Add runtime hints for MethodValidationPostProcessor

Closes gh-28689

spring-context/src/main/java/org/springframework/validation/beanvalidation/MethodValidationPostProcessor.java

@@ -28,6 +28,7 @@ import org.springframework.aop.support.DefaultPointcutAdvisor;
 import org.springframework.aop.support.annotation.AnnotationMatchingPointcut;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.validation.annotation.Validated;
@@ -57,6 +58,7 @@ import org.springframework.validation.annotation.Validated;
  * @see jakarta.validation.executable.ExecutableValidator
  */
 @SuppressWarnings("serial")
+@ImportRuntimeHints(MethodValidationRuntimeHintsRegistrar.class)
 public class MethodValidationPostProcessor extends AbstractBeanFactoryAwareAdvisingPostProcessor
 		implements InitializingBean {
 

spring-context/src/main/java/org/springframework/validation/beanvalidation/MethodValidationRuntimeHintsRegistrar.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.validation.beanvalidation;
+
+import jakarta.validation.Validator;
+
+import org.springframework.aop.SpringProxy;
+import org.springframework.aop.framework.Advised;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.core.DecoratingProxy;
+import org.springframework.lang.Nullable;
+
+/**
+ * {@link RuntimeHintsRegistrar} implementation that registers proxy entries
+ * for {@link MethodValidationPostProcessor}.
+ *
+ * @author Sebastien Deleuze
+ * @since 6.0
+ */
+public class MethodValidationRuntimeHintsRegistrar implements RuntimeHintsRegistrar {
+
+	@Override
+	public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
+		hints.proxies().registerJdkProxy(Validator.class, SpringProxy.class, Advised.class, DecoratingProxy.class);
+	}
+}