Avoid reflection on OptionalValidatorFactoryBean

Closes gh-28939

Author: snicoll

spring-messaging/src/main/java/org/springframework/messaging/simp/config/AbstractMessageBrokerConfiguration.java

@@ -22,7 +22,6 @@
 import java.util.List;
 import java.util.Map;
 
-import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.BeanInitializationException;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.ApplicationContext;
@@ -71,6 +70,7 @@
 import org.springframework.util.StringUtils;
 import org.springframework.validation.Errors;
 import org.springframework.validation.Validator;
+import org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean;
 
 /**
  * Provides essential configuration for handling messages with simple messaging
@@ -550,15 +550,12 @@ protected Validator simpValidator() {
 				validator = this.applicationContext.getBean(MVC_VALIDATOR_NAME, Validator.class);
 			}
 			else if (ClassUtils.isPresent("jakarta.validation.Validator", getClass().getClassLoader())) {
-				Class<?> clazz;
 				try {
-					String className = "org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean";
-					clazz = ClassUtils.forName(className, AbstractMessageBrokerConfiguration.class.getClassLoader());
+					validator = new OptionalValidatorFactoryBean();
 				}
 				catch (Throwable ex) {
-					throw new BeanInitializationException("Could not find default validator class", ex);
+					throw new BeanInitializationException("Failed to create default validator", ex);
 				}
-				validator = (Validator) BeanUtils.instantiateClass(clazz);
 			}
 			else {
 				validator = new Validator() {

spring-webflux/src/main/java/org/springframework/web/reactive/config/WebFluxConfigurationSupport.java

@@ -22,7 +22,6 @@
 
 import reactor.core.publisher.Mono;
 
-import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.BeanInitializationException;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.ApplicationContext;
@@ -45,6 +44,7 @@
 import org.springframework.validation.Errors;
 import org.springframework.validation.MessageCodesResolver;
 import org.springframework.validation.Validator;
+import org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean;
 import org.springframework.web.bind.WebDataBinder;
 import org.springframework.web.bind.annotation.WebAnnotationsRuntimeHintsRegistrar;
 import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
@@ -388,15 +388,12 @@ public Validator webFluxValidator() {
 		Validator validator = getValidator();
 		if (validator == null) {
 			if (ClassUtils.isPresent("jakarta.validation.Validator", getClass().getClassLoader())) {
-				Class<?> clazz;
 				try {
-					String name = "org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean";
-					clazz = ClassUtils.forName(name, getClass().getClassLoader());
+					validator = new OptionalValidatorFactoryBean();
 				}
-				catch (ClassNotFoundException | LinkageError ex) {
-					throw new BeanInitializationException("Failed to resolve default validator class", ex);
+				catch (Throwable ex) {
+					throw new BeanInitializationException("Failed to create default validator", ex);
 				}
-				validator = (Validator) BeanUtils.instantiateClass(clazz);
 			}
 			else {
 				validator = new NoOpValidator();

spring-webmvc/src/main/java/org/springframework/web/servlet/config/annotation/WebMvcConfigurationSupport.java

@@ -25,7 +25,6 @@
 
 import jakarta.servlet.ServletContext;
 
-import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.BeanFactoryUtils;
 import org.springframework.beans.factory.BeanInitializationException;
 import org.springframework.beans.factory.annotation.Qualifier;
@@ -68,6 +67,7 @@
 import org.springframework.validation.Errors;
 import org.springframework.validation.MessageCodesResolver;
 import org.springframework.validation.Validator;
+import org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean;
 import org.springframework.web.HttpRequestHandler;
 import org.springframework.web.accept.ContentNegotiationManager;
 import org.springframework.web.bind.WebDataBinder;
@@ -760,15 +760,12 @@ public Validator mvcValidator() {
 		Validator validator = getValidator();
 		if (validator == null) {
 			if (ClassUtils.isPresent("jakarta.validation.Validator", getClass().getClassLoader())) {
-				Class<?> clazz;
 				try {
-					String className = "org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean";
-					clazz = ClassUtils.forName(className, WebMvcConfigurationSupport.class.getClassLoader());
+					validator = new OptionalValidatorFactoryBean();
 				}
-				catch (ClassNotFoundException | LinkageError ex) {
-					throw new BeanInitializationException("Failed to resolve default validator class", ex);
+				catch (Throwable ex) {
+					throw new BeanInitializationException("Failed to create default validator", ex);
 				}
-				validator = (Validator) BeanUtils.instantiateClass(clazz);
 			}
 			else {
 				validator = new NoOpValidator();