Add default web handling of method validation errors

Closes gh-30644

spring-web/src/main/java/org/springframework/web/method/annotation/HandlerMethodValidationException.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2002-2023 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.web.method.annotation;
+
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.Locale;
+
+import org.springframework.context.MessageSource;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.beanvalidation.MethodValidationResult;
+import org.springframework.validation.beanvalidation.ParameterValidationResult;
+import org.springframework.web.server.ResponseStatusException;
+import org.springframework.web.util.BindErrorUtils;
+
+/**
+ * {@link ResponseStatusException} that is also {@link MethodValidationResult}.
+ * Raised by {@link HandlerMethodValidator} in case of method validation errors
+ * on a web controller method.
+ *
+ * <p>The {@link #getStatusCode()} is 400 for input validation errors, and 500
+ * for validation errors on a return value.
+ *
+ * @author Rossen Stoyanchev
+ * @since 6.1
+ */
+@SuppressWarnings("serial")
+public class HandlerMethodValidationException extends ResponseStatusException implements MethodValidationResult {
+
+	private final MethodValidationResult validationResult;
+
+
+	public HandlerMethodValidationException(MethodValidationResult validationResult) {
+		super(initHttpStatus(validationResult), "Validation failure", null, null, null);
+		this.validationResult = validationResult;
+	}
+
+	private static HttpStatus initHttpStatus(MethodValidationResult validationResult) {
+		return (!validationResult.isForReturnValue() ? HttpStatus.BAD_REQUEST : HttpStatus.INTERNAL_SERVER_ERROR);
+	}
+
+
+	@Override
+	public Object[] getDetailMessageArguments(MessageSource messageSource, Locale locale) {
+		return new Object[] { BindErrorUtils.resolveAndJoin(getAllErrors(), messageSource, locale) };
+	}
+
+	@Override
+	public Object[] getDetailMessageArguments() {
+		return new Object[] { BindErrorUtils.resolveAndJoin(getAllErrors()) };
+	}
+
+	@Override
+	public Object getTarget() {
+		return this.validationResult.getTarget();
+	}
+
+	@Override
+	public Method getMethod() {
+		return this.validationResult.getMethod();
+	}
+
+	@Override
+	public boolean isForReturnValue() {
+		return this.validationResult.isForReturnValue();
+	}
+
+	@Override
+	public List<ParameterValidationResult> getAllValidationResults() {
+		return this.validationResult.getAllValidationResults();
+	}
+
+}

spring-web/src/main/java/org/springframework/web/method/annotation/HandlerMethodValidator.java

@@ -27,7 +27,6 @@ import org.springframework.lang.Nullable;
 import org.springframework.validation.BindingResult;
 import org.springframework.validation.MessageCodesResolver;
 import org.springframework.validation.beanvalidation.MethodValidationAdapter;
-import org.springframework.validation.beanvalidation.MethodValidationException;
 import org.springframework.validation.beanvalidation.MethodValidationResult;
 import org.springframework.validation.beanvalidation.MethodValidator;
 import org.springframework.validation.beanvalidation.ParameterErrors;
@@ -91,7 +90,7 @@ public final class HandlerMethodValidator implements MethodValidator {
 			}
 		}
 
-		throw new MethodValidationException(result);
+		throw new HandlerMethodValidationException(result);
 	}
 
 	@Override
@@ -109,7 +108,7 @@ public final class HandlerMethodValidator implements MethodValidator {
 
 		MethodValidationResult result = validateReturnValue(target, method, returnType, returnValue, groups);
 		if (result.hasErrors()) {
-			throw new MethodValidationException(result);
+			throw new HandlerMethodValidationException(result);
 		}
 	}