Predetermine validation groups on initialization

Closes gh-32068

Author: jhoeller

Diff for: spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -78,6 +78,8 @@ public class InvocableHandlerMethod extends HandlerMethod {
 	@Nullable
 	private MethodValidator methodValidator;
 
+	private Class<?>[] validationGroups = EMPTY_GROUPS;
+
 
 	/**
 	 * Create an instance from a {@code HandlerMethod}.
@@ -149,6 +151,8 @@ public void setDataBinderFactory(WebDataBinderFactory dataBinderFactory) {
 	 */
 	public void setMethodValidator(@Nullable MethodValidator methodValidator) {
 		this.methodValidator = methodValidator;
+		this.validationGroups = (methodValidator != null ?
+				methodValidator.determineValidationGroups(getBean(), getBridgedMethod()) : EMPTY_GROUPS);
 	}
 
 
@@ -180,17 +184,16 @@ public Object invokeForRequest(NativeWebRequest request, @Nullable ModelAndViewC
 			logger.trace("Arguments: " + Arrays.toString(args));
 		}
 
-		Class<?>[] groups = getValidationGroups();
 		if (shouldValidateArguments() && this.methodValidator != null) {
 			this.methodValidator.applyArgumentValidation(
-					getBean(), getBridgedMethod(), getMethodParameters(), args, groups);
+					getBean(), getBridgedMethod(), getMethodParameters(), args, this.validationGroups);
 		}
 
 		Object returnValue = doInvoke(args);
 
 		if (shouldValidateReturnValue() && this.methodValidator != null) {
 			this.methodValidator.applyReturnValueValidation(
-					getBean(), getBridgedMethod(), getReturnType(), returnValue, groups);
+					getBean(), getBridgedMethod(), getReturnType(), returnValue, this.validationGroups);
 		}
 
 		return returnValue;
@@ -238,11 +241,6 @@ protected Object[] getMethodArgumentValues(NativeWebRequest request, @Nullable M
 		return args;
 	}
 
-	private Class<?>[] getValidationGroups() {
-		return ((shouldValidateArguments() || shouldValidateReturnValue()) && this.methodValidator != null ?
-				this.methodValidator.determineValidationGroups(getBean(), getBridgedMethod()) : EMPTY_GROUPS);
-	}
-
 	/**
 	 * Invoke the handler method with the given argument values.
 	 */

Diff for: spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -87,6 +87,8 @@ public class InvocableHandlerMethod extends HandlerMethod {
 	@Nullable
 	private MethodValidator methodValidator;
 
+	private Class<?>[] validationGroups = EMPTY_GROUPS;
+
 
 	/**
 	 * Create an instance from a {@code HandlerMethod}.
@@ -151,6 +153,8 @@ public void setReactiveAdapterRegistry(ReactiveAdapterRegistry registry) {
 	 */
 	public void setMethodValidator(@Nullable MethodValidator methodValidator) {
 		this.methodValidator = methodValidator;
+		this.validationGroups = (methodValidator != null ?
+				methodValidator.determineValidationGroups(getBean(), getBridgedMethod()) : EMPTY_GROUPS);
 	}
 
 
@@ -166,10 +170,9 @@ public Mono<HandlerResult> invoke(
 			ServerWebExchange exchange, BindingContext bindingContext, Object... providedArgs) {
 
 		return getMethodArgumentValues(exchange, bindingContext, providedArgs).flatMap(args -> {
-			Class<?>[] groups = getValidationGroups();
 			if (shouldValidateArguments() && this.methodValidator != null) {
 				this.methodValidator.applyArgumentValidation(
-						getBean(), getBridgedMethod(), getMethodParameters(), args, groups);
+						getBean(), getBridgedMethod(), getMethodParameters(), args, this.validationGroups);
 			}
 			Object value;
 			Method method = getBridgedMethod();
@@ -262,11 +265,6 @@ private void logArgumentErrorIfNecessary(ServerWebExchange exchange, MethodParam
 		}
 	}
 
-	private Class<?>[] getValidationGroups() {
-		return ((shouldValidateArguments() || shouldValidateReturnValue()) && this.methodValidator != null ?
-				this.methodValidator.determineValidationGroups(getBean(), getBridgedMethod()) : EMPTY_GROUPS);
-	}
-
 	private static boolean isAsyncVoidReturnType(MethodParameter returnType, @Nullable ReactiveAdapter adapter) {
 		if (adapter != null && adapter.supportsEmpty()) {
 			if (adapter.isNoValue()) {