diff --git a/module/spring-boot-webflux/src/main/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfiguration.java b/module/spring-boot-webflux/src/main/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfiguration.java
index f06694403cc..d19f3a49b06 100644
--- a/module/spring-boot-webflux/src/main/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfiguration.java
+++ b/module/spring-boot-webflux/src/main/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfiguration.java
@@ -25,6 +25,9 @@ import org.apache.commons.logging.LogFactory;
 import org.jspecify.annotations.Nullable;
 import reactor.core.publisher.Mono;
 
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.TypeReference;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
@@ -308,6 +311,7 @@ public final class WebFluxAutoConfiguration {
 	 */
 	@Configuration(proxyBeanMethods = false)
 	@EnableConfigurationProperties({ WebProperties.class, ServerProperties.class })
+	@ImportRuntimeHints(WebFluxValidatorRuntimeHints.class)
 	static class EnableWebFluxConfiguration extends DelegatingWebFluxConfiguration {
 
 		private final WebFluxProperties webFluxProperties;
@@ -452,4 +456,14 @@ public final class WebFluxAutoConfiguration {
 
 	}
 
+	static class WebFluxValidatorRuntimeHints implements RuntimeHintsRegistrar {
+
+		@Override
+		public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
+			hints.reflection()
+				.registerType(TypeReference.of("org.springframework.boot.validation.autoconfigure.ValidatorAdapter"));
+		}
+
+	}
+
 }
diff --git a/module/spring-boot-webflux/src/test/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfigurationTests.java b/module/spring-boot-webflux/src/test/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfigurationTests.java
index 7ca7f5ea8a3..43084d0f1c4 100644
--- a/module/spring-boot-webflux/src/test/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfigurationTests.java
+++ b/module/spring-boot-webflux/src/test/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfigurationTests.java
@@ -46,6 +46,8 @@ import org.junit.jupiter.params.provider.ValueSource;
 import reactor.core.publisher.Mono;
 
 import org.springframework.aop.support.AopUtils;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration;
 import org.springframework.boot.http.codec.CodecCustomizer;
@@ -59,6 +61,7 @@ import org.springframework.boot.web.context.reactive.ReactiveWebApplicationConte
 import org.springframework.boot.web.server.autoconfigure.ServerProperties;
 import org.springframework.boot.web.server.reactive.MockReactiveWebServerFactory;
 import org.springframework.boot.webflux.autoconfigure.WebFluxAutoConfiguration.WebFluxConfig;
+import org.springframework.boot.webflux.autoconfigure.WebFluxAutoConfiguration.WebFluxValidatorRuntimeHints;
 import org.springframework.boot.webflux.autoconfigure.WebFluxAutoConfigurationTests.OrderedControllerAdviceBeansConfiguration.HighestOrderedControllerAdvice;
 import org.springframework.boot.webflux.autoconfigure.WebFluxAutoConfigurationTests.OrderedControllerAdviceBeansConfiguration.LowestOrderedControllerAdvice;
 import org.springframework.boot.webflux.filter.OrderedHiddenHttpMethodFilter;
@@ -907,6 +910,13 @@ class WebFluxAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void registersRuntimeHintsForValidatorCreation() {
+		RuntimeHints hints = new RuntimeHints();
+		new WebFluxValidatorRuntimeHints().registerHints(hints, getClass().getClassLoader());
+		assertThat(RuntimeHintsPredicates.reflection().onType(ValidatorAdapter.class)).accepts(hints);
+	}
+
 	private ContextConsumer<ReactiveWebApplicationContext> assertExchangeWithSession(
 			Consumer<MockServerWebExchange> exchange) {
 		return (context) -> {
diff --git a/module/spring-boot-webmvc/src/main/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfiguration.java b/module/spring-boot-webmvc/src/main/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfiguration.java
index 28e042fb836..da1e334a302 100644
--- a/module/spring-boot-webmvc/src/main/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfiguration.java
+++ b/module/spring-boot-webmvc/src/main/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfiguration.java
@@ -28,6 +28,9 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.jspecify.annotations.Nullable;
 
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.aot.hint.TypeReference;
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
@@ -435,6 +438,7 @@ public final class WebMvcAutoConfiguration {
 	 */
 	@Configuration(proxyBeanMethods = false)
 	@EnableConfigurationProperties(WebProperties.class)
+	@ImportRuntimeHints(MvcValidatorRuntimeHints.class)
 	static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration implements ResourceLoaderAware {
 
 		private final Resources resourceProperties;
@@ -724,4 +728,14 @@ public final class WebMvcAutoConfiguration {
 
 	}
 
+	static class MvcValidatorRuntimeHints implements RuntimeHintsRegistrar {
+
+		@Override
+		public void registerHints(RuntimeHints hints, @Nullable ClassLoader classLoader) {
+			hints.reflection()
+				.registerType(TypeReference.of("org.springframework.boot.validation.autoconfigure.ValidatorAdapter"));
+		}
+
+	}
+
 }
diff --git a/module/spring-boot-webmvc/src/test/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfigurationTests.java b/module/spring-boot-webmvc/src/test/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfigurationTests.java
index 362228a292c..38c329ca428 100644
--- a/module/spring-boot-webmvc/src/test/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfigurationTests.java
+++ b/module/spring-boot-webmvc/src/test/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfigurationTests.java
@@ -45,6 +45,8 @@ import org.junit.jupiter.api.Test;
 import org.mockito.InOrder;
 
 import org.springframework.aop.support.AopUtils;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration;
 import org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration;
@@ -64,6 +66,7 @@ import org.springframework.boot.web.server.servlet.ServletWebServerFactory;
 import org.springframework.boot.web.server.servlet.context.AnnotationConfigServletWebServerApplicationContext;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.boot.web.servlet.ServletRegistrationBean;
+import org.springframework.boot.webmvc.autoconfigure.WebMvcAutoConfiguration.MvcValidatorRuntimeHints;
 import org.springframework.boot.webmvc.autoconfigure.WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter;
 import org.springframework.boot.webmvc.autoconfigure.WebMvcAutoConfigurationTests.OrderedControllerAdviceBeansConfiguration.HighestOrderedControllerAdvice;
 import org.springframework.boot.webmvc.autoconfigure.WebMvcAutoConfigurationTests.OrderedControllerAdviceBeansConfiguration.LowestOrderedControllerAdvice;
@@ -1137,6 +1140,13 @@ class WebMvcAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void registersRuntimeHintsForValidatorCreation() {
+		RuntimeHints hints = new RuntimeHints();
+		new MvcValidatorRuntimeHints().registerHints(hints, getClass().getClassLoader());
+		assertThat(RuntimeHintsPredicates.reflection().onType(ValidatorAdapter.class)).accepts(hints);
+	}
+
 	private void assertResourceHttpRequestHandler(AssertableWebApplicationContext context,
 			Consumer<ResourceHttpRequestHandler> handlerConsumer) {
 		Map<String, Object> handlerMap = getHandlerMap(context.getBean("resourceHandlerMapping", HandlerMapping.class));