Prevent early initialization of binding in ValidationAutoConfiguration

This commit replaces the use of ConfigurationProperties in
ValidationAutoConfiguration by an explicit environment check, as it
was already the case for the spring.aop.proxy-target-class property.

Closes gh-45618

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.java

@@ -27,7 +27,6 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnResource;
 import org.springframework.boot.autoconfigure.condition.SearchStrategy;
-import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.validation.MessageInterpolatorFactory;
 import org.springframework.boot.validation.beanvalidation.FilteredMethodValidationPostProcessor;
 import org.springframework.boot.validation.beanvalidation.MethodValidationExcludeFilter;
@@ -51,7 +50,6 @@ import org.springframework.validation.beanvalidation.MethodValidationPostProcess
 @AutoConfiguration
 @ConditionalOnClass(ExecutableValidator.class)
 @ConditionalOnResource(resources = "classpath:META-INF/services/jakarta.validation.spi.ValidationProvider")
-@EnableConfigurationProperties(ValidationProperties.class)
 @Import(PrimaryDefaultValidatorPostProcessor.class)
 public class ValidationAutoConfiguration {
 
@@ -71,13 +69,14 @@ public class ValidationAutoConfiguration {
 	@Bean
 	@ConditionalOnMissingBean(search = SearchStrategy.CURRENT)
 	public static MethodValidationPostProcessor methodValidationPostProcessor(Environment environment,
-			ValidationProperties validationProperties, ObjectProvider<Validator> validator,
-			ObjectProvider<MethodValidationExcludeFilter> excludeFilters) {
+			ObjectProvider<Validator> validator, ObjectProvider<MethodValidationExcludeFilter> excludeFilters) {
 		FilteredMethodValidationPostProcessor processor = new FilteredMethodValidationPostProcessor(
 				excludeFilters.orderedStream());
 		boolean proxyTargetClass = environment.getProperty("spring.aop.proxy-target-class", Boolean.class, true);
 		processor.setProxyTargetClass(proxyTargetClass);
-		processor.setAdaptConstraintViolations(validationProperties.getMethod().isAdaptConstraintViolations());
+		boolean adaptConstraintViolations = environment
+			.getProperty("spring.validation.method.adapt-constraint-violations", Boolean.class, false);
+		processor.setAdaptConstraintViolations(adaptConstraintViolations);
 		processor.setValidatorProvider(validator);
 		return processor;
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/validation/ValidationProperties.java

@@ -1,64 +0,0 @@
-/*
- * Copyright 2012-2025 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.boot.autoconfigure.validation;
-
-import org.springframework.beans.factory.config.BeanDefinition;
-import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.context.annotation.Role;
-
-/**
- * {@link ConfigurationProperties @ConfigurationProperties} for validation.
- *
- * @author Yanming Zhou
- * @author Andy Wilkinson
- * @since 3.5.0
- */
-@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
-@ConfigurationProperties("spring.validation")
-public class ValidationProperties {
-
-	private Method method = new Method();
-
-	public Method getMethod() {
-		return this.method;
-	}
-
-	public void setMethod(Method method) {
-		this.method = method;
-	}
-
-	/**
-	 * Method validation properties.
-	 */
-	public static class Method {
-
-		/**
-		 * Whether to adapt ConstraintViolations to MethodValidationResult.
-		 */
-		private boolean adaptConstraintViolations;
-
-		public boolean isAdaptConstraintViolations() {
-			return this.adaptConstraintViolations;
-		}
-
-		public void setAdaptConstraintViolations(boolean adaptConstraintViolations) {
-			this.adaptConstraintViolations = adaptConstraintViolations;
-		}
-
-	}
-
-}

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -2861,6 +2861,12 @@
       "name": "spring.thymeleaf.suffix",
       "defaultValue": ".html"
     },
+    {
+      "name": "spring.validation.method.adapt-constraint-violations",
+      "type": "java.lang.Boolean",
+      "description": "Whether to adapt ConstraintViolations to MethodValidationResult.",
+      "defaultValue": false
+    },
     {
       "name": "spring.webflux.hiddenmethod.filter.enabled",
       "type": "java.lang.Boolean",

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/validation/ValidationAutoConfigurationTests.java

@@ -221,6 +221,14 @@ class ValidationAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void validationUseDefaultAdaptToConstraintViolationsValue() {
+		this.contextRunner.withUserConfiguration(AnotherSampleServiceConfiguration.class).run((context) -> {
+			MethodValidationPostProcessor postProcessor = context.getBean(MethodValidationPostProcessor.class);
+			assertThat(postProcessor).hasFieldOrPropertyWithValue("adaptConstraintViolations", false);
+		});
+	}
+
 	@Test
 	@SuppressWarnings("unchecked")
 	void userDefinedMethodValidationPostProcessorTakesPrecedence() {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/validation/ValidationPropertiesTests.java

@@ -1,38 +0,0 @@
-/*
- * Copyright 2012-2025 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.boot.autoconfigure.validation;
-
-import org.junit.jupiter.api.Test;
-
-import org.springframework.validation.beanvalidation.MethodValidationPostProcessor;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-/**
- * Tests for {@link ValidationProperties}.
- *
- * @author Andy Wilkinson
- */
-class ValidationPropertiesTests {
-
-	@Test
-	void adaptConstraintViolationsPropertyDefaultMatchesPostProcessorDefault() {
-		assertThat(new MethodValidationPostProcessor()).extracting("adaptConstraintViolations")
-			.isEqualTo(new ValidationProperties().getMethod().isAdaptConstraintViolations());
-	}
-
-}