invoking
+ * the annotated method, this implementation handles return types that
+ * are serialized as well as TBD.
+ *
+ * @author Stephane Nicoll
+ * @since 6.0
+ */
+class RequestMappingReflectiveProcessor extends SimpleReflectiveProcessor {
+
+	@Override
+	protected void registerMethodHint(ReflectionHints hints, Method method) {
+		super.registerMethodHint(hints, method);
+		// TODO
+	}
+}

spring-web/src/main/java/org/springframework/web/bind/annotation/WebAnnotationsRuntimeHintsRegistrar.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.bind.annotation;
+
+import java.util.stream.Stream;
+
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.support.RuntimeHintsUtils;
+import org.springframework.lang.Nullable;
+import org.springframework.stereotype.Controller;
+
+/**
+ * {@link RuntimeHintsRegistrar} implementation that make web binding
+ * annotations at runtime.
+ *
+ * @author Stephane Nicoll
+ * @since 6.0
+ */
+public final class WebAnnotationsRuntimeHintsRegistrar implements RuntimeHintsRegistrar {
+
+	@Override
+	public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
+		Stream.of(Controller.class, ControllerAdvice.class, CookieValue.class,
+				CrossOrigin.class, DeleteMapping.class, ExceptionHandler.class,
+				GetMapping.class, InitBinder.class, Mapping.class, MatrixVariable.class,
+				ModelAttribute.class, PatchMapping.class, PathVariable.class,
+				PostMapping.class, PutMapping.class, RequestAttribute.class,
+				RequestBody.class, RequestHeader.class, RequestMapping.class,
+				RequestParam.class, RequestPart.class, ResponseBody.class,
+				ResponseStatus.class, RestController.class, RestControllerAdvice.class,
+				SessionAttribute.class, SessionAttributes.class).forEach(
+				annotationType -> RuntimeHintsUtils.registerAnnotation(hints, annotationType));
+	}
+
+}