diff --git a/build.gradle b/build.gradle
index d21c458e1fcb..dc4cc1da1dcb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,10 +29,10 @@ configure(allprojects) { project ->
 		imports {
 			mavenBom "com.fasterxml.jackson:jackson-bom:2.12.6"
 			mavenBom "io.netty:netty-bom:4.1.75.Final"
-			mavenBom "io.projectreactor:reactor-bom:2020.0.17"
-			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR12"
-			mavenBom "io.rsocket:rsocket-bom:1.1.1"
-			mavenBom "org.eclipse.jetty:jetty-bom:9.4.45.v20220203"
+			mavenBom "io.projectreactor:reactor-bom:2020.0.18"
+			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR13"
+			mavenBom "io.rsocket:rsocket-bom:1.1.2"
+			mavenBom "org.eclipse.jetty:jetty-bom:9.4.46.v20220331"
 			mavenBom "org.jetbrains.kotlin:kotlin-bom:1.5.32"
 			mavenBom "org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.5.2"
 			mavenBom "org.jetbrains.kotlinx:kotlinx-serialization-bom:1.2.2"
@@ -96,7 +96,7 @@ configure(allprojects) { project ->
 
 			dependency "com.h2database:h2:2.1.210"
 			dependency "com.github.ben-manes.caffeine:caffeine:2.9.3"
-			dependency "com.github.librepdf:openpdf:1.3.26"
+			dependency "com.github.librepdf:openpdf:1.3.27"
 			dependency "com.rometools:rome:1.18.0"
 			dependency "commons-io:commons-io:2.5"
 			dependency "io.vavr:vavr:0.10.4"
@@ -128,18 +128,18 @@ configure(allprojects) { project ->
 			dependency "org.webjars:webjars-locator-core:0.48"
 			dependency "org.webjars:underscorejs:1.8.3"
 
-			dependencySet(group: 'org.apache.tomcat', version: '9.0.60') {
+			dependencySet(group: 'org.apache.tomcat', version: '9.0.62') {
 				entry 'tomcat-util'
 				entry('tomcat-websocket') {
 					exclude group: "org.apache.tomcat", name: "tomcat-servlet-api"
 					exclude group: "org.apache.tomcat", name: "tomcat-websocket-api"
 				}
 			}
-			dependencySet(group: 'org.apache.tomcat.embed', version: '9.0.60') {
+			dependencySet(group: 'org.apache.tomcat.embed', version: '9.0.62') {
 				entry 'tomcat-embed-core'
 				entry 'tomcat-embed-websocket'
 			}
-			dependencySet(group: 'io.undertow', version: '2.2.16.Final') {
+			dependencySet(group: 'io.undertow', version: '2.2.17.Final') {
 				entry 'undertow-core'
 				entry('undertow-servlet') {
 					exclude group: "org.jboss.spec.javax.servlet", name: "jboss-servlet-api_4.0_spec"
@@ -150,7 +150,7 @@ configure(allprojects) { project ->
 				}
 			}
 
-			dependency "org.eclipse.jetty:jetty-reactive-httpclient:1.1.10"
+			dependency "org.eclipse.jetty:jetty-reactive-httpclient:1.1.11"
 			dependency 'org.apache.httpcomponents.client5:httpclient5:5.1.3'
 			dependency 'org.apache.httpcomponents.core5:httpcore5-reactive:5.1.3'
 			dependency("org.apache.httpcomponents:httpclient:4.5.13") {
@@ -206,10 +206,10 @@ configure(allprojects) { project ->
 			}
 			dependency "io.mockk:mockk:1.12.1"
 
-			dependency("net.sourceforge.htmlunit:htmlunit:2.59.0") {
+			dependency("net.sourceforge.htmlunit:htmlunit:2.60.0") {
 				exclude group: "commons-logging", name: "commons-logging"
 			}
-			dependency("org.seleniumhq.selenium:htmlunit-driver:2.59.0") {
+			dependency("org.seleniumhq.selenium:htmlunit-driver:2.60.0") {
 				exclude group: "commons-logging", name: "commons-logging"
 			}
 			dependency("org.seleniumhq.selenium:selenium-java:3.141.59") {
@@ -340,7 +340,7 @@ configure([rootProject] + javaProjects) { project ->
 	}
 
 	checkstyle {
-		toolVersion = "9.3"
+		toolVersion = "10.1"
 		configDirectory.set(rootProject.file("src/checkstyle"))
 	}
 
diff --git a/ci/images/ci-image/Dockerfile b/ci/images/ci-image/Dockerfile
index ac4db911a85f..37ab9b6edb47 100644
--- a/ci/images/ci-image/Dockerfile
+++ b/ci/images/ci-image/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:focal-20220302
+FROM ubuntu:focal-20220404
 
 ADD setup.sh /setup.sh
 ADD get-jdk-url.sh /get-jdk-url.sh
diff --git a/ci/images/get-jdk-url.sh b/ci/images/get-jdk-url.sh
index d090494f6627..3b0006dd7f6d 100755
--- a/ci/images/get-jdk-url.sh
+++ b/ci/images/get-jdk-url.sh
@@ -12,7 +12,7 @@ case "$1" in
 		 echo "https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.2%2B8/OpenJDK17U-jdk_x64_linux_hotspot_17.0.2_8.tar.gz"
   ;;
   java18)
-		 echo "https://github.com/adoptium/temurin18-binaries/releases/download/jdk18-2022-02-12-08-06-beta/OpenJDK18-jdk_x64_linux_hotspot_2022-02-12-08-06.tar.gz"
+		 echo "https://github.com/adoptium/temurin18-binaries/releases/download/jdk-18%2B36/OpenJDK18U-jdk_x64_linux_hotspot_18_36.tar.gz"
   ;;
   *)
 		echo $"Unknown java version"
diff --git a/ci/pipeline.yml b/ci/pipeline.yml
index eb8de81ea1e1..712bd2cac0de 100644
--- a/ci/pipeline.yml
+++ b/ci/pipeline.yml
@@ -41,6 +41,11 @@ anchors:
     GITHUB_TOKEN: ((github-ci-release-token))
 
 resource_types:
+- name: registry-image
+  type: registry-image
+  source:
+    repository: concourse/registry-image-resource
+    tag: 1.5.0
 - name: artifactory-resource
   type: registry-image
   source:
diff --git a/gradle.properties b/gradle.properties
index 75c9b894bcfa..00985a0fbeed 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-version=5.3.18-SNAPSHOT
+version=5.3.19
 org.gradle.jvmargs=-Xmx1536M
 org.gradle.caching=true
 org.gradle.parallel=true
diff --git a/spring-aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java b/spring-aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java
index f6f7bd7acfd6..08274272386a 100644
--- a/spring-aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java
+++ b/spring-aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java
@@ -134,7 +134,7 @@ static Class<?>[] completeProxiedInterfaces(AdvisedSupport advised, boolean deco
 				if (targetClass.isInterface()) {
 					advised.setInterfaces(targetClass);
 				}
-				else if (Proxy.isProxyClass(targetClass) || isLambda(targetClass)) {
+				else if (Proxy.isProxyClass(targetClass) || ClassUtils.isLambdaClass(targetClass)) {
 					advised.setInterfaces(targetClass.getInterfaces());
 				}
 				specifiedInterfaces = advised.getProxiedInterfaces();
@@ -245,18 +245,4 @@ static Object[] adaptArgumentsIfNecessary(Method method, @Nullable Object[] argu
 		return arguments;
 	}
 
-	/**
-	 * Determine if the supplied {@link Class} is a JVM-generated implementation
-	 * class for a lambda expression or method reference.
-	 * <p>This method makes a best-effort attempt at determining this, based on
-	 * checks that work on modern, main stream JVMs.
-	 * @param clazz the class to check
-	 * @return {@code true} if the class is a lambda implementation class
-	 * @since 5.3.16
-	 */
-	static boolean isLambda(Class<?> clazz) {
-		return (clazz.isSynthetic() && (clazz.getSuperclass() == Object.class) &&
-				(clazz.getInterfaces().length > 0) && clazz.getName().contains("$$Lambda"));
-	}
-
 }
diff --git a/spring-aop/src/main/java/org/springframework/aop/framework/CglibAopProxy.java b/spring-aop/src/main/java/org/springframework/aop/framework/CglibAopProxy.java
index 022cc0fddf24..87fa84d6b98a 100644
--- a/spring-aop/src/main/java/org/springframework/aop/framework/CglibAopProxy.java
+++ b/spring-aop/src/main/java/org/springframework/aop/framework/CglibAopProxy.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -375,6 +375,22 @@ private static boolean implementsInterface(Method method, Set<Class<?>> ifcs) {
 		return false;
 	}
 
+	/**
+	 * Invoke the given method with a CGLIB MethodProxy if possible, falling back
+	 * to a plain reflection invocation in case of a fast-class generation failure.
+	 */
+	@Nullable
+	private static Object invokeMethod(@Nullable Object target, Method method, Object[] args, MethodProxy methodProxy)
+			throws Throwable {
+		try {
+			return methodProxy.invoke(target, args);
+		}
+		catch (CodeGenerationException ex) {
+			CglibMethodInvocation.logFastClassGenerationFailure(method);
+			return AopUtils.invokeJoinpointUsingReflection(target, method, args);
+		}
+	}
+
 	/**
 	 * Process a return value. Wraps a return of {@code this} if necessary to be the
 	 * {@code proxy} and also verifies that {@code null} is not returned as a primitive.
@@ -425,7 +441,7 @@ public StaticUnadvisedInterceptor(@Nullable Object target) {
 		@Override
 		@Nullable
 		public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
-			Object retVal = methodProxy.invoke(this.target, args);
+			Object retVal = invokeMethod(this.target, method, args, methodProxy);
 			return processReturnType(proxy, this.target, method, retVal);
 		}
 	}
@@ -450,7 +466,7 @@ public Object intercept(Object proxy, Method method, Object[] args, MethodProxy
 			Object oldProxy = null;
 			try {
 				oldProxy = AopContext.setCurrentProxy(proxy);
-				Object retVal = methodProxy.invoke(this.target, args);
+				Object retVal = invokeMethod(this.target, method, args, methodProxy);
 				return processReturnType(proxy, this.target, method, retVal);
 			}
 			finally {
@@ -478,7 +494,7 @@ public DynamicUnadvisedInterceptor(TargetSource targetSource) {
 		public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
 			Object target = this.targetSource.getTarget();
 			try {
-				Object retVal = methodProxy.invoke(target, args);
+				Object retVal = invokeMethod(target, method, args, methodProxy);
 				return processReturnType(proxy, target, method, retVal);
 			}
 			finally {
@@ -508,7 +524,7 @@ public Object intercept(Object proxy, Method method, Object[] args, MethodProxy
 			Object target = this.targetSource.getTarget();
 			try {
 				oldProxy = AopContext.setCurrentProxy(proxy);
-				Object retVal = methodProxy.invoke(target, args);
+				Object retVal = invokeMethod(target, method, args, methodProxy);
 				return processReturnType(proxy, target, method, retVal);
 			}
 			finally {
@@ -685,13 +701,7 @@ public Object intercept(Object proxy, Method method, Object[] args, MethodProxy
 					// it does nothing but a reflective operation on the target, and no hot
 					// swapping or fancy proxying.
 					Object[] argsToUse = AopProxyUtils.adaptArgumentsIfNecessary(method, args);
-					try {
-						retVal = methodProxy.invoke(target, argsToUse);
-					}
-					catch (CodeGenerationException ex) {
-						CglibMethodInvocation.logFastClassGenerationFailure(method);
-						retVal = AopUtils.invokeJoinpointUsingReflection(target, method, argsToUse);
-					}
+					retVal = invokeMethod(target, method, argsToUse, methodProxy);
 				}
 				else {
 					// We need to create a method invocation...
diff --git a/spring-aop/src/main/java/org/springframework/aop/framework/DefaultAopProxyFactory.java b/spring-aop/src/main/java/org/springframework/aop/framework/DefaultAopProxyFactory.java
index 5f1acad9a9a2..e63e17212322 100644
--- a/spring-aop/src/main/java/org/springframework/aop/framework/DefaultAopProxyFactory.java
+++ b/spring-aop/src/main/java/org/springframework/aop/framework/DefaultAopProxyFactory.java
@@ -21,6 +21,7 @@
 
 import org.springframework.aop.SpringProxy;
 import org.springframework.core.NativeDetector;
+import org.springframework.util.ClassUtils;
 
 /**
  * Default {@link AopProxyFactory} implementation, creating either a CGLIB proxy
@@ -60,7 +61,7 @@ public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException
 				throw new AopConfigException("TargetSource cannot determine target class: " +
 						"Either an interface or a target is required for proxy creation.");
 			}
-			if (targetClass.isInterface() || Proxy.isProxyClass(targetClass) || AopProxyUtils.isLambda(targetClass)) {
+			if (targetClass.isInterface() || Proxy.isProxyClass(targetClass) || ClassUtils.isLambdaClass(targetClass)) {
 				return new JdkDynamicAopProxy(config);
 			}
 			return new ObjenesisCglibAopProxy(config);
diff --git a/spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractAutoProxyCreator.java b/spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractAutoProxyCreator.java
index 3e68f820ecb9..c550168800e4 100644
--- a/spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractAutoProxyCreator.java
+++ b/spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractAutoProxyCreator.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -50,6 +50,7 @@
 import org.springframework.core.SmartClassLoader;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -85,6 +86,7 @@
  * @author Juergen Hoeller
  * @author Rod Johnson
  * @author Rob Harrop
+ * @author Sam Brannen
  * @since 13.10.2003
  * @see #setInterceptorNames
  * @see #getAdvicesAndAdvisorsForBean
@@ -442,8 +444,8 @@ protected Object createProxy(Class<?> beanClass, @Nullable String beanName,
 		proxyFactory.copyFrom(this);
 
 		if (proxyFactory.isProxyTargetClass()) {
-			// Explicit handling of JDK proxy targets (for introduction advice scenarios)
-			if (Proxy.isProxyClass(beanClass)) {
+			// Explicit handling of JDK proxy targets and lambdas (for introduction advice scenarios)
+			if (Proxy.isProxyClass(beanClass) || ClassUtils.isLambdaClass(beanClass)) {
 				// Must allow for introductions; can't just set interfaces to the proxy's interfaces only.
 				for (Class<?> ifc : beanClass.getInterfaces()) {
 					proxyFactory.addInterface(ifc);
diff --git a/spring-aop/src/test/java/org/springframework/aop/framework/AopProxyUtilsTests.java b/spring-aop/src/test/java/org/springframework/aop/framework/AopProxyUtilsTests.java
index 3dbf550a1211..2704cf1c7c2f 100644
--- a/spring-aop/src/test/java/org/springframework/aop/framework/AopProxyUtilsTests.java
+++ b/spring-aop/src/test/java/org/springframework/aop/framework/AopProxyUtilsTests.java
@@ -19,7 +19,6 @@
 import java.lang.reflect.Proxy;
 import java.util.Arrays;
 import java.util.List;
-import java.util.function.Supplier;
 
 import org.junit.jupiter.api.Test;
 
@@ -134,61 +133,4 @@ public void testProxiedUserInterfacesWithNoInterface() {
 				AopProxyUtils.proxiedUserInterfaces(proxy));
 	}
 
-	@Test
-	void isLambda() {
-		assertIsLambda(AopProxyUtilsTests.staticLambdaExpression);
-		assertIsLambda(AopProxyUtilsTests::staticStringFactory);
-
-		assertIsLambda(this.instanceLambdaExpression);
-		assertIsLambda(this::instanceStringFactory);
-	}
-
-	@Test
-	void isNotLambda() {
-		assertIsNotLambda(new EnigmaSupplier());
-
-		assertIsNotLambda(new Supplier<String>() {
-			@Override
-			public String get() {
-				return "anonymous inner class";
-			}
-		});
-
-		assertIsNotLambda(new Fake$$LambdaSupplier());
-	}
-
-	private static void assertIsLambda(Supplier<String> supplier) {
-		assertThat(AopProxyUtils.isLambda(supplier.getClass())).isTrue();
-	}
-
-	private static void assertIsNotLambda(Supplier<String> supplier) {
-		assertThat(AopProxyUtils.isLambda(supplier.getClass())).isFalse();
-	}
-
-	private static final Supplier<String> staticLambdaExpression = () -> "static lambda expression";
-
-	private final Supplier<String> instanceLambdaExpression = () -> "instance lambda expressions";
-
-	private static String staticStringFactory() {
-		return "static string factory";
-	}
-
-	private String instanceStringFactory() {
-		return "instance string factory";
-	}
-
-	private static class EnigmaSupplier implements Supplier<String> {
-		@Override
-		public String get() {
-			return "enigma";
-		}
-	}
-
-	private static class Fake$$LambdaSupplier implements Supplier<String> {
-		@Override
-		public String get() {
-			return "fake lambda";
-		}
-	}
-
 }
diff --git a/spring-beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java b/spring-beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java
index 4187097ce371..8332045197de 100644
--- a/spring-beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java
+++ b/spring-beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java
@@ -287,13 +287,15 @@ private CachedIntrospectionResults(Class<?> beanClass) throws BeansException {
 			// This call is slow so we do it once.
 			PropertyDescriptor[] pds = this.beanInfo.getPropertyDescriptors();
 			for (PropertyDescriptor pd : pds) {
-				if (Class.class == beanClass && (!"name".equals(pd.getName()) && !pd.getName().endsWith("Name"))) {
+				if (Class.class == beanClass && !("name".equals(pd.getName()) ||
+						(pd.getName().endsWith("Name") && String.class == pd.getPropertyType()))) {
 					// Only allow all name variants of Class properties
 					continue;
 				}
-				if (pd.getPropertyType() != null && (ClassLoader.class.isAssignableFrom(pd.getPropertyType())
-						|| ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
-					// Ignore ClassLoader and ProtectionDomain types - nobody needs to bind to those
+				if (pd.getWriteMethod() == null && pd.getPropertyType() != null &&
+						(ClassLoader.class.isAssignableFrom(pd.getPropertyType()) ||
+								ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
+					// Ignore ClassLoader and ProtectionDomain read-only properties - no need to bind to those
 					continue;
 				}
 				if (logger.isTraceEnabled()) {
@@ -342,9 +344,10 @@ private void introspectInterfaces(Class<?> beanClass, Class<?> currClass, Set<St
 						// GenericTypeAwarePropertyDescriptor leniently resolves a set* write method
 						// against a declared read method, so we prefer read method descriptors here.
 						pd = buildGenericTypeAwarePropertyDescriptor(beanClass, pd);
-						if (pd.getPropertyType() != null && (ClassLoader.class.isAssignableFrom(pd.getPropertyType())
-								|| ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
-							// Ignore ClassLoader and ProtectionDomain types - nobody needs to bind to those
+						if (pd.getWriteMethod() == null && pd.getPropertyType() != null &&
+								(ClassLoader.class.isAssignableFrom(pd.getPropertyType()) ||
+										ProtectionDomain.class.isAssignableFrom(pd.getPropertyType()))) {
+							// Ignore ClassLoader and ProtectionDomain read-only properties - no need to bind to those
 							continue;
 						}
 						this.propertyDescriptors.put(pd.getName(), pd);
@@ -364,7 +367,7 @@ private void introspectPlainAccessors(Class<?> beanClass, Set<String> readMethod
 
 		for (Method method : beanClass.getMethods()) {
 			if (!this.propertyDescriptors.containsKey(method.getName()) &&
-					!readMethodNames.contains((method.getName())) && isPlainAccessor(method)) {
+					!readMethodNames.contains(method.getName()) && isPlainAccessor(method)) {
 				this.propertyDescriptors.put(method.getName(),
 						new GenericTypeAwarePropertyDescriptor(beanClass, method.getName(), method, null, null));
 				readMethodNames.add(method.getName());
@@ -373,8 +376,11 @@ private void introspectPlainAccessors(Class<?> beanClass, Set<String> readMethod
 	}
 
 	private boolean isPlainAccessor(Method method) {
-		if (method.getParameterCount() > 0 || method.getReturnType() == void.class ||
-				method.getDeclaringClass() == Object.class || Modifier.isStatic(method.getModifiers())) {
+		if (Modifier.isStatic(method.getModifiers()) ||
+				method.getDeclaringClass() == Object.class || method.getDeclaringClass() == Class.class ||
+				method.getParameterCount() > 0 || method.getReturnType() == void.class ||
+				ClassLoader.class.isAssignableFrom(method.getReturnType()) ||
+				ProtectionDomain.class.isAssignableFrom(method.getReturnType())) {
 			return false;
 		}
 		try {
diff --git a/spring-beans/src/main/java/org/springframework/beans/PropertyAccessor.java b/spring-beans/src/main/java/org/springframework/beans/PropertyAccessor.java
index 3a417aadcd37..03201a89d0d7 100644
--- a/spring-beans/src/main/java/org/springframework/beans/PropertyAccessor.java
+++ b/spring-beans/src/main/java/org/springframework/beans/PropertyAccessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -23,8 +23,9 @@
 
 /**
  * Common interface for classes that can access named properties
- * (such as bean properties of an object or fields in an object)
- * Serves as base interface for {@link BeanWrapper}.
+ * (such as bean properties of an object or fields in an object).
+ *
+ * <p>Serves as base interface for {@link BeanWrapper}.
  *
  * @author Juergen Hoeller
  * @since 1.1
diff --git a/spring-beans/src/test/java/org/springframework/beans/BeanWrapperTests.java b/spring-beans/src/test/java/org/springframework/beans/BeanWrapperTests.java
index 8856e31a0e05..ab154ea3c4e6 100644
--- a/spring-beans/src/test/java/org/springframework/beans/BeanWrapperTests.java
+++ b/spring-beans/src/test/java/org/springframework/beans/BeanWrapperTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -23,6 +23,8 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.testfixture.beans.TestBean;
+import org.springframework.core.OverridingClassLoader;
+import org.springframework.core.io.DefaultResourceLoader;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
@@ -105,7 +107,7 @@ void checkNotWritablePropertyHoldPossibleMatches() {
 			.satisfies(ex -> assertThat(ex.getPossibleMatches()).containsExactly("age"));
 	}
 
-	@Test // Can't be shared; there is no such thing as a read-only field
+	@Test  // Can't be shared; there is no such thing as a read-only field
 	void setReadOnlyMapProperty() {
 		TypedReadOnlyMap map = new TypedReadOnlyMap(Collections.singletonMap("key", new TestBean()));
 		TypedReadOnlyMapClient target = new TypedReadOnlyMapClient();
@@ -157,12 +159,34 @@ void propertyDescriptors() {
 		BeanWrapper accessor = createAccessor(target);
 		accessor.setPropertyValue("name", "a");
 		accessor.setPropertyValue("spouse.name", "b");
+
 		assertThat(target.getName()).isEqualTo("a");
 		assertThat(target.getSpouse().getName()).isEqualTo("b");
 		assertThat(accessor.getPropertyValue("name")).isEqualTo("a");
 		assertThat(accessor.getPropertyValue("spouse.name")).isEqualTo("b");
 		assertThat(accessor.getPropertyDescriptor("name").getPropertyType()).isEqualTo(String.class);
 		assertThat(accessor.getPropertyDescriptor("spouse.name").getPropertyType()).isEqualTo(String.class);
+
+		assertThat(accessor.isReadableProperty("class.package")).isFalse();
+		assertThat(accessor.isReadableProperty("class.module")).isFalse();
+		assertThat(accessor.isReadableProperty("class.classLoader")).isFalse();
+		assertThat(accessor.isReadableProperty("class.name")).isTrue();
+		assertThat(accessor.isReadableProperty("class.simpleName")).isTrue();
+		assertThat(accessor.getPropertyValue("class.name")).isEqualTo(TestBean.class.getName());
+		assertThat(accessor.getPropertyValue("class.simpleName")).isEqualTo(TestBean.class.getSimpleName());
+		assertThat(accessor.getPropertyDescriptor("class.name").getPropertyType()).isEqualTo(String.class);
+		assertThat(accessor.getPropertyDescriptor("class.simpleName").getPropertyType()).isEqualTo(String.class);
+
+		accessor = createAccessor(new DefaultResourceLoader());
+
+		assertThat(accessor.isReadableProperty("class.package")).isFalse();
+		assertThat(accessor.isReadableProperty("class.module")).isFalse();
+		assertThat(accessor.isReadableProperty("class.classLoader")).isFalse();
+		assertThat(accessor.isReadableProperty("classLoader")).isTrue();
+		assertThat(accessor.isWritableProperty("classLoader")).isTrue();
+		OverridingClassLoader ocl = new OverridingClassLoader(getClass().getClassLoader());
+		accessor.setPropertyValue("classLoader", ocl);
+		assertThat(accessor.getPropertyValue("classLoader")).isSameAs(ocl);
 	}
 
 	@Test
diff --git a/spring-context-support/src/test/java/org/springframework/validation/beanvalidation2/ValidatorFactoryTests.java b/spring-context-support/src/test/java/org/springframework/validation/beanvalidation2/ValidatorFactoryTests.java
index a383ae5f8bf7..ea2fb76ae882 100644
--- a/spring-context-support/src/test/java/org/springframework/validation/beanvalidation2/ValidatorFactoryTests.java
+++ b/spring-context-support/src/test/java/org/springframework/validation/beanvalidation2/ValidatorFactoryTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -31,6 +31,7 @@
 import javax.validation.Constraint;
 import javax.validation.ConstraintValidator;
 import javax.validation.ConstraintValidatorContext;
+import javax.validation.ConstraintValidatorFactory;
 import javax.validation.ConstraintViolation;
 import javax.validation.Payload;
 import javax.validation.Valid;
@@ -43,6 +44,7 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.core.convert.support.DefaultConversionService;
@@ -52,18 +54,18 @@
 import org.springframework.validation.FieldError;
 import org.springframework.validation.ObjectError;
 import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
+import org.springframework.validation.beanvalidation.SpringConstraintValidatorFactory;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * @author Juergen Hoeller
  */
-@SuppressWarnings("resource")
-public class ValidatorFactoryTests {
+class ValidatorFactoryTests {
 
 	@Test
-	@SuppressWarnings("cast")
-	public void testSimpleValidation() {
+	void simpleValidation() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -78,15 +80,15 @@ public void testSimpleValidation() {
 
 		Validator nativeValidator = validator.unwrap(Validator.class);
 		assertThat(nativeValidator.getClass().getName().startsWith("org.hibernate")).isTrue();
-		assertThat(validator.unwrap(ValidatorFactory.class) instanceof HibernateValidatorFactory).isTrue();
-		assertThat(validator.unwrap(HibernateValidatorFactory.class) instanceof HibernateValidatorFactory).isTrue();
+		assertThat(validator.unwrap(ValidatorFactory.class)).isInstanceOf(HibernateValidatorFactory.class);
+		assertThat(validator.unwrap(HibernateValidatorFactory.class)).isInstanceOf(HibernateValidatorFactory.class);
 
 		validator.destroy();
 	}
 
 	@Test
-	@SuppressWarnings("cast")
-	public void testSimpleValidationWithCustomProvider() {
+	void simpleValidationWithCustomProvider() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.setProviderClass(HibernateValidator.class);
 		validator.afterPropertiesSet();
@@ -102,14 +104,15 @@ public void testSimpleValidationWithCustomProvider() {
 
 		Validator nativeValidator = validator.unwrap(Validator.class);
 		assertThat(nativeValidator.getClass().getName().startsWith("org.hibernate")).isTrue();
-		assertThat(validator.unwrap(ValidatorFactory.class) instanceof HibernateValidatorFactory).isTrue();
-		assertThat(validator.unwrap(HibernateValidatorFactory.class) instanceof HibernateValidatorFactory).isTrue();
+		assertThat(validator.unwrap(ValidatorFactory.class)).isInstanceOf(HibernateValidatorFactory.class);
+		assertThat(validator.unwrap(HibernateValidatorFactory.class)).isInstanceOf(HibernateValidatorFactory.class);
 
 		validator.destroy();
 	}
 
 	@Test
-	public void testSimpleValidationWithClassLevel() {
+	void simpleValidationWithClassLevel() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -122,10 +125,13 @@ public void testSimpleValidationWithClassLevel() {
 		ConstraintViolation<?> cv = iterator.next();
 		assertThat(cv.getPropertyPath().toString()).isEqualTo("");
 		assertThat(cv.getConstraintDescriptor().getAnnotation() instanceof NameAddressValid).isTrue();
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testSpringValidationFieldType() {
+	void springValidationFieldType() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -135,11 +141,16 @@ public void testSpringValidationFieldType() {
 		BeanPropertyBindingResult errors = new BeanPropertyBindingResult(person, "person");
 		validator.validate(person, errors);
 		assertThat(errors.getErrorCount()).isEqualTo(1);
-		assertThat(errors.getFieldError("address").getRejectedValue()).isInstanceOf(ValidAddress.class);
+		assertThat(errors.getFieldError("address").getRejectedValue())
+				.as("Field/Value type mismatch")
+				.isInstanceOf(ValidAddress.class);
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testSpringValidation() {
+	void springValidation() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -164,10 +175,13 @@ public void testSpringValidation() {
 		assertThat(errorCodes.contains("NotNull.street")).isTrue();
 		assertThat(errorCodes.contains("NotNull.java.lang.String")).isTrue();
 		assertThat(errorCodes.contains("NotNull")).isTrue();
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testSpringValidationWithClassLevel() {
+	void springValidationWithClassLevel() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -182,10 +196,12 @@ public void testSpringValidationWithClassLevel() {
 		assertThat(errorCodes.size()).isEqualTo(2);
 		assertThat(errorCodes.contains("NameAddressValid.person")).isTrue();
 		assertThat(errorCodes.contains("NameAddressValid")).isTrue();
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testSpringValidationWithAutowiredValidator() {
+	void springValidationWithAutowiredValidator() {
 		ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext(
 				LocalValidatorFactoryBean.class);
 		LocalValidatorFactoryBean validator = ctx.getBean(LocalValidatorFactoryBean.class);
@@ -202,11 +218,14 @@ public void testSpringValidationWithAutowiredValidator() {
 		assertThat(errorCodes.size()).isEqualTo(2);
 		assertThat(errorCodes.contains("NameAddressValid.person")).isTrue();
 		assertThat(errorCodes.contains("NameAddressValid")).isTrue();
+
+		validator.destroy();
 		ctx.close();
 	}
 
 	@Test
-	public void testSpringValidationWithErrorInListElement() {
+	void springValidationWithErrorInListElement() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -221,10 +240,13 @@ public void testSpringValidationWithErrorInListElement() {
 		assertThat(fieldError.getField()).isEqualTo("address.street");
 		fieldError = result.getFieldError("addressList[0].street");
 		assertThat(fieldError.getField()).isEqualTo("addressList[0].street");
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testSpringValidationWithErrorInSetElement() {
+	void springValidationWithErrorInSetElement() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -239,10 +261,13 @@ public void testSpringValidationWithErrorInSetElement() {
 		assertThat(fieldError.getField()).isEqualTo("address.street");
 		fieldError = result.getFieldError("addressSet[].street");
 		assertThat(fieldError.getField()).isEqualTo("addressSet[].street");
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testInnerBeanValidation() {
+	void innerBeanValidation() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -251,10 +276,13 @@ public void testInnerBeanValidation() {
 		validator.validate(mainBean, errors);
 		Object rejected = errors.getFieldValue("inner.value");
 		assertThat(rejected).isNull();
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testValidationWithOptionalField() {
+	void validationWithOptionalField() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -263,10 +291,13 @@ public void testValidationWithOptionalField() {
 		validator.validate(mainBean, errors);
 		Object rejected = errors.getFieldValue("inner.value");
 		assertThat(rejected).isNull();
+
+		validator.destroy();
 	}
 
 	@Test
-	public void testListValidation() {
+	void listValidation() {
+		@SuppressWarnings("resource")
 		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
 		validator.afterPropertiesSet();
 
@@ -282,6 +313,34 @@ public void testListValidation() {
 		assertThat(fieldError).isNotNull();
 		assertThat(fieldError.getRejectedValue()).isEqualTo("X");
 		assertThat(errors.getFieldValue("list[1]")).isEqualTo("X");
+
+		validator.destroy();
+	}
+
+	@Test
+	void withConstraintValidatorFactory() {
+		ConstraintValidatorFactory cvf = new SpringConstraintValidatorFactory(new DefaultListableBeanFactory());
+
+		@SuppressWarnings("resource")
+		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
+		validator.setConstraintValidatorFactory(cvf);
+		validator.afterPropertiesSet();
+
+		assertThat(validator.getConstraintValidatorFactory()).isSameAs(cvf);
+		validator.destroy();
+	}
+
+	@Test
+	void withCustomInitializer() {
+		ConstraintValidatorFactory cvf = new SpringConstraintValidatorFactory(new DefaultListableBeanFactory());
+
+		@SuppressWarnings("resource")
+		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
+		validator.setConfigurationInitializer(configuration -> configuration.constraintValidatorFactory(cvf));
+		validator.afterPropertiesSet();
+
+		assertThat(validator.getConstraintValidatorFactory()).isSameAs(cvf);
+		validator.destroy();
 	}
 
 
@@ -380,8 +439,8 @@ public boolean isValid(ValidPerson value, ConstraintValidatorContext context) {
 			}
 			boolean valid = (value.name == null || !value.address.street.contains(value.name));
 			if (!valid && "Phil".equals(value.name)) {
-				context.buildConstraintViolationWithTemplate(
-						context.getDefaultConstraintMessageTemplate()).addPropertyNode("address").addConstraintViolation().disableDefaultConstraintViolation();
+				context.buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate())
+						.addPropertyNode("address").addConstraintViolation().disableDefaultConstraintViolation();
 			}
 			return valid;
 		}
@@ -417,6 +476,7 @@ public static class InnerBean {
 		public String getValue() {
 			return value;
 		}
+
 		public void setValue(String value) {
 			this.value = value;
 		}
@@ -425,8 +485,8 @@ public void setValue(String value) {
 
 	@Retention(RetentionPolicy.RUNTIME)
 	@Target(ElementType.FIELD)
-	@Constraint(validatedBy=InnerValidator.class)
-	public static @interface InnerValid {
+	@Constraint(validatedBy = InnerValidator.class)
+	public @interface InnerValid {
 
 		String message() default "NOT VALID";
 
@@ -446,7 +506,8 @@ public void initialize(InnerValid constraintAnnotation) {
 		public boolean isValid(InnerBean bean, ConstraintValidatorContext context) {
 			context.disableDefaultConstraintViolation();
 			if (bean.getValue() == null) {
-				context.buildConstraintViolationWithTemplate("NULL").addPropertyNode("value").addConstraintViolation();
+				context.buildConstraintViolationWithTemplate("NULL")
+						.addPropertyNode("value").addConstraintViolation();
 				return false;
 			}
 			return true;
@@ -494,7 +555,8 @@ public boolean isValid(List<String> list, ConstraintValidatorContext context) {
 			boolean valid = true;
 			for (int i = 0; i < list.size(); i++) {
 				if ("X".equals(list.get(i))) {
-					context.buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate()).addBeanNode().inIterable().atIndex(i).addConstraintViolation();
+					context.buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate())
+							.addBeanNode().inIterable().atIndex(i).addConstraintViolation();
 					valid = false;
 				}
 			}
diff --git a/spring-context/src/main/java/org/springframework/validation/DataBinder.java b/spring-context/src/main/java/org/springframework/validation/DataBinder.java
index 612dfc5622a2..8ee5e43b02fe 100644
--- a/spring-context/src/main/java/org/springframework/validation/DataBinder.java
+++ b/spring-context/src/main/java/org/springframework/validation/DataBinder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -51,18 +51,20 @@
 import org.springframework.util.StringUtils;
 
 /**
- * Binder that allows for setting property values onto a target object,
- * including support for validation and binding result analysis.
- * The binding process can be customized through specifying allowed fields,
+ * Binder that allows for setting property values on a target object, including
+ * support for validation and binding result analysis.
+ *
+ * <p>The binding process can be customized by specifying allowed field patterns,
  * required fields, custom editors, etc.
  *
- * <p>Note that there are potential security implications in failing to set an array
- * of allowed fields. In the case of HTTP form POST data for example, malicious clients
- * can attempt to subvert an application by supplying values for fields or properties
- * that do not exist on the form. In some cases this could lead to illegal data being
- * set on command objects <i>or their nested objects</i>. For this reason, it is
- * <b>highly recommended to specify the {@link #setAllowedFields allowedFields} property</b>
- * on the DataBinder.
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
  *
  * <p>The binding results can be examined via the {@link BindingResult} interface,
  * extending the {@link Errors} interface: see the {@link #getBindingResult()} method.
@@ -96,6 +98,7 @@
  * @author Rob Harrop
  * @author Stephane Nicoll
  * @author Kazuki Shimizu
+ * @author Sam Brannen
  * @see #setAllowedFields
  * @see #setRequiredFields
  * @see #registerCustomEditor
@@ -418,15 +421,21 @@ public boolean isIgnoreInvalidFields() {
 	}
 
 	/**
-	 * Register fields that should be allowed for binding. Default is all fields.
-	 * Restrict this for example to avoid unwanted modifications by malicious
+	 * Register field patterns that should be allowed for binding.
+	 * <p>Default is all fields.
+	 * <p>Restrict this for example to avoid unwanted modifications by malicious
 	 * users when binding HTTP request parameters.
-	 * <p>Supports "xxx*", "*xxx", "*xxx*" and "xxx*yyy" matches (with an
-	 * arbitrary number of pattern parts), as well as direct equality. More
-	 * sophisticated matching can be implemented by overriding the
-	 * {@code isAllowed} method.
-	 * <p>Alternatively, specify a list of <i>disallowed</i> fields.
-	 * @param allowedFields array of field names
+	 * <p>Supports {@code "xxx*"}, {@code "*xxx"}, {@code "*xxx*"}, and
+	 * {@code "xxx*yyy"} matches (with an arbitrary number of pattern parts), as
+	 * well as direct equality.
+	 * <p>The default implementation of this method stores allowed field patterns
+	 * in {@linkplain PropertyAccessorUtils#canonicalPropertyName(String) canonical}
+	 * form. Subclasses which override this method must therefore take this into
+	 * account.
+	 * <p>More sophisticated matching can be implemented by overriding the
+	 * {@link #isAllowed} method.
+	 * <p>Alternatively, specify a list of <i>disallowed</i> field patterns.
+	 * @param allowedFields array of allowed field patterns
 	 * @see #setDisallowedFields
 	 * @see #isAllowed(String)
 	 */
@@ -435,8 +444,9 @@ public void setAllowedFields(@Nullable String... allowedFields) {
 	}
 
 	/**
-	 * Return the fields that should be allowed for binding.
-	 * @return array of field names
+	 * Return the field patterns that should be allowed for binding.
+	 * @return array of allowed field patterns
+	 * @see #setAllowedFields(String...)
 	 */
 	@Nullable
 	public String[] getAllowedFields() {
@@ -444,25 +454,44 @@ public String[] getAllowedFields() {
 	}
 
 	/**
-	 * Register fields that should <i>not</i> be allowed for binding. Default
-	 * is none. Mark fields as disallowed for example to avoid unwanted
+	 * Register field patterns that should <i>not</i> be allowed for binding.
+	 * <p>Default is none.
+	 * <p>Mark fields as disallowed, for example to avoid unwanted
 	 * modifications by malicious users when binding HTTP request parameters.
-	 * <p>Supports "xxx*", "*xxx", "*xxx*" and "xxx*yyy" matches (with an
-	 * arbitrary number of pattern parts), as well as direct equality.
-	 * More sophisticated matching can be implemented by overriding the
-	 * {@code isAllowed} method.
-	 * <p>Alternatively, specify a list of <i>allowed</i> fields.
-	 * @param disallowedFields array of field names
+	 * <p>Supports {@code "xxx*"}, {@code "*xxx"}, {@code "*xxx*"}, and
+	 * {@code "xxx*yyy"} matches (with an arbitrary number of pattern parts), as
+	 * well as direct equality.
+	 * <p>The default implementation of this method stores disallowed field patterns
+	 * in {@linkplain PropertyAccessorUtils#canonicalPropertyName(String) canonical}
+	 * form. As of Spring Framework 5.2.21, the default implementation also transforms
+	 * disallowed field patterns to {@linkplain String#toLowerCase() lowercase} to
+	 * support case-insensitive pattern matching in {@link #isAllowed}. Subclasses
+	 * which override this method must therefore take both of these transformations
+	 * into account.
+	 * <p>More sophisticated matching can be implemented by overriding the
+	 * {@link #isAllowed} method.
+	 * <p>Alternatively, specify a list of <i>allowed</i> field patterns.
+	 * @param disallowedFields array of disallowed field patterns
 	 * @see #setAllowedFields
 	 * @see #isAllowed(String)
 	 */
 	public void setDisallowedFields(@Nullable String... disallowedFields) {
-		this.disallowedFields = PropertyAccessorUtils.canonicalPropertyNames(disallowedFields);
+		if (disallowedFields == null) {
+			this.disallowedFields = null;
+		}
+		else {
+			String[] fieldPatterns = new String[disallowedFields.length];
+			for (int i = 0; i < fieldPatterns.length; i++) {
+				fieldPatterns[i] = PropertyAccessorUtils.canonicalPropertyName(disallowedFields[i]).toLowerCase();
+			}
+			this.disallowedFields = fieldPatterns;
+		}
 	}
 
 	/**
-	 * Return the fields that should <i>not</i> be allowed for binding.
-	 * @return array of field names
+	 * Return the field patterns that should <i>not</i> be allowed for binding.
+	 * @return array of disallowed field patterns
+	 * @see #setDisallowedFields(String...)
 	 */
 	@Nullable
 	public String[] getDisallowedFields() {
@@ -774,16 +803,20 @@ protected void checkAllowedFields(MutablePropertyValues mpvs) {
 	}
 
 	/**
-	 * Return if the given field is allowed for binding.
-	 * Invoked for each passed-in property value.
-	 * <p>The default implementation checks for "xxx*", "*xxx", "*xxx*" and "xxx*yyy"
-	 * matches (with an arbitrary number of pattern parts), as well as direct equality,
-	 * in the specified lists of allowed fields and disallowed fields. A field matching
-	 * a disallowed pattern will not be accepted even if it also happens to match a
-	 * pattern in the allowed list.
-	 * <p>Can be overridden in subclasses.
+	 * Determine if the given field is allowed for binding.
+	 * <p>Invoked for each passed-in property value.
+	 * <p>Checks for {@code "xxx*"}, {@code "*xxx"}, {@code "*xxx*"}, and
+	 * {@code "xxx*yyy"} matches (with an arbitrary number of pattern parts), as
+	 * well as direct equality, in the configured lists of allowed field patterns
+	 * and disallowed field patterns.
+	 * <p>Matching against allowed field patterns is case-sensitive; whereas,
+	 * matching against disallowed field patterns is case-insensitive.
+	 * <p>A field matching a disallowed pattern will not be accepted even if it
+	 * also happens to match a pattern in the allowed list.
+	 * <p>Can be overridden in subclasses, but care must be taken to honor the
+	 * aforementioned contract.
 	 * @param field the field to check
-	 * @return if the field is allowed
+	 * @return {@code true} if the field is allowed
 	 * @see #setAllowedFields
 	 * @see #setDisallowedFields
 	 * @see org.springframework.util.PatternMatchUtils#simpleMatch(String, String)
@@ -792,7 +825,7 @@ protected boolean isAllowed(String field) {
 		String[] allowed = getAllowedFields();
 		String[] disallowed = getDisallowedFields();
 		return ((ObjectUtils.isEmpty(allowed) || PatternMatchUtils.simpleMatch(allowed, field)) &&
-				(ObjectUtils.isEmpty(disallowed) || !PatternMatchUtils.simpleMatch(disallowed, field)));
+				(ObjectUtils.isEmpty(disallowed) || !PatternMatchUtils.simpleMatch(disallowed, field.toLowerCase())));
 	}
 
 	/**
diff --git a/spring-context/src/main/java/org/springframework/validation/beanvalidation/LocalValidatorFactoryBean.java b/spring-context/src/main/java/org/springframework/validation/beanvalidation/LocalValidatorFactoryBean.java
index 73ec646bead7..25fc0727474a 100644
--- a/spring-context/src/main/java/org/springframework/validation/beanvalidation/LocalValidatorFactoryBean.java
+++ b/spring-context/src/main/java/org/springframework/validation/beanvalidation/LocalValidatorFactoryBean.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -26,6 +26,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
+import java.util.function.Consumer;
 
 import javax.validation.Configuration;
 import javax.validation.ConstraintValidatorFactory;
@@ -113,6 +114,9 @@ public class LocalValidatorFactoryBean extends SpringValidatorAdapter
 
 	private final Map<String, String> validationPropertyMap = new HashMap<>();
 
+	@Nullable
+	private Consumer<Configuration<?>> configurationInitializer;
+
 	@Nullable
 	private ApplicationContext applicationContext;
 
@@ -234,6 +238,18 @@ public Map<String, String> getValidationPropertyMap() {
 		return this.validationPropertyMap;
 	}
 
+	/**
+	 * Specify a callback for customizing the Bean Validation {@code Configuration} instance,
+	 * as an alternative to overriding the {@link #postProcessConfiguration(Configuration)}
+	 * method in custom {@code LocalValidatorFactoryBean} subclasses.
+	 * <p>This enables convenient customizations for application purposes. Infrastructure
+	 * extensions may keep overriding the {@link #postProcessConfiguration} template method.
+	 * @since 5.3.19
+	 */
+	public void setConfigurationInitializer(Consumer<Configuration<?>> configurationInitializer) {
+		this.configurationInitializer = configurationInitializer;
+	}
+
 	@Override
 	public void setApplicationContext(ApplicationContext applicationContext) {
 		this.applicationContext = applicationContext;
@@ -312,6 +328,9 @@ public void afterPropertiesSet() {
 		this.validationPropertyMap.forEach(configuration::addProperty);
 
 		// Allow for custom post-processing before we actually build the ValidatorFactory.
+		if (this.configurationInitializer != null) {
+			this.configurationInitializer.accept(configuration);
+		}
 		postProcessConfiguration(configuration);
 
 		try {
diff --git a/spring-context/src/test/java/org/springframework/aop/aspectj/autoproxy/AspectJAutoProxyCreatorTests.java b/spring-context/src/test/java/org/springframework/aop/aspectj/autoproxy/AspectJAutoProxyCreatorTests.java
index 7c017cfa1aad..c506e210636f 100644
--- a/spring-context/src/test/java/org/springframework/aop/aspectj/autoproxy/AspectJAutoProxyCreatorTests.java
+++ b/spring-context/src/test/java/org/springframework/aop/aspectj/autoproxy/AspectJAutoProxyCreatorTests.java
@@ -21,6 +21,8 @@
 import java.lang.reflect.Method;
 import java.util.function.Supplier;
 
+import org.aopalliance.aop.Advice;
+import org.aopalliance.intercept.MethodInvocation;
 import org.aspectj.lang.JoinPoint;
 import org.aspectj.lang.ProceedingJoinPoint;
 import org.aspectj.lang.annotation.Around;
@@ -31,11 +33,17 @@
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
 
+import org.springframework.aop.ClassFilter;
+import org.springframework.aop.IntroductionAdvisor;
+import org.springframework.aop.IntroductionInterceptor;
 import org.springframework.aop.MethodBeforeAdvice;
+import org.springframework.aop.SpringProxy;
 import org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator;
 import org.springframework.aop.aspectj.annotation.AspectMetadata;
 import org.springframework.aop.config.AopConfigUtils;
+import org.springframework.aop.framework.Advised;
 import org.springframework.aop.framework.ProxyConfig;
+import org.springframework.aop.support.AbstractPointcutAdvisor;
 import org.springframework.aop.support.AopUtils;
 import org.springframework.aop.support.StaticMethodMatcherPointcutAdvisor;
 import org.springframework.beans.PropertyValue;
@@ -52,6 +60,7 @@
 import org.springframework.context.annotation.EnableAspectJAutoProxy;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 import org.springframework.context.support.GenericApplicationContext;
+import org.springframework.core.DecoratingProxy;
 import org.springframework.core.NestedRuntimeException;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
@@ -304,10 +313,26 @@ public void testWithBeanNameAutoProxyCreator() {
 	@ValueSource(classes = {ProxyTargetClassFalseConfig.class, ProxyTargetClassTrueConfig.class})
 	void lambdaIsAlwaysProxiedWithJdkProxy(Class<?> configClass) {
 		try (ConfigurableApplicationContext context = new AnnotationConfigApplicationContext(configClass)) {
-			Supplier<?> supplier = context.getBean(Supplier.class);
+			@SuppressWarnings("unchecked")
+			Supplier<String> supplier = context.getBean(Supplier.class);
 			assertThat(AopUtils.isAopProxy(supplier)).as("AOP proxy").isTrue();
 			assertThat(AopUtils.isJdkDynamicProxy(supplier)).as("JDK Dynamic proxy").isTrue();
-			assertThat(supplier.get()).asString().isEqualTo("advised: lambda");
+			assertThat(supplier.getClass().getInterfaces())
+				.containsExactlyInAnyOrder(Supplier.class, SpringProxy.class, Advised.class, DecoratingProxy.class);
+			assertThat(supplier.get()).isEqualTo("advised: lambda");
+		}
+	}
+
+	@ParameterizedTest(name = "[{index}] {0}")
+	@ValueSource(classes = {MixinProxyTargetClassFalseConfig.class, MixinProxyTargetClassTrueConfig.class})
+	void lambdaIsAlwaysProxiedWithJdkProxyWithIntroductions(Class<?> configClass) {
+		try (ConfigurableApplicationContext context = new AnnotationConfigApplicationContext(configClass)) {
+			MessageGenerator messageGenerator = context.getBean(MessageGenerator.class);
+			assertThat(AopUtils.isAopProxy(messageGenerator)).as("AOP proxy").isTrue();
+			assertThat(AopUtils.isJdkDynamicProxy(messageGenerator)).as("JDK Dynamic proxy").isTrue();
+			assertThat(messageGenerator.getClass().getInterfaces())
+				.containsExactlyInAnyOrder(MessageGenerator.class, Mixin.class, SpringProxy.class, Advised.class, DecoratingProxy.class);
+			assertThat(messageGenerator.generateMessage()).isEqualTo("mixin: lambda");
 		}
 	}
 
@@ -616,3 +641,79 @@ class ProxyTargetClassFalseConfig extends AbstractProxyTargetClassConfig {
 @EnableAspectJAutoProxy(proxyTargetClass = true)
 class ProxyTargetClassTrueConfig extends AbstractProxyTargetClassConfig {
 }
+
+@FunctionalInterface
+interface MessageGenerator {
+	String generateMessage();
+}
+
+interface Mixin {
+}
+
+class MixinIntroductionInterceptor implements IntroductionInterceptor {
+
+	@Override
+	public Object invoke(MethodInvocation invocation) throws Throwable {
+		return "mixin: " + invocation.proceed();
+	}
+
+	@Override
+	public boolean implementsInterface(Class<?> intf) {
+		return Mixin.class.isAssignableFrom(intf);
+	}
+
+}
+
+@SuppressWarnings("serial")
+class MixinAdvisor extends AbstractPointcutAdvisor implements IntroductionAdvisor {
+
+	@Override
+	public org.springframework.aop.Pointcut getPointcut() {
+		return org.springframework.aop.Pointcut.TRUE;
+	}
+
+	@Override
+	public Advice getAdvice() {
+		return new MixinIntroductionInterceptor();
+	}
+
+	@Override
+	public Class<?>[] getInterfaces() {
+		return new Class[] { Mixin.class };
+	}
+
+	@Override
+	public ClassFilter getClassFilter() {
+		return MessageGenerator.class::isAssignableFrom;
+	}
+
+	@Override
+	public void validateInterfaces() {
+		/* no-op */
+	}
+
+}
+
+abstract class AbstractMixinConfig {
+
+	@Bean
+	MessageGenerator messageGenerator() {
+		return () -> "lambda";
+	}
+
+	@Bean
+	MixinAdvisor mixinAdvisor() {
+		return new MixinAdvisor();
+	}
+
+}
+
+@Configuration(proxyBeanMethods = false)
+@EnableAspectJAutoProxy(proxyTargetClass = false)
+class MixinProxyTargetClassFalseConfig extends AbstractMixinConfig {
+}
+
+@Configuration(proxyBeanMethods = false)
+@EnableAspectJAutoProxy(proxyTargetClass = true)
+class MixinProxyTargetClassTrueConfig extends AbstractMixinConfig {
+}
diff --git a/spring-context/src/test/java/org/springframework/validation/DataBinderTests.java b/spring-context/src/test/java/org/springframework/validation/DataBinderTests.java
index 3d39e2ecd309..546c599c01f7 100644
--- a/spring-context/src/test/java/org/springframework/validation/DataBinderTests.java
+++ b/spring-context/src/test/java/org/springframework/validation/DataBinderTests.java
@@ -64,23 +64,26 @@
 import org.springframework.format.support.FormattingConversionService;
 import org.springframework.lang.Nullable;
 import org.springframework.tests.sample.beans.BeanWithObjectProperty;
-import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
+import static org.assertj.core.api.Assertions.entry;
 
 /**
+ * Unit tests for {@link DataBinder}.
+ *
  * @author Rod Johnson
  * @author Juergen Hoeller
  * @author Rob Harrop
  * @author Kazuki Shimizu
+ * @author Sam Brannen
  */
 class DataBinderTests {
 
 	@Test
-	void testBindingNoErrors() throws BindException {
+	void bindingNoErrors() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		assertThat(binder.isIgnoreUnknownFields()).isTrue();
@@ -110,12 +113,11 @@ void testBindingNoErrors() throws BindException {
 		assertThat(ex).isEqualTo(binder.getBindingResult());
 
 		other.reject("xxx");
-		boolean condition = !other.equals(binder.getBindingResult());
-		assertThat(condition).isTrue();
+		assertThat(other).isNotEqualTo(binder.getBindingResult());
 	}
 
 	@Test
-	void testBindingWithDefaultConversionNoErrors() throws BindException {
+	void bindingWithDefaultConversionNoErrors() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		assertThat(binder.isIgnoreUnknownFields()).isTrue();
@@ -131,7 +133,7 @@ void testBindingWithDefaultConversionNoErrors() throws BindException {
 	}
 
 	@Test
-	void testNestedBindingWithDefaultConversionNoErrors() throws BindException {
+	void nestedBindingWithDefaultConversionNoErrors() throws BindException {
 		TestBean rod = new TestBean(new TestBean());
 		DataBinder binder = new DataBinder(rod, "person");
 		assertThat(binder.isIgnoreUnknownFields()).isTrue();
@@ -147,7 +149,7 @@ void testNestedBindingWithDefaultConversionNoErrors() throws BindException {
 	}
 
 	@Test
-	void testBindingNoErrorsNotIgnoreUnknown() {
+	void bindingNoErrorsNotIgnoreUnknown() {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		binder.setIgnoreUnknownFields(false);
@@ -160,7 +162,7 @@ void testBindingNoErrorsNotIgnoreUnknown() {
 	}
 
 	@Test
-	void testBindingNoErrorsWithInvalidField() {
+	void bindingNoErrorsWithInvalidField() {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		MutablePropertyValues pvs = new MutablePropertyValues();
@@ -171,7 +173,7 @@ void testBindingNoErrorsWithInvalidField() {
 	}
 
 	@Test
-	void testBindingNoErrorsWithIgnoreInvalid() {
+	void bindingNoErrorsWithIgnoreInvalid() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		binder.setIgnoreInvalidFields(true);
@@ -180,10 +182,14 @@ void testBindingNoErrorsWithIgnoreInvalid() {
 		pvs.add("spouse.age", 32);
 
 		binder.bind(pvs);
+		binder.close();
+
+		assertThat(rod.getName()).isEqualTo("Rod");
+		assertThat(rod.getSpouse()).isNull();
 	}
 
 	@Test
-	void testBindingWithErrors() {
+	void bindingWithErrors() {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		MutablePropertyValues pvs = new MutablePropertyValues();
@@ -245,7 +251,7 @@ void testBindingWithErrors() {
 	}
 
 	@Test
-	void testBindingWithSystemFieldError() {
+	void bindingWithSystemFieldError() {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		MutablePropertyValues pvs = new MutablePropertyValues();
@@ -257,7 +263,7 @@ void testBindingWithSystemFieldError() {
 	}
 
 	@Test
-	void testBindingWithErrorsAndCustomEditors() {
+	void bindingWithErrorsAndCustomEditors() {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		binder.registerCustomEditor(String.class, "touchy", new PropertyEditorSupport() {
@@ -325,7 +331,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testBindingWithCustomEditorOnObjectField() {
+	void bindingWithCustomEditorOnObjectField() {
 		BeanWithObjectProperty tb = new BeanWithObjectProperty();
 		DataBinder binder = new DataBinder(tb);
 		binder.registerCustomEditor(Integer.class, "object", new CustomNumberEditor(Integer.class, true));
@@ -336,7 +342,7 @@ void testBindingWithCustomEditorOnObjectField() {
 	}
 
 	@Test
-	void testBindingWithFormatter() {
+	void bindingWithFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		FormattingConversionService conversionService = new FormattingConversionService();
@@ -368,7 +374,7 @@ void testBindingWithFormatter() {
 	}
 
 	@Test
-	void testBindingErrorWithFormatter() {
+	void bindingErrorWithFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		FormattingConversionService conversionService = new FormattingConversionService();
@@ -391,7 +397,7 @@ void testBindingErrorWithFormatter() {
 	}
 
 	@Test
-	void testBindingErrorWithParseExceptionFromFormatter() {
+	void bindingErrorWithParseExceptionFromFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		FormattingConversionService conversionService = new FormattingConversionService();
@@ -419,7 +425,7 @@ public String print(String object, Locale locale) {
 	}
 
 	@Test
-	void testBindingErrorWithRuntimeExceptionFromFormatter() {
+	void bindingErrorWithRuntimeExceptionFromFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		FormattingConversionService conversionService = new FormattingConversionService();
@@ -447,7 +453,7 @@ public String print(String object, Locale locale) {
 	}
 
 	@Test
-	void testBindingWithFormatterAgainstList() {
+	void bindingWithFormatterAgainstList() {
 		BeanWithIntegerList tb = new BeanWithIntegerList();
 		DataBinder binder = new DataBinder(tb);
 		FormattingConversionService conversionService = new FormattingConversionService();
@@ -469,7 +475,7 @@ void testBindingWithFormatterAgainstList() {
 	}
 
 	@Test
-	void testBindingErrorWithFormatterAgainstList() {
+	void bindingErrorWithFormatterAgainstList() {
 		BeanWithIntegerList tb = new BeanWithIntegerList();
 		DataBinder binder = new DataBinder(tb);
 		FormattingConversionService conversionService = new FormattingConversionService();
@@ -492,7 +498,7 @@ void testBindingErrorWithFormatterAgainstList() {
 	}
 
 	@Test
-	void testBindingWithFormatterAgainstFields() {
+	void bindingWithFormatterAgainstFields() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		FormattingConversionService conversionService = new FormattingConversionService();
@@ -525,7 +531,7 @@ void testBindingWithFormatterAgainstFields() {
 	}
 
 	@Test
-	void testBindingErrorWithFormatterAgainstFields() {
+	void bindingErrorWithFormatterAgainstFields() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		binder.initDirectFieldAccess();
@@ -549,7 +555,7 @@ void testBindingErrorWithFormatterAgainstFields() {
 	}
 
 	@Test
-	void testBindingWithCustomFormatter() {
+	void bindingWithCustomFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		binder.addCustomFormatter(new NumberStyleFormatter(), Float.class);
@@ -578,7 +584,7 @@ void testBindingWithCustomFormatter() {
 	}
 
 	@Test
-	void testBindingErrorWithCustomFormatter() {
+	void bindingErrorWithCustomFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 		binder.addCustomFormatter(new NumberStyleFormatter());
@@ -599,7 +605,7 @@ void testBindingErrorWithCustomFormatter() {
 	}
 
 	@Test
-	void testBindingErrorWithParseExceptionFromCustomFormatter() {
+	void bindingErrorWithParseExceptionFromCustomFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 
@@ -624,7 +630,7 @@ public String print(String object, Locale locale) {
 	}
 
 	@Test
-	void testBindingErrorWithRuntimeExceptionFromCustomFormatter() {
+	void bindingErrorWithRuntimeExceptionFromCustomFormatter() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb);
 
@@ -649,7 +655,7 @@ public String print(String object, Locale locale) {
 	}
 
 	@Test
-	void testConversionWithInappropriateStringEditor() {
+	void conversionWithInappropriateStringEditor() {
 		DataBinder dataBinder = new DataBinder(null);
 		DefaultFormattingConversionService conversionService = new DefaultFormattingConversionService();
 		dataBinder.setConversionService(conversionService);
@@ -662,7 +668,7 @@ void testConversionWithInappropriateStringEditor() {
 	}
 
 	@Test
-	void testBindingWithAllowedFields() throws BindException {
+	void bindingWithAllowedFields() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod);
 		binder.setAllowedFields("name", "myparam");
@@ -672,30 +678,32 @@ void testBindingWithAllowedFields() throws BindException {
 
 		binder.bind(pvs);
 		binder.close();
-		assertThat(rod.getName().equals("Rod")).as("changed name correctly").isTrue();
-		assertThat(rod.getAge() == 0).as("did not change age").isTrue();
+
+		assertThat(rod.getName()).as("changed name correctly").isEqualTo("Rod");
+		assertThat(rod.getAge()).as("did not change age").isZero();
 	}
 
 	@Test
-	void testBindingWithDisallowedFields() throws BindException {
+	void bindingWithDisallowedFields() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod);
-		binder.setDisallowedFields("age");
+		binder.setDisallowedFields(" ", "\t", "favouriteColour", null, "age");
 		MutablePropertyValues pvs = new MutablePropertyValues();
 		pvs.add("name", "Rod");
 		pvs.add("age", "32x");
+		pvs.add("favouriteColour", "BLUE");
 
 		binder.bind(pvs);
 		binder.close();
-		assertThat(rod.getName().equals("Rod")).as("changed name correctly").isTrue();
-		assertThat(rod.getAge() == 0).as("did not change age").isTrue();
-		String[] disallowedFields = binder.getBindingResult().getSuppressedFields();
-		assertThat(disallowedFields.length).isEqualTo(1);
-		assertThat(disallowedFields[0]).isEqualTo("age");
+
+		assertThat(rod.getName()).as("changed name correctly").isEqualTo("Rod");
+		assertThat(rod.getAge()).as("did not change age").isZero();
+		assertThat(rod.getFavouriteColour()).as("did not change favourite colour").isNull();
+		assertThat(binder.getBindingResult().getSuppressedFields()).containsExactlyInAnyOrder("age", "favouriteColour");
 	}
 
 	@Test
-	void testBindingWithAllowedAndDisallowedFields() throws BindException {
+	void bindingWithAllowedAndDisallowedFields() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod);
 		binder.setAllowedFields("name", "myparam");
@@ -706,34 +714,32 @@ void testBindingWithAllowedAndDisallowedFields() throws BindException {
 
 		binder.bind(pvs);
 		binder.close();
-		assertThat(rod.getName().equals("Rod")).as("changed name correctly").isTrue();
-		assertThat(rod.getAge() == 0).as("did not change age").isTrue();
-		String[] disallowedFields = binder.getBindingResult().getSuppressedFields();
-		assertThat(disallowedFields).hasSize(1);
-		assertThat(disallowedFields[0]).isEqualTo("age");
+
+		assertThat(rod.getName()).as("changed name correctly").isEqualTo("Rod");
+		assertThat(rod.getAge()).as("did not change age").isZero();
+		assertThat(binder.getBindingResult().getSuppressedFields()).containsExactly("age");
 	}
 
 	@Test
-	void testBindingWithOverlappingAllowedAndDisallowedFields() throws BindException {
+	void bindingWithOverlappingAllowedAndDisallowedFields() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod);
 		binder.setAllowedFields("name", "age");
-		binder.setDisallowedFields("age");
+		binder.setDisallowedFields("AGE");
 		MutablePropertyValues pvs = new MutablePropertyValues();
 		pvs.add("name", "Rod");
 		pvs.add("age", "32x");
 
 		binder.bind(pvs);
 		binder.close();
-		assertThat(rod.getName().equals("Rod")).as("changed name correctly").isTrue();
-		assertThat(rod.getAge() == 0).as("did not change age").isTrue();
-		String[] disallowedFields = binder.getBindingResult().getSuppressedFields();
-		assertThat(disallowedFields).hasSize(1);
-		assertThat(disallowedFields[0]).isEqualTo("age");
+
+		assertThat(rod.getName()).as("changed name correctly").isEqualTo("Rod");
+		assertThat(rod.getAge()).as("did not change age").isZero();
+		assertThat(binder.getBindingResult().getSuppressedFields()).containsExactly("age");
 	}
 
 	@Test
-	void testBindingWithAllowedFieldsUsingAsterisks() throws BindException {
+	void bindingWithAllowedFieldsUsingAsterisks() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		binder.setAllowedFields("nam*", "*ouchy");
@@ -760,11 +766,11 @@ void testBindingWithAllowedFieldsUsingAsterisks() throws BindException {
 	}
 
 	@Test
-	void testBindingWithAllowedAndDisallowedMapFields() throws BindException {
+	void bindingWithAllowedAndDisallowedMapFields() throws BindException {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod);
 		binder.setAllowedFields("someMap[key1]", "someMap[key2]");
-		binder.setDisallowedFields("someMap['key3']", "someMap[key4]");
+		binder.setDisallowedFields("someMap['KEY3']", "SomeMap[key4]");
 
 		MutablePropertyValues pvs = new MutablePropertyValues();
 		pvs.add("someMap[key1]", "value1");
@@ -774,21 +780,18 @@ void testBindingWithAllowedAndDisallowedMapFields() throws BindException {
 
 		binder.bind(pvs);
 		binder.close();
-		assertThat(rod.getSomeMap().get("key1")).isEqualTo("value1");
-		assertThat(rod.getSomeMap().get("key2")).isEqualTo("value2");
-		assertThat(rod.getSomeMap().get("key3")).isNull();
-		assertThat(rod.getSomeMap().get("key4")).isNull();
-		String[] disallowedFields = binder.getBindingResult().getSuppressedFields();
-		assertThat(disallowedFields).hasSize(2);
-		assertThat(ObjectUtils.containsElement(disallowedFields, "someMap[key3]")).isTrue();
-		assertThat(ObjectUtils.containsElement(disallowedFields, "someMap[key4]")).isTrue();
+
+		@SuppressWarnings("unchecked")
+		Map<String, String> someMap = (Map<String, String>) rod.getSomeMap();
+		assertThat(someMap).containsOnly(entry("key1", "value1"), entry("key2", "value2"));
+		assertThat(binder.getBindingResult().getSuppressedFields()).containsExactly("someMap[key3]", "someMap[key4]");
 	}
 
 	/**
 	 * Tests for required field, both null, non-existing and empty strings.
 	 */
 	@Test
-	void testBindingWithRequiredFields() {
+	void bindingWithRequiredFields() {
 		TestBean tb = new TestBean();
 		tb.setSpouse(new TestBean());
 
@@ -819,7 +822,7 @@ void testBindingWithRequiredFields() {
 	}
 
 	@Test
-	void testBindingWithRequiredMapFields() {
+	void bindingWithRequiredMapFields() {
 		TestBean tb = new TestBean();
 		tb.setSpouse(new TestBean());
 
@@ -839,7 +842,7 @@ void testBindingWithRequiredMapFields() {
 	}
 
 	@Test
-	void testBindingWithNestedObjectCreation() {
+	void bindingWithNestedObjectCreation() {
 		TestBean tb = new TestBean();
 
 		DataBinder binder = new DataBinder(tb, "person");
@@ -860,7 +863,7 @@ public void setAsText(String text) throws IllegalArgumentException {
 	}
 
 	@Test
-	void testCustomEditorWithOldValueAccess() {
+	void customEditorWithOldValueAccess() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 
@@ -885,7 +888,7 @@ public void setAsText(String text) throws IllegalArgumentException {
 	}
 
 	@Test
-	void testCustomEditorForSingleProperty() {
+	void customEditorForSingleProperty() {
 		TestBean tb = new TestBean();
 		tb.setSpouse(new TestBean());
 		DataBinder binder = new DataBinder(tb, "tb");
@@ -925,7 +928,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testCustomEditorForPrimitiveProperty() {
+	void customEditorForPrimitiveProperty() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 
@@ -949,7 +952,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testCustomEditorForAllStringProperties() {
+	void customEditorForAllStringProperties() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 
@@ -981,7 +984,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testCustomFormatterForSingleProperty() {
+	void customFormatterForSingleProperty() {
 		TestBean tb = new TestBean();
 		tb.setSpouse(new TestBean());
 		DataBinder binder = new DataBinder(tb, "tb");
@@ -1021,7 +1024,7 @@ public String print(String object, Locale locale) {
 	}
 
 	@Test
-	void testCustomFormatterForPrimitiveProperty() {
+	void customFormatterForPrimitiveProperty() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 
@@ -1045,7 +1048,7 @@ public String print(Integer object, Locale locale) {
 	}
 
 	@Test
-	void testCustomFormatterForAllStringProperties() {
+	void customFormatterForAllStringProperties() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 
@@ -1077,7 +1080,7 @@ public String print(String object, Locale locale) {
 	}
 
 	@Test
-	void testJavaBeanPropertyConventions() {
+	void javaBeanPropertyConventions() {
 		Book book = new Book();
 		DataBinder binder = new DataBinder(book);
 
@@ -1101,7 +1104,7 @@ void testJavaBeanPropertyConventions() {
 	}
 
 	@Test
-	void testOptionalProperty() {
+	void optionalProperty() {
 		OptionalHolder bean = new OptionalHolder();
 		DataBinder binder = new DataBinder(bean);
 		binder.setConversionService(new DefaultConversionService());
@@ -1122,7 +1125,7 @@ void testOptionalProperty() {
 	}
 
 	@Test
-	void testValidatorNoErrors() throws Exception {
+	void validatorNoErrors() throws Exception {
 		TestBean tb = new TestBean();
 		tb.setAge(33);
 		tb.setName("Rod");
@@ -1175,15 +1178,13 @@ void testValidatorNoErrors() throws Exception {
 		assertThat(errors.getNestedPath()).isEqualTo("spouse.");
 
 		assertThat(errors.getErrorCount()).isEqualTo(1);
-		boolean condition1 = !errors.hasGlobalErrors();
-		assertThat(condition1).isTrue();
+		assertThat(errors.hasGlobalErrors()).isFalse();
 		assertThat(errors.getFieldErrorCount("age")).isEqualTo(1);
-		boolean condition = !errors.hasFieldErrors("name");
-		assertThat(condition).isTrue();
+		assertThat(errors.hasFieldErrors("name")).isFalse();
 	}
 
 	@Test
-	void testValidatorWithErrors() {
+	void validatorWithErrors() {
 		TestBean tb = new TestBean();
 		tb.setSpouse(new TestBean());
 
@@ -1252,7 +1253,7 @@ void testValidatorWithErrors() {
 	}
 
 	@Test
-	void testValidatorWithErrorsAndCodesPrefix() {
+	void validatorWithErrorsAndCodesPrefix() {
 		TestBean tb = new TestBean();
 		tb.setSpouse(new TestBean());
 
@@ -1324,7 +1325,7 @@ void testValidatorWithErrorsAndCodesPrefix() {
 	}
 
 	@Test
-	void testValidatorWithNestedObjectNull() {
+	void validatorWithNestedObjectNull() {
 		TestBean tb = new TestBean();
 		Errors errors = new BeanPropertyBindingResult(tb, "tb");
 		Validator testValidator = new TestBeanValidator();
@@ -1343,7 +1344,7 @@ void testValidatorWithNestedObjectNull() {
 	}
 
 	@Test
-	void testNestedValidatorWithoutNestedPath() {
+	void nestedValidatorWithoutNestedPath() {
 		TestBean tb = new TestBean();
 		tb.setName("XXX");
 		Errors errors = new BeanPropertyBindingResult(tb, "tb");
@@ -1357,7 +1358,8 @@ void testNestedValidatorWithoutNestedPath() {
 	}
 
 	@Test
-	void testBindingStringArrayToIntegerSet() {
+	@SuppressWarnings("unchecked")
+	void bindingStringArrayToIntegerSet() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(Set.class, new CustomCollectionEditor(TreeSet.class) {
@@ -1371,12 +1373,8 @@ protected Object convertElement(Object element) {
 		binder.bind(pvs);
 
 		assertThat(binder.getBindingResult().getFieldValue("set")).isEqualTo(tb.getSet());
-		boolean condition = tb.getSet() instanceof TreeSet;
-		assertThat(condition).isTrue();
-		assertThat(tb.getSet().size()).isEqualTo(3);
-		assertThat(tb.getSet().contains(10)).isTrue();
-		assertThat(tb.getSet().contains(20)).isTrue();
-		assertThat(tb.getSet().contains(30)).isTrue();
+		assertThat(tb.getSet()).isInstanceOf(TreeSet.class);
+		assertThat((Set<Integer>) tb.getSet()).containsExactly(10, 20, 30);
 
 		pvs = new MutablePropertyValues();
 		pvs.add("set", null);
@@ -1386,7 +1384,7 @@ protected Object convertElement(Object element) {
 	}
 
 	@Test
-	void testBindingNullToEmptyCollection() {
+	void bindingNullToEmptyCollection() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(Set.class, new CustomCollectionEditor(TreeSet.class, true));
@@ -1394,13 +1392,12 @@ void testBindingNullToEmptyCollection() {
 		pvs.add("set", null);
 		binder.bind(pvs);
 
-		boolean condition = tb.getSet() instanceof TreeSet;
-		assertThat(condition).isTrue();
-		assertThat(tb.getSet().isEmpty()).isTrue();
+		assertThat(tb.getSet()).isInstanceOf(TreeSet.class);
+		assertThat(tb.getSet()).isEmpty();
 	}
 
 	@Test
-	void testBindingToIndexedField() {
+	void bindingToIndexedField() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(String.class, "array.name", new PropertyEditorSupport() {
@@ -1439,7 +1436,7 @@ public void setAsText(String text) throws IllegalArgumentException {
 	}
 
 	@Test
-	void testBindingToNestedIndexedField() {
+	void bindingToNestedIndexedField() {
 		IndexedTestBean tb = new IndexedTestBean();
 		tb.getArray()[0].setNestedIndexedBean(new IndexedTestBean());
 		tb.getArray()[1].setNestedIndexedBean(new IndexedTestBean());
@@ -1470,7 +1467,7 @@ public void setAsText(String text) throws IllegalArgumentException {
 	}
 
 	@Test
-	void testEditorForNestedIndexedField() {
+	void editorForNestedIndexedField() {
 		IndexedTestBean tb = new IndexedTestBean();
 		tb.getArray()[0].setNestedIndexedBean(new IndexedTestBean());
 		tb.getArray()[1].setNestedIndexedBean(new IndexedTestBean());
@@ -1496,7 +1493,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testSpecificEditorForNestedIndexedField() {
+	void specificEditorForNestedIndexedField() {
 		IndexedTestBean tb = new IndexedTestBean();
 		tb.getArray()[0].setNestedIndexedBean(new IndexedTestBean());
 		tb.getArray()[1].setNestedIndexedBean(new IndexedTestBean());
@@ -1522,7 +1519,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testInnerSpecificEditorForNestedIndexedField() {
+	void innerSpecificEditorForNestedIndexedField() {
 		IndexedTestBean tb = new IndexedTestBean();
 		tb.getArray()[0].setNestedIndexedBean(new IndexedTestBean());
 		tb.getArray()[1].setNestedIndexedBean(new IndexedTestBean());
@@ -1548,7 +1545,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testDirectBindingToIndexedField() {
+	void directBindingToIndexedField() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(TestBean.class, "array", new PropertyEditorSupport() {
@@ -1601,7 +1598,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testDirectBindingToEmptyIndexedFieldWithRegisteredSpecificEditor() {
+	void directBindingToEmptyIndexedFieldWithRegisteredSpecificEditor() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(TestBean.class, "map[key0]", new PropertyEditorSupport() {
@@ -1632,7 +1629,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testDirectBindingToEmptyIndexedFieldWithRegisteredGenericEditor() {
+	void directBindingToEmptyIndexedFieldWithRegisteredGenericEditor() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(TestBean.class, "map", new PropertyEditorSupport() {
@@ -1663,7 +1660,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testCustomEditorWithSubclass() {
+	void customEditorWithSubclass() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(TestBean.class, new PropertyEditorSupport() {
@@ -1697,7 +1694,7 @@ public String getAsText() {
 	}
 
 	@Test
-	void testBindToStringArrayWithArrayEditor() {
+	void bindToStringArrayWithArrayEditor() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(String[].class, "stringArray", new PropertyEditorSupport() {
@@ -1709,15 +1706,12 @@ public void setAsText(String text) throws IllegalArgumentException {
 		MutablePropertyValues pvs = new MutablePropertyValues();
 		pvs.add("stringArray", "a1-b2");
 		binder.bind(pvs);
-		boolean condition = !binder.getBindingResult().hasErrors();
-		assertThat(condition).isTrue();
-		assertThat(tb.getStringArray().length).isEqualTo(2);
-		assertThat(tb.getStringArray()[0]).isEqualTo("a1");
-		assertThat(tb.getStringArray()[1]).isEqualTo("b2");
+		assertThat(binder.getBindingResult().hasErrors()).isFalse();
+		assertThat(tb.getStringArray()).containsExactly("a1", "b2");
 	}
 
 	@Test
-	void testBindToStringArrayWithComponentEditor() {
+	void bindToStringArrayWithComponentEditor() {
 		TestBean tb = new TestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		binder.registerCustomEditor(String.class, "stringArray", new PropertyEditorSupport() {
@@ -1729,15 +1723,14 @@ public void setAsText(String text) throws IllegalArgumentException {
 		MutablePropertyValues pvs = new MutablePropertyValues();
 		pvs.add("stringArray", new String[] {"a1", "b2"});
 		binder.bind(pvs);
-		boolean condition = !binder.getBindingResult().hasErrors();
-		assertThat(condition).isTrue();
+		assertThat(binder.getBindingResult().hasErrors()).isFalse();
 		assertThat(tb.getStringArray().length).isEqualTo(2);
 		assertThat(tb.getStringArray()[0]).isEqualTo("Xa1");
 		assertThat(tb.getStringArray()[1]).isEqualTo("Xb2");
 	}
 
 	@Test
-	void testBindingErrors() {
+	void bindingErrors() {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		MutablePropertyValues pvs = new MutablePropertyValues();
@@ -1764,7 +1757,7 @@ void testBindingErrors() {
 	}
 
 	@Test
-	void testAddAllErrors() {
+	void addAllErrors() {
 		TestBean rod = new TestBean();
 		DataBinder binder = new DataBinder(rod, "person");
 		MutablePropertyValues pvs = new MutablePropertyValues();
@@ -1784,7 +1777,7 @@ void testAddAllErrors() {
 
 	@Test
 	@SuppressWarnings("unchecked")
-	void testBindingWithResortedList() {
+	void bindingWithResortedList() {
 		IndexedTestBean tb = new IndexedTestBean();
 		DataBinder binder = new DataBinder(tb, "tb");
 		MutablePropertyValues pvs = new MutablePropertyValues();
@@ -1802,7 +1795,7 @@ void testBindingWithResortedList() {
 	}
 
 	@Test
-	void testRejectWithoutDefaultMessage() {
+	void rejectWithoutDefaultMessage() {
 		TestBean tb = new TestBean();
 		tb.setName("myName");
 		tb.setAge(99);
@@ -1820,7 +1813,7 @@ void testRejectWithoutDefaultMessage() {
 	}
 
 	@Test
-	void testBindExceptionSerializable() throws Exception {
+	void bindExceptionSerializable() throws Exception {
 		SerializablePerson tb = new SerializablePerson();
 		tb.setName("myName");
 		tb.setAge(99);
@@ -1849,27 +1842,27 @@ void testBindExceptionSerializable() throws Exception {
 	}
 
 	@Test
-	void testTrackDisallowedFields() {
+	void trackDisallowedFields() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		binder.setAllowedFields("name", "age");
 
 		String name = "Rob Harrop";
-		String beanName = "foobar";
+		int age = 42;
 
 		MutablePropertyValues mpvs = new MutablePropertyValues();
 		mpvs.add("name", name);
-		mpvs.add("beanName", beanName);
+		mpvs.add("age", age);
+		mpvs.add("beanName", "foobar");
 		binder.bind(mpvs);
 
 		assertThat(testBean.getName()).isEqualTo(name);
-		String[] disallowedFields = binder.getBindingResult().getSuppressedFields();
-		assertThat(disallowedFields).hasSize(1);
-		assertThat(disallowedFields[0]).isEqualTo("beanName");
+		assertThat(testBean.getAge()).isEqualTo(age);
+		assertThat(binder.getBindingResult().getSuppressedFields()).containsExactly("beanName");
 	}
 
 	@Test
-	void testAutoGrowWithinDefaultLimit() {
+	void autoGrowWithinDefaultLimit() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 
@@ -1881,7 +1874,7 @@ void testAutoGrowWithinDefaultLimit() {
 	}
 
 	@Test
-	void testAutoGrowBeyondDefaultLimit() {
+	void autoGrowBeyondDefaultLimit() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 
@@ -1894,7 +1887,7 @@ void testAutoGrowBeyondDefaultLimit() {
 	}
 
 	@Test
-	void testAutoGrowWithinCustomLimit() {
+	void autoGrowWithinCustomLimit() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		binder.setAutoGrowCollectionLimit(10);
@@ -1907,7 +1900,7 @@ void testAutoGrowWithinCustomLimit() {
 	}
 
 	@Test
-	void testAutoGrowBeyondCustomLimit() {
+	void autoGrowBeyondCustomLimit() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		binder.setAutoGrowCollectionLimit(10);
@@ -1921,7 +1914,7 @@ void testAutoGrowBeyondCustomLimit() {
 	}
 
 	@Test
-	void testNestedGrowingList() {
+	void nestedGrowingList() {
 		Form form = new Form();
 		DataBinder binder = new DataBinder(form, "form");
 		MutablePropertyValues mpv = new MutablePropertyValues();
@@ -1937,7 +1930,7 @@ void testNestedGrowingList() {
 	}
 
 	@Test
-	void testFieldErrorAccessVariations() {
+	void fieldErrorAccessVariations() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		assertThat(binder.getBindingResult().getGlobalError()).isNull();
@@ -1958,7 +1951,7 @@ void testFieldErrorAccessVariations() {
 	}
 
 	@Test  // SPR-14888
-	void testSetAutoGrowCollectionLimit() {
+	void setAutoGrowCollectionLimit() {
 		BeanWithIntegerList tb = new BeanWithIntegerList();
 		DataBinder binder = new DataBinder(tb);
 		binder.setAutoGrowCollectionLimit(257);
@@ -1972,7 +1965,7 @@ void testSetAutoGrowCollectionLimit() {
 	}
 
 	@Test  // SPR-14888
-	void testSetAutoGrowCollectionLimitAfterInitialization() {
+	void setAutoGrowCollectionLimitAfterInitialization() {
 		DataBinder binder = new DataBinder(new BeanWithIntegerList());
 		binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));
 		assertThatIllegalStateException().isThrownBy(() ->
@@ -1981,7 +1974,7 @@ void testSetAutoGrowCollectionLimitAfterInitialization() {
 	}
 
 	@Test // SPR-15009
-	void testSetCustomMessageCodesResolverBeforeInitializeBindingResultForBeanPropertyAccess() {
+	void setCustomMessageCodesResolverBeforeInitializeBindingResultForBeanPropertyAccess() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		DefaultMessageCodesResolver messageCodesResolver = new DefaultMessageCodesResolver();
@@ -1998,7 +1991,7 @@ void testSetCustomMessageCodesResolverBeforeInitializeBindingResultForBeanProper
 	}
 
 	@Test // SPR-15009
-	void testSetCustomMessageCodesResolverBeforeInitializeBindingResultForDirectFieldAccess() {
+	void setCustomMessageCodesResolverBeforeInitializeBindingResultForDirectFieldAccess() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		DefaultMessageCodesResolver messageCodesResolver = new DefaultMessageCodesResolver();
@@ -2013,7 +2006,7 @@ void testSetCustomMessageCodesResolverBeforeInitializeBindingResultForDirectFiel
 	}
 
 	@Test  // SPR-15009
-	void testSetCustomMessageCodesResolverAfterInitializeBindingResult() {
+	void setCustomMessageCodesResolverAfterInitializeBindingResult() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		binder.initBeanPropertyAccess();
@@ -2028,7 +2021,7 @@ void testSetCustomMessageCodesResolverAfterInitializeBindingResult() {
 	}
 
 	@Test  // SPR-15009
-	void testSetMessageCodesResolverIsNullAfterInitializeBindingResult() {
+	void setMessageCodesResolverIsNullAfterInitializeBindingResult() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		binder.initBeanPropertyAccess();
@@ -2042,8 +2035,7 @@ void testSetMessageCodesResolverIsNullAfterInitializeBindingResult() {
 	}
 
 	@Test  // SPR-15009
-	void testCallSetMessageCodesResolverTwice() {
-
+	void callSetMessageCodesResolverTwice() {
 		TestBean testBean = new TestBean();
 		DataBinder binder = new DataBinder(testBean, "testBean");
 		binder.setMessageCodesResolver(new DefaultMessageCodesResolver());
diff --git a/spring-context/src/test/java/org/springframework/validation/beanvalidation/ValidatorFactoryTests.java b/spring-context/src/test/java/org/springframework/validation/beanvalidation/ValidatorFactoryTests.java
index ca7c256cd890..4b81bfe12ac9 100644
--- a/spring-context/src/test/java/org/springframework/validation/beanvalidation/ValidatorFactoryTests.java
+++ b/spring-context/src/test/java/org/springframework/validation/beanvalidation/ValidatorFactoryTests.java
@@ -31,6 +31,7 @@
 import javax.validation.Constraint;
 import javax.validation.ConstraintValidator;
 import javax.validation.ConstraintValidatorContext;
+import javax.validation.ConstraintValidatorFactory;
 import javax.validation.ConstraintViolation;
 import javax.validation.Payload;
 import javax.validation.Valid;
@@ -43,6 +44,7 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.core.convert.support.DefaultConversionService;
@@ -313,6 +315,32 @@ void listValidation() {
 		validator.destroy();
 	}
 
+	@Test
+	void withConstraintValidatorFactory() {
+		ConstraintValidatorFactory cvf = new SpringConstraintValidatorFactory(new DefaultListableBeanFactory());
+
+		@SuppressWarnings("resource")
+		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
+		validator.setConstraintValidatorFactory(cvf);
+		validator.afterPropertiesSet();
+
+		assertThat(validator.getConstraintValidatorFactory()).isSameAs(cvf);
+		validator.destroy();
+	}
+
+	@Test
+	void withCustomInitializer() {
+		ConstraintValidatorFactory cvf = new SpringConstraintValidatorFactory(new DefaultListableBeanFactory());
+
+		@SuppressWarnings("resource")
+		LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
+		validator.setConfigurationInitializer(configuration -> configuration.constraintValidatorFactory(cvf));
+		validator.afterPropertiesSet();
+
+		assertThat(validator.getConstraintValidatorFactory()).isSameAs(cvf);
+		validator.destroy();
+	}
+
 
 	@NameAddressValid
 	public static class ValidPerson {
@@ -409,8 +437,8 @@ public boolean isValid(ValidPerson value, ConstraintValidatorContext context) {
 			}
 			boolean valid = (value.name == null || !value.address.street.contains(value.name));
 			if (!valid && "Phil".equals(value.name)) {
-				context.buildConstraintViolationWithTemplate(
-						context.getDefaultConstraintMessageTemplate()).addPropertyNode("address").addConstraintViolation().disableDefaultConstraintViolation();
+				context.buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate())
+						.addPropertyNode("address").addConstraintViolation().disableDefaultConstraintViolation();
 			}
 			return valid;
 		}
@@ -446,6 +474,7 @@ public static class InnerBean {
 		public String getValue() {
 			return value;
 		}
+
 		public void setValue(String value) {
 			this.value = value;
 		}
@@ -454,7 +483,7 @@ public void setValue(String value) {
 
 	@Retention(RetentionPolicy.RUNTIME)
 	@Target(ElementType.FIELD)
-	@Constraint(validatedBy=InnerValidator.class)
+	@Constraint(validatedBy = InnerValidator.class)
 	public @interface InnerValid {
 
 		String message() default "NOT VALID";
@@ -475,7 +504,8 @@ public void initialize(InnerValid constraintAnnotation) {
 		public boolean isValid(InnerBean bean, ConstraintValidatorContext context) {
 			context.disableDefaultConstraintViolation();
 			if (bean.getValue() == null) {
-				context.buildConstraintViolationWithTemplate("NULL").addPropertyNode("value").addConstraintViolation();
+				context.buildConstraintViolationWithTemplate("NULL")
+						.addPropertyNode("value").addConstraintViolation();
 				return false;
 			}
 			return true;
@@ -523,7 +553,8 @@ public boolean isValid(List<String> list, ConstraintValidatorContext context) {
 			boolean valid = true;
 			for (int i = 0; i < list.size(); i++) {
 				if ("X".equals(list.get(i))) {
-					context.buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate()).addBeanNode().inIterable().atIndex(i).addConstraintViolation();
+					context.buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate())
+							.addBeanNode().inIterable().atIndex(i).addConstraintViolation();
 					valid = false;
 				}
 			}
diff --git a/spring-context/src/test/resources/org/springframework/jmx/export/notificationPublisherTests.xml b/spring-context/src/test/resources/org/springframework/jmx/export/notificationPublisherTests.xml
index 8b8699a8e289..5f4b476586b6 100644
--- a/spring-context/src/test/resources/org/springframework/jmx/export/notificationPublisherTests.xml
+++ b/spring-context/src/test/resources/org/springframework/jmx/export/notificationPublisherTests.xml
@@ -5,19 +5,19 @@
 
 	<bean id="publisher" class="org.springframework.jmx.export.NotificationPublisherTests$MyNotificationPublisher"/>
 
-  <bean id="publisherMBean" class="org.springframework.jmx.export.NotificationPublisherTests$MyNotificationPublisherMBean"/>
+	<bean id="publisherMBean" class="org.springframework.jmx.export.NotificationPublisherTests$MyNotificationPublisherMBean"/>
 
-  <bean id="publisherStandardMBean" class="org.springframework.jmx.export.NotificationPublisherTests$MyNotificationPublisherStandardMBean"/>
+	<bean id="publisherStandardMBean" class="org.springframework.jmx.export.NotificationPublisherTests$MyNotificationPublisherStandardMBean"/>
 
 	<bean id="exporter" class="org.springframework.jmx.export.MBeanExporter">
 		<property name="beans">
 			<map>
 				<entry key="spring:type=Publisher" value-ref="publisher"/>
-        <entry key="spring:type=PublisherMBean" value-ref="publisherMBean"/>
-        <entry key="spring:type=PublisherStandardMBean" value-ref="publisherStandardMBean"/>
+				<entry key="spring:type=PublisherMBean" value-ref="publisherMBean"/>
+				<entry key="spring:type=PublisherStandardMBean" value-ref="publisherStandardMBean"/>
 			</map>
 		</property>
-    <property name="server" ref="server"/>
+    	<property name="server" ref="server"/>
 	</bean>
 
 </beans>
\ No newline at end of file
diff --git a/spring-core/src/main/java/org/springframework/core/convert/Property.java b/spring-core/src/main/java/org/springframework/core/convert/Property.java
index 5cddaea8769f..bf9ae585181a 100644
--- a/spring-core/src/main/java/org/springframework/core/convert/Property.java
+++ b/spring-core/src/main/java/org/springframework/core/convert/Property.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -47,7 +47,7 @@
  */
 public final class Property {
 
-	private static Map<Property, Annotation[]> annotationCache = new ConcurrentReferenceHashMap<>();
+	private static final Map<Property, Annotation[]> annotationCache = new ConcurrentReferenceHashMap<>();
 
 	private final Class<?> objectType;
 
diff --git a/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java b/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java
index ad0419ee4b77..3e9668875661 100644
--- a/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java
+++ b/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -1061,7 +1061,7 @@ protected void hookOnComplete() {
 
 		@Override
 		public Context currentContext() {
-			return this.sink.currentContext();
+			return Context.of(this.sink.contextView());
 		}
 
 	}
@@ -1158,7 +1158,7 @@ private void sinkDataBuffer() {
 
 		@Override
 		public Context currentContext() {
-			return this.sink.currentContext();
+			return Context.of(this.sink.contextView());
 		}
 
 	}
diff --git a/spring-core/src/main/java/org/springframework/util/ClassUtils.java b/spring-core/src/main/java/org/springframework/util/ClassUtils.java
index 0df6e0ece4c1..d5858c7399c7 100644
--- a/spring-core/src/main/java/org/springframework/util/ClassUtils.java
+++ b/spring-core/src/main/java/org/springframework/util/ClassUtils.java
@@ -842,6 +842,20 @@ public static boolean isInnerClass(Class<?> clazz) {
 		return (clazz.isMemberClass() && !Modifier.isStatic(clazz.getModifiers()));
 	}
 
+	/**
+	 * Determine if the supplied {@link Class} is a JVM-generated implementation
+	 * class for a lambda expression or method reference.
+	 * <p>This method makes a best-effort attempt at determining this, based on
+	 * checks that work on modern, mainstream JVMs.
+	 * @param clazz the class to check
+	 * @return {@code true} if the class is a lambda implementation class
+	 * @since 5.3.19
+	 */
+	public static boolean isLambdaClass(Class<?> clazz) {
+		return (clazz.isSynthetic() && (clazz.getSuperclass() == Object.class) &&
+				(clazz.getInterfaces().length > 0) && clazz.getName().contains("$$Lambda"));
+	}
+
 	/**
 	 * Check whether the given object is a CGLIB proxy.
 	 * @param object the object to check
diff --git a/spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java b/spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java
index 05809bc5ad7b..c7c5468b5896 100644
--- a/spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java
+++ b/spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java
@@ -65,6 +65,17 @@ public abstract class MimeTypeUtils {
 	 */
 	public static final String ALL_VALUE = "*/*";
 
+	/**
+	 * Public constant mime type for {@code application/graphql+json}.
+	 * @see <a href="https://github.com/graphql/graphql-over-http">GraphQL over HTTP spec</a>
+	 * */
+	public static final MimeType APPLICATION_GRAPHQL;
+
+	/**
+	 * A String equivalent of {@link MimeTypeUtils#APPLICATION_GRAPHQL}.
+	 */
+	public static final String APPLICATION_GRAPHQL_VALUE = "application/graphql+json";
+
 	/**
 	 * Public constant mime type for {@code application/json}.
 	 * */
@@ -165,6 +176,7 @@ public abstract class MimeTypeUtils {
 	static {
 		// Not using "parseMimeType" to avoid static init cost
 		ALL = new MimeType("*", "*");
+		APPLICATION_GRAPHQL = new MimeType("application", "graphql+json");
 		APPLICATION_JSON = new MimeType("application", "json");
 		APPLICATION_OCTET_STREAM = new MimeType("application", "octet-stream");
 		APPLICATION_XML = new MimeType("application", "xml");
diff --git a/spring-core/src/test/java/org/springframework/util/ClassUtilsTests.java b/spring-core/src/test/java/org/springframework/util/ClassUtilsTests.java
index f14412ba4b18..640ec87eb5b4 100644
--- a/spring-core/src/test/java/org/springframework/util/ClassUtilsTests.java
+++ b/spring-core/src/test/java/org/springframework/util/ClassUtilsTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -31,6 +31,7 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Set;
+import java.util.function.Supplier;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Nested;
@@ -408,6 +409,29 @@ void isPrimitiveOrWrapperWithWrapper(Class<?> type) {
 		assertThat(ClassUtils.isPrimitiveOrWrapper(type)).isTrue();
 	}
 
+	@Test
+	void isLambda() {
+		assertIsLambda(ClassUtilsTests.staticLambdaExpression);
+		assertIsLambda(ClassUtilsTests::staticStringFactory);
+
+		assertIsLambda(this.instanceLambdaExpression);
+		assertIsLambda(this::instanceStringFactory);
+	}
+
+	@Test
+	void isNotLambda() {
+		assertIsNotLambda(new EnigmaSupplier());
+
+		assertIsNotLambda(new Supplier<String>() {
+			@Override
+			public String get() {
+				return "anonymous inner class";
+			}
+		});
+
+		assertIsNotLambda(new Fake$$LambdaSupplier());
+	}
+
 
 	@Nested
 	class GetStaticMethodTests {
@@ -500,4 +524,38 @@ void print(String header, String[] messages, String footer) {
 		}
 	}
 
+	private static void assertIsLambda(Supplier<String> supplier) {
+		assertThat(ClassUtils.isLambdaClass(supplier.getClass())).isTrue();
+	}
+
+	private static void assertIsNotLambda(Supplier<String> supplier) {
+		assertThat(ClassUtils.isLambdaClass(supplier.getClass())).isFalse();
+	}
+
+	private static final Supplier<String> staticLambdaExpression = () -> "static lambda expression";
+
+	private final Supplier<String> instanceLambdaExpression = () -> "instance lambda expressions";
+
+	private static String staticStringFactory() {
+		return "static string factory";
+	}
+
+	private String instanceStringFactory() {
+		return "instance string factory";
+	}
+
+	private static class EnigmaSupplier implements Supplier<String> {
+		@Override
+		public String get() {
+			return "enigma";
+		}
+	}
+
+	private static class Fake$$LambdaSupplier implements Supplier<String> {
+		@Override
+		public String get() {
+			return "fake lambda";
+		}
+	}
+
 }
diff --git a/spring-expression/src/main/java/org/springframework/expression/spel/ast/ConstructorReference.java b/spring-expression/src/main/java/org/springframework/expression/spel/ast/ConstructorReference.java
index 6f4f3c8c69cc..c425c84746ea 100644
--- a/spring-expression/src/main/java/org/springframework/expression/spel/ast/ConstructorReference.java
+++ b/spring-expression/src/main/java/org/springframework/expression/spel/ast/ConstructorReference.java
@@ -288,8 +288,8 @@ private TypedValue createArray(ExpressionState state) throws EvaluationException
 		else {
 			// There is an initializer
 			if (this.dimensions == null || this.dimensions.length > 1) {
-				// There is an initializer but this is a multi-dimensional array (e.g. new int[][]{{1,2},{3,4}}) - this
-				// is not currently supported
+				// There is an initializer but this is a multi-dimensional array (e.g. new int[][]{{1,2},{3,4}})
+				// - this is not currently supported
 				throw new SpelEvaluationException(getStartPosition(),
 						SpelMessage.MULTIDIM_ARRAY_INITIALIZER_NOT_SUPPORTED);
 			}
diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/core/DataClassRowMapper.java b/spring-jdbc/src/main/java/org/springframework/jdbc/core/DataClassRowMapper.java
index 7e09fcbe8919..274bfdfa0cbf 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/core/DataClassRowMapper.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/core/DataClassRowMapper.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -98,9 +98,18 @@ protected T constructMappedInstance(ResultSet rs, TypeConverter tc) throws SQLEx
 		if (this.constructorParameterNames != null && this.constructorParameterTypes != null) {
 			args = new Object[this.constructorParameterNames.length];
 			for (int i = 0; i < args.length; i++) {
-				String name = underscoreName(this.constructorParameterNames[i]);
+				String name = this.constructorParameterNames[i];
+				int index;
+				try {
+					// Try direct name match first
+					index = rs.findColumn(lowerCaseName(name));
+				}
+				catch (SQLException ex) {
+					// Try underscored name match instead
+					index = rs.findColumn(underscoreName(name));
+				}
 				TypeDescriptor td = this.constructorParameterTypes[i];
-				Object value = getColumnValue(rs, rs.findColumn(name), td.getType());
+				Object value = getColumnValue(rs, index, td.getType());
 				args[i] = tc.convertIfNecessary(value, td.getType(), td);
 			}
 		}
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/AbstractRowMapperTests.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/AbstractRowMapperTests.java
index 1c0a86ffed97..cf9d5817b0c0 100644
--- a/spring-jdbc/src/test/java/org/springframework/jdbc/core/AbstractRowMapperTests.java
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/AbstractRowMapperTests.java
@@ -20,6 +20,7 @@
 import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
 import java.sql.SQLFeatureNotSupportedException;
 import java.sql.Statement;
 import java.sql.Timestamp;
@@ -63,7 +64,7 @@ protected void verifyPerson(Person person) {
 	protected void verifyPerson(ConcretePerson person) {
 		assertThat(person.getName()).isEqualTo("Bubba");
 		assertThat(person.getAge()).isEqualTo(22L);
-		assertThat(person.getBirth_date()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		assertThat(person.getBirthDate()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(person.getBalance()).isEqualTo(new BigDecimal("1234.56"));
 		verifyPersonViaBeanWrapper(person);
 	}
@@ -94,7 +95,14 @@ private void verifyPersonViaBeanWrapper(Object person) {
 		BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(person);
 		assertThat(bw.getPropertyValue("name")).isEqualTo("Bubba");
 		assertThat(bw.getPropertyValue("age")).isEqualTo(22L);
-		assertThat((Date) bw.getPropertyValue("birth_date")).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		Date birthDate;
+		if (bw.isReadableProperty("birth_date")) {
+			birthDate = (Date) bw.getPropertyValue("birth_date");
+		}
+		else {
+			birthDate = (Date) bw.getPropertyValue("birthDate");
+		}
+		assertThat(birthDate).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(bw.getPropertyValue("balance")).isEqualTo(new BigDecimal("1234.56"));
 	}
 
@@ -107,7 +115,7 @@ protected void verifyPerson(EmailPerson person) {
 	}
 
 
-	protected enum MockType {ONE, TWO, THREE}
+	protected enum MockType {ONE, TWO, THREE, FOUR}
 
 
 	protected static class Mock {
@@ -152,13 +160,19 @@ public Mock(MockType type) throws Exception {
 			given(resultSetMetaData.getColumnLabel(1)).willReturn(
 					type == MockType.THREE ? "Last Name" : "name");
 			given(resultSetMetaData.getColumnLabel(2)).willReturn("age");
-			given(resultSetMetaData.getColumnLabel(3)).willReturn("birth_date");
+			given(resultSetMetaData.getColumnLabel(3)).willReturn(type == MockType.FOUR ? "birthdate" :"birth_date");
 			given(resultSetMetaData.getColumnLabel(4)).willReturn("balance");
 			given(resultSetMetaData.getColumnLabel(5)).willReturn("e_mail");
 
 			given(resultSet.findColumn("name")).willReturn(1);
 			given(resultSet.findColumn("age")).willReturn(2);
-			given(resultSet.findColumn("birth_date")).willReturn(3);
+			if (type == MockType.FOUR) {
+				given(resultSet.findColumn("birthdate")).willReturn(3);
+			}
+			else {
+				given(resultSet.findColumn("birthdate")).willThrow(new SQLException());
+				given(resultSet.findColumn("birth_date")).willReturn(3);
+			}
 			given(resultSet.findColumn("balance")).willReturn(4);
 			given(resultSet.findColumn("e_mail")).willReturn(5);
 
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/BeanPropertyRowMapperTests.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/BeanPropertyRowMapperTests.java
index 99e9eb416274..5ef1f57f8916 100644
--- a/spring-jdbc/src/test/java/org/springframework/jdbc/core/BeanPropertyRowMapperTests.java
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/BeanPropertyRowMapperTests.java
@@ -140,6 +140,17 @@ void queryWithSpaceInColumnNameAndLocalDate() throws Exception {
 		mock.verifyClosed();
 	}
 
+	@Test
+	void queryWithDirectNameMatchOnBirthDate() throws Exception {
+		Mock mock = new Mock(MockType.FOUR);
+		List<ConcretePerson> result = mock.getJdbcTemplate().query(
+				"select name, age, birthdate, balance from people",
+				new BeanPropertyRowMapper<>(ConcretePerson.class));
+		assertThat(result).hasSize(1);
+		verifyPerson(result.get(0));
+		mock.verifyClosed();
+	}
+
 	@Test
 	void queryWithUnderscoreInColumnNameAndPersonWithMultipleAdjacentUppercaseLettersInPropertyName() throws Exception {
 		Mock mock = new Mock();
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/DataClassRowMapperTests.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/DataClassRowMapperTests.java
index 48b0f7f03134..c612e5bcae63 100644
--- a/spring-jdbc/src/test/java/org/springframework/jdbc/core/DataClassRowMapperTests.java
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/DataClassRowMapperTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -57,7 +57,7 @@ public void testStaticQueryWithDataClassAndGenerics() throws Exception {
 		ConstructorPersonWithGenerics person = result.get(0);
 		assertThat(person.name()).isEqualTo("Bubba");
 		assertThat(person.age()).isEqualTo(22L);
-		assertThat(person.birth_date()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		assertThat(person.birthDate()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(person.balance()).isEqualTo(Collections.singletonList(new BigDecimal("1234.56")));
 
 		mock.verifyClosed();
@@ -65,15 +65,15 @@ public void testStaticQueryWithDataClassAndGenerics() throws Exception {
 
 	@Test
 	public void testStaticQueryWithDataClassAndSetters() throws Exception {
-		Mock mock = new Mock();
+		Mock mock = new Mock(MockType.FOUR);
 		List<ConstructorPersonWithSetters> result = mock.getJdbcTemplate().query(
-				"select name, age, birth_date, balance from people",
+				"select name, age, birthdate, balance from people",
 				new DataClassRowMapper<>(ConstructorPersonWithSetters.class));
 		assertThat(result.size()).isEqualTo(1);
 		ConstructorPersonWithSetters person = result.get(0);
 		assertThat(person.name()).isEqualTo("BUBBA");
 		assertThat(person.age()).isEqualTo(22L);
-		assertThat(person.birth_date()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		assertThat(person.birthDate()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(person.balance()).isEqualTo(new BigDecimal("1234.56"));
 
 		mock.verifyClosed();
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/AbstractPerson.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/AbstractPerson.java
index f2698d3073ac..b084644c6896 100644
--- a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/AbstractPerson.java
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/AbstractPerson.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -27,7 +27,7 @@ public abstract class AbstractPerson {
 
 	private long age;
 
-	private Date birth_date;
+	private Date birthDate;
 
 
 	public String getName() {
@@ -46,12 +46,12 @@ public void setAge(long age) {
 		this.age = age;
 	}
 
-	public Date getBirth_date() {
-		return birth_date;
+	public Date getBirthDate() {
+		return birthDate;
 	}
 
-	public void setBirth_date(Date birth_date) {
-		this.birth_date = birth_date;
+	public void setBirthDate(Date birthDate) {
+		this.birthDate = birthDate;
 	}
 
 }
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithGenerics.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithGenerics.java
index 3ae8e271c810..289197b56392 100644
--- a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithGenerics.java
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithGenerics.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -29,7 +29,7 @@ public class ConstructorPersonWithGenerics {
 
 	private final long age;
 
-	private final Date birth_date;
+	private final Date birthDate;
 
 	private final List<BigDecimal> balance;
 
@@ -37,7 +37,7 @@ public class ConstructorPersonWithGenerics {
 	public ConstructorPersonWithGenerics(String name, long age, Date birth_date, List<BigDecimal> balance) {
 		this.name = name;
 		this.age = age;
-		this.birth_date = birth_date;
+		this.birthDate = birth_date;
 		this.balance = balance;
 	}
 
@@ -50,8 +50,8 @@ public long age() {
 		return this.age;
 	}
 
-	public Date birth_date() {
-		return this.birth_date;
+	public Date birthDate() {
+		return this.birthDate;
 	}
 
 	public List<BigDecimal> balance() {
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithSetters.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithSetters.java
index ef1feb9a324d..0776b5cc48ab 100644
--- a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithSetters.java
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithSetters.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -28,15 +28,15 @@ public class ConstructorPersonWithSetters {
 
 	private long age;
 
-	private Date birth_date;
+	private Date birthDate;
 
 	private BigDecimal balance;
 
 
-	public ConstructorPersonWithSetters(String name, long age, Date birth_date, BigDecimal balance) {
+	public ConstructorPersonWithSetters(String name, long age, Date birthDate, BigDecimal balance) {
 		this.name = name.toUpperCase();
 		this.age = age;
-		this.birth_date = birth_date;
+		this.birthDate = birthDate;
 		this.balance = balance;
 	}
 
@@ -49,8 +49,8 @@ public void setAge(long age) {
 		this.age = age;
 	}
 
-	public void setBirth_date(Date birth_date) {
-		this.birth_date = birth_date;
+	public void setBirthDate(Date birthDate) {
+		this.birthDate = birthDate;
 	}
 
 	public void setBalance(BigDecimal balance) {
@@ -65,8 +65,8 @@ public long age() {
 		return this.age;
 	}
 
-	public Date birth_date() {
-		return this.birth_date;
+	public Date birthDate() {
+		return this.birthDate;
 	}
 
 	public BigDecimal balance() {
diff --git a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/SpacePerson.java b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/SpacePerson.java
index 8dc8875e15c8..2fc59db1b2e6 100644
--- a/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/SpacePerson.java
+++ b/spring-jdbc/src/test/java/org/springframework/jdbc/core/test/SpacePerson.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -60,8 +60,8 @@ public BigDecimal getBalance() {
 		return balance;
 	}
 
-	public void setBalance(BigDecimal balanace) {
-		this.balance = balanace;
+	public void setBalance(BigDecimal balance) {
+		this.balance = balance;
 	}
 
 }
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/handler/HandlerMethod.java b/spring-messaging/src/main/java/org/springframework/messaging/handler/HandlerMethod.java
index 4ace844929fb..7a834c5d2f07 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/handler/HandlerMethod.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/handler/HandlerMethod.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -420,21 +420,21 @@ public HandlerMethodParameter clone() {
 	private class ReturnValueMethodParameter extends HandlerMethodParameter {
 
 		@Nullable
-		private final Object returnValue;
+		private final Class<?> returnValueType;
 
 		public ReturnValueMethodParameter(@Nullable Object returnValue) {
 			super(-1);
-			this.returnValue = returnValue;
+			this.returnValueType = (returnValue != null ? returnValue.getClass() : null);
 		}
 
 		protected ReturnValueMethodParameter(ReturnValueMethodParameter original) {
 			super(original);
-			this.returnValue = original.returnValue;
+			this.returnValueType = original.returnValueType;
 		}
 
 		@Override
 		public Class<?> getParameterType() {
-			return (this.returnValue != null ? this.returnValue.getClass() : super.getParameterType());
+			return (this.returnValueType != null ? this.returnValueType : super.getParameterType());
 		}
 
 		@Override
diff --git a/spring-web/src/main/java/org/springframework/http/MediaType.java b/spring-web/src/main/java/org/springframework/http/MediaType.java
index 729555add951..2a784e0386b1 100644
--- a/spring-web/src/main/java/org/springframework/http/MediaType.java
+++ b/spring-web/src/main/java/org/springframework/http/MediaType.java
@@ -95,6 +95,17 @@ public class MediaType extends MimeType implements Serializable {
 	 */
 	public static final String APPLICATION_FORM_URLENCODED_VALUE = "application/x-www-form-urlencoded";
 
+	/**
+	 * Public constant media type for {@code application/graphql+json}.
+	 * @see <a href="https://github.com/graphql/graphql-over-http">GraphQL over HTTP spec</a>
+	 */
+	public static final MediaType APPLICATION_GRAPHQL;
+
+	/**
+	 * A String equivalent of {@link MediaType#APPLICATION_GRAPHQL}.
+	 */
+	public static final String APPLICATION_GRAPHQL_VALUE = "application/graphql+json";
+
 	/**
 	 * Public constant media type for {@code application/json}.
 	 */
@@ -396,6 +407,7 @@ public class MediaType extends MimeType implements Serializable {
 		APPLICATION_ATOM_XML = new MediaType("application", "atom+xml");
 		APPLICATION_CBOR = new MediaType("application", "cbor");
 		APPLICATION_FORM_URLENCODED = new MediaType("application", "x-www-form-urlencoded");
+		APPLICATION_GRAPHQL = new MediaType("application", "graphql+json");
 		APPLICATION_JSON = new MediaType("application", "json");
 		APPLICATION_JSON_UTF8 = new MediaType("application", "json", StandardCharsets.UTF_8);
 		APPLICATION_NDJSON = new MediaType("application", "x-ndjson");
diff --git a/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartParser.java b/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartParser.java
index ff1344424aa6..7ef9e9aa9e44 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartParser.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartParser.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -105,7 +105,7 @@ public static Flux<Token> parse(Flux<DataBuffer> buffers, byte[] boundary, int m
 
 	@Override
 	public Context currentContext() {
-		return this.sink.currentContext();
+		return Context.of(this.sink.contextView());
 	}
 
 	@Override
diff --git a/spring-web/src/main/java/org/springframework/http/codec/multipart/PartGenerator.java b/spring-web/src/main/java/org/springframework/http/codec/multipart/PartGenerator.java
index 88d689d90e9b..484a09c6adba 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/multipart/PartGenerator.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/multipart/PartGenerator.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -116,7 +116,7 @@ public static Flux<Part> createParts(Flux<MultipartParser.Token> tokens, int max
 
 	@Override
 	public Context currentContext() {
-		return this.sink.currentContext();
+		return Context.of(this.sink.contextView());
 	}
 
 	@Override
diff --git a/spring-web/src/main/java/org/springframework/http/server/ServletServerHttpRequest.java b/spring-web/src/main/java/org/springframework/http/server/ServletServerHttpRequest.java
index 82f722310c3b..45ce146f2ef8 100644
--- a/spring-web/src/main/java/org/springframework/http/server/ServletServerHttpRequest.java
+++ b/spring-web/src/main/java/org/springframework/http/server/ServletServerHttpRequest.java
@@ -197,7 +197,7 @@ public Principal getPrincipal() {
 
 	@Override
 	public InetSocketAddress getLocalAddress() {
-		return new InetSocketAddress(this.servletRequest.getLocalName(), this.servletRequest.getLocalPort());
+		return new InetSocketAddress(this.servletRequest.getLocalAddr(), this.servletRequest.getLocalPort());
 	}
 
 	@Override
diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java b/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java
index 0845a9f25f04..de1f3ca5a600 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -26,6 +26,8 @@
 import org.reactivestreams.Subscription;
 import reactor.core.publisher.Operators;
 
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DefaultDataBufferFactory;
 import org.springframework.core.log.LogDelegateFactory;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
@@ -56,6 +58,8 @@ public abstract class AbstractListenerReadPublisher<T> implements Publisher<T> {
 	 */
 	protected static Log rsReadLogger = LogDelegateFactory.getHiddenLog(AbstractListenerReadPublisher.class);
 
+	final static DataBuffer EMPTY_BUFFER = DefaultDataBufferFactory.sharedInstance.allocateBuffer(0);
+
 
 	private final AtomicReference<State> state = new AtomicReference<>(State.UNSUBSCRIBED);
 
@@ -180,7 +184,7 @@ public final void onError(Throwable ex) {
 
 	/**
 	 * Read and publish data one at a time until there is no more data, no more
-	 * demand, or perhaps we completed in the mean time.
+	 * demand, or perhaps we completed meanwhile.
 	 * @return {@code true} if there is more demand; {@code false} if there is
 	 * no more demand or we have completed.
 	 */
@@ -188,7 +192,12 @@ private boolean readAndPublish() throws IOException {
 		long r;
 		while ((r = this.demand) > 0 && (this.state.get() != State.COMPLETED)) {
 			T data = read();
-			if (data != null) {
+			if (data == EMPTY_BUFFER) {
+				if (rsReadLogger.isTraceEnabled()) {
+					rsReadLogger.trace(getLogPrefix() + "0 bytes read, trying again");
+				}
+			}
+			else if (data != null) {
 				if (r != Long.MAX_VALUE) {
 					DEMAND_FIELD_UPDATER.addAndGet(this, -1L);
 				}
diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpRequest.java b/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpRequest.java
index a84ddc6d6e3d..51fa59839afb 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpRequest.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpRequest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -198,7 +198,7 @@ public InetSocketAddress getRemoteAddress() {
 	@Nullable
 	protected SslInfo initSslInfo() {
 		X509Certificate[] certificates = getX509Certificates();
-		return certificates != null ? new DefaultSslInfo(getSslSessionId(), certificates) : null;
+		return (certificates != null ? new DefaultSslInfo(getSslSessionId(), certificates) : null);
 	}
 
 	@Nullable
@@ -208,8 +208,7 @@ private String getSslSessionId() {
 
 	@Nullable
 	private X509Certificate[] getX509Certificates() {
-		String name = "javax.servlet.request.X509Certificate";
-		return (X509Certificate[]) this.request.getAttribute(name);
+		return (X509Certificate[]) this.request.getAttribute("javax.servlet.request.X509Certificate");
 	}
 
 	@Override
@@ -236,10 +235,10 @@ AsyncListener getAsyncListener() {
 	/**
 	 * Read from the request body InputStream and return a DataBuffer.
 	 * Invoked only when {@link ServletInputStream#isReady()} returns "true".
-	 * @return a DataBuffer with data read, or {@link #EOF_BUFFER} if the input
-	 * stream returned -1, or null if 0 bytes were read.
+	 * @return a DataBuffer with data read, or
+	 * {@link AbstractListenerReadPublisher#EMPTY_BUFFER} if 0 bytes were read,
+	 * or {@link #EOF_BUFFER} if the input stream returned -1.
 	 */
-	@Nullable
 	DataBuffer readFromInputStream() throws IOException {
 		int read = this.request.getInputStream().read(this.buffer);
 		logBytesRead(read);
@@ -254,7 +253,7 @@ DataBuffer readFromInputStream() throws IOException {
 			return EOF_BUFFER;
 		}
 
-		return null;
+		return AbstractListenerReadPublisher.EMPTY_BUFFER;
 	}
 
 	protected final void logBytesRead(int read) {
diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java b/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java
index 7920c7ffd8b4..b8c78fdbf4e4 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java
@@ -153,7 +153,7 @@ else if (read == -1) {
 					return EOF_BUFFER;
 				}
 				else {
-					return null;
+					return AbstractListenerReadPublisher.EMPTY_BUFFER;
 				}
 			}
 			finally {
diff --git a/spring-web/src/main/java/org/springframework/web/bind/ServletRequestDataBinder.java b/spring-web/src/main/java/org/springframework/web/bind/ServletRequestDataBinder.java
index 16bf30ee01fc..864e21843984 100644
--- a/spring-web/src/main/java/org/springframework/web/bind/ServletRequestDataBinder.java
+++ b/spring-web/src/main/java/org/springframework/web/bind/ServletRequestDataBinder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -33,6 +33,15 @@
  * Special {@link org.springframework.validation.DataBinder} to perform data binding
  * from servlet request parameters to JavaBeans, including support for multipart files.
  *
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
+ *
  * <p>See the DataBinder/WebDataBinder superclasses for customization options,
  * which include specifying allowed/required fields, and registering custom
  * property editors.
diff --git a/spring-web/src/main/java/org/springframework/web/bind/WebDataBinder.java b/spring-web/src/main/java/org/springframework/web/bind/WebDataBinder.java
index a1cd50ad7443..754f72ac5493 100644
--- a/spring-web/src/main/java/org/springframework/web/bind/WebDataBinder.java
+++ b/spring-web/src/main/java/org/springframework/web/bind/WebDataBinder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -34,6 +34,15 @@
  * the Servlet API; serves as base class for more specific DataBinder variants,
  * such as {@link org.springframework.web.bind.ServletRequestDataBinder}.
  *
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
+ *
  * <p>Includes support for field markers which address a common problem with
  * HTML checkboxes and select options: detecting that a field was part of
  * the form, but did not generate a request parameter because it was empty.
diff --git a/spring-web/src/main/java/org/springframework/web/bind/annotation/ExceptionHandler.java b/spring-web/src/main/java/org/springframework/web/bind/annotation/ExceptionHandler.java
index 3f48fa431185..467d9853ef2e 100644
--- a/spring-web/src/main/java/org/springframework/web/bind/annotation/ExceptionHandler.java
+++ b/spring-web/src/main/java/org/springframework/web/bind/annotation/ExceptionHandler.java
@@ -100,6 +100,7 @@
  * @author Arjen Poutsma
  * @author Juergen Hoeller
  * @since 3.0
+ * @see ControllerAdvice
  * @see org.springframework.web.context.request.WebRequest
  */
 @Target(ElementType.METHOD)
diff --git a/spring-web/src/main/java/org/springframework/web/bind/annotation/InitBinder.java b/spring-web/src/main/java/org/springframework/web/bind/annotation/InitBinder.java
index 5fc5d6bcc279..370b2f2801e0 100644
--- a/spring-web/src/main/java/org/springframework/web/bind/annotation/InitBinder.java
+++ b/spring-web/src/main/java/org/springframework/web/bind/annotation/InitBinder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -23,15 +23,24 @@
 import java.lang.annotation.Target;
 
 /**
- * Annotation that identifies methods which initialize the
+ * Annotation that identifies methods that initialize the
  * {@link org.springframework.web.bind.WebDataBinder} which
  * will be used for populating command and form object arguments
  * of annotated handler methods.
  *
- * <p>Such init-binder methods support all arguments that {@link RequestMapping}
- * supports, except for command/form objects and corresponding validation result
- * objects. Init-binder methods must not have a return value; they are usually
- * declared as {@code void}.
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
+ *
+ * <p>{@code @InitBinder} methods support all arguments that
+ * {@link RequestMapping @RequestMapping} methods support, except for command/form
+ * objects and corresponding validation result objects. {@code @InitBinder} methods
+ * must not have a return value; they are usually declared as {@code void}.
  *
  * <p>Typical arguments are {@link org.springframework.web.bind.WebDataBinder}
  * in combination with {@link org.springframework.web.context.request.WebRequest}
@@ -39,6 +48,7 @@
  *
  * @author Juergen Hoeller
  * @since 2.5
+ * @see ControllerAdvice
  * @see org.springframework.web.bind.WebDataBinder
  * @see org.springframework.web.context.request.WebRequest
  */
diff --git a/spring-web/src/main/java/org/springframework/web/bind/annotation/ModelAttribute.java b/spring-web/src/main/java/org/springframework/web/bind/annotation/ModelAttribute.java
index 717a6d0106ef..3316065a0760 100644
--- a/spring-web/src/main/java/org/springframework/web/bind/annotation/ModelAttribute.java
+++ b/spring-web/src/main/java/org/springframework/web/bind/annotation/ModelAttribute.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -31,18 +31,27 @@
  * for controller classes with {@link RequestMapping @RequestMapping}
  * methods.
  *
- * <p>Can be used to expose command objects to a web view, using
- * specific attribute names, through annotating corresponding
- * parameters of an {@link RequestMapping @RequestMapping} method.
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
  *
- * <p>Can also be used to expose reference data to a web view
- * through annotating accessor methods in a controller class with
+ * <p>{@code @ModelAttribute} can be used to expose command objects to a web view,
+ * using specific attribute names, by annotating corresponding parameters of an
+ * {@link RequestMapping @RequestMapping} method.
+ *
+ * <p>{@code @ModelAttribute} can also be used to expose reference data to a web
+ * view by annotating accessor methods in a controller class with
  * {@link RequestMapping @RequestMapping} methods. Such accessor
  * methods are allowed to have any arguments that
  * {@link RequestMapping @RequestMapping} methods support, returning
  * the model attribute value to expose.
  *
- * <p>Note however that reference data and all other model content is
+ * <p>Note however that reference data and all other model content are
  * not available to web views when request processing results in an
  * {@code Exception} since the exception could be raised at any time
  * making the content of the model unreliable. For this reason
@@ -52,6 +61,7 @@
  * @author Juergen Hoeller
  * @author Rossen Stoyanchev
  * @since 2.5
+ * @see ControllerAdvice
  */
 @Target({ElementType.PARAMETER, ElementType.METHOD})
 @Retention(RetentionPolicy.RUNTIME)
@@ -77,7 +87,7 @@
 	String name() default "";
 
 	/**
-	 * Allows declaring data binding disabled directly on an {@code @ModelAttribute}
+	 * Allows data binding to be disabled directly on an {@code @ModelAttribute}
 	 * method parameter or on the attribute returned from an {@code @ModelAttribute}
 	 * method, both of which would prevent data binding for that attribute.
 	 * <p>By default this is set to {@code true} in which case data binding applies.
diff --git a/spring-web/src/main/java/org/springframework/web/bind/support/WebExchangeDataBinder.java b/spring-web/src/main/java/org/springframework/web/bind/support/WebExchangeDataBinder.java
index ed7855e79097..b4957970a5d2 100644
--- a/spring-web/src/main/java/org/springframework/web/bind/support/WebExchangeDataBinder.java
+++ b/spring-web/src/main/java/org/springframework/web/bind/support/WebExchangeDataBinder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -36,6 +36,15 @@
  * Specialized {@link org.springframework.validation.DataBinder} to perform data
  * binding from URL query parameters or form data in the request data to Java objects.
  *
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
+ *
  * @author Rossen Stoyanchev
  * @author Juergen Hoeller
  * @since 5.0
diff --git a/spring-web/src/main/java/org/springframework/web/bind/support/WebRequestDataBinder.java b/spring-web/src/main/java/org/springframework/web/bind/support/WebRequestDataBinder.java
index 76ea4abddab4..805667f69b87 100644
--- a/spring-web/src/main/java/org/springframework/web/bind/support/WebRequestDataBinder.java
+++ b/spring-web/src/main/java/org/springframework/web/bind/support/WebRequestDataBinder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -35,6 +35,15 @@
  * Special {@link org.springframework.validation.DataBinder} to perform data binding
  * from web request parameters to JavaBeans, including support for multipart files.
  *
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
+ *
  * <p>See the DataBinder/WebDataBinder superclasses for customization options,
  * which include specifying allowed/required fields, and registering custom
  * property editors.
diff --git a/spring-web/src/main/java/org/springframework/web/method/HandlerMethod.java b/spring-web/src/main/java/org/springframework/web/method/HandlerMethod.java
index 80d6e7999eb4..ca859130f69f 100644
--- a/spring-web/src/main/java/org/springframework/web/method/HandlerMethod.java
+++ b/spring-web/src/main/java/org/springframework/web/method/HandlerMethod.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -582,21 +582,21 @@ public HandlerMethodParameter clone() {
 	private class ReturnValueMethodParameter extends HandlerMethodParameter {
 
 		@Nullable
-		private final Object returnValue;
+		private final Class<?> returnValueType;
 
 		public ReturnValueMethodParameter(@Nullable Object returnValue) {
 			super(-1);
-			this.returnValue = returnValue;
+			this.returnValueType = (returnValue != null ? returnValue.getClass() : null);
 		}
 
 		protected ReturnValueMethodParameter(ReturnValueMethodParameter original) {
 			super(original);
-			this.returnValue = original.returnValue;
+			this.returnValueType = original.returnValueType;
 		}
 
 		@Override
 		public Class<?> getParameterType() {
-			return (this.returnValue != null ? this.returnValue.getClass() : super.getParameterType());
+			return (this.returnValueType != null ? this.returnValueType : super.getParameterType());
 		}
 
 		@Override
diff --git a/spring-web/src/test/java/org/springframework/http/codec/json/Jackson2JsonEncoderTests.java b/spring-web/src/test/java/org/springframework/http/codec/json/Jackson2JsonEncoderTests.java
index 2e589ac2a8f8..b66084e8299a 100644
--- a/spring-web/src/test/java/org/springframework/http/codec/json/Jackson2JsonEncoderTests.java
+++ b/spring-web/src/test/java/org/springframework/http/codec/json/Jackson2JsonEncoderTests.java
@@ -103,7 +103,7 @@ public void encode() throws Exception {
 		);
 	}
 
-	@Test // SPR-15866
+	@Test  // SPR-15866
 	public void canEncodeWithCustomMimeType() {
 		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
 		Jackson2JsonEncoder encoder = new Jackson2JsonEncoder(new ObjectMapper(), textJavascript);
@@ -231,9 +231,8 @@ public void jacksonValue() {
 		);
 	}
 
-	@Test // gh-28045
+	@Test  // gh-28045
 	public void jacksonValueUnwrappedBeforeObjectMapperSelection() {
-
 		JacksonViewBean bean = new JacksonViewBean();
 		bean.setWithView1("with");
 		bean.setWithView2("with");
@@ -248,13 +247,15 @@ public void jacksonValueUnwrappedBeforeObjectMapperSelection() {
 		ObjectMapper mapper = new ObjectMapper().configure(SerializationFeature.INDENT_OUTPUT, true);
 		this.encoder.registerObjectMappersForType(JacksonViewBean.class, map -> map.put(halMediaType, mapper));
 
+		String ls = System.lineSeparator();  // output below is different between Unix and Windows
 		testEncode(Mono.just(jacksonValue), type, halMediaType, Collections.emptyMap(), step -> step
-				.consumeNextWith(expectString("{\n  \"withView1\" : \"with\"\n}").andThen(DataBufferUtils::release))
+				.consumeNextWith(expectString("{" + ls + "  \"withView1\" : \"with\"" + ls + "}")
+						.andThen(DataBufferUtils::release))
 				.verifyComplete()
 		);
 	}
 
-	@Test // gh-22771
+	@Test  // gh-22771
 	public void encodeWithFlushAfterWriteOff() {
 		ObjectMapper mapper = new ObjectMapper();
 		mapper.configure(SerializationFeature.FLUSH_AFTER_WRITE_VALUE, false);
diff --git a/spring-web/src/test/java/org/springframework/web/method/annotation/InitBinderDataBinderFactoryTests.java b/spring-web/src/test/java/org/springframework/web/method/annotation/InitBinderDataBinderFactoryTests.java
index 1126d2bf2516..ce284f935e71 100644
--- a/spring-web/src/test/java/org/springframework/web/method/annotation/InitBinderDataBinderFactoryTests.java
+++ b/spring-web/src/test/java/org/springframework/web/method/annotation/InitBinderDataBinderFactoryTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -116,7 +116,7 @@ public void createBinderTypeConversion() throws Exception {
 		WebDataBinder dataBinder = factory.createBinder(this.webRequest, null, "foo");
 
 		assertThat(dataBinder.getDisallowedFields()).isNotNull();
-		assertThat(dataBinder.getDisallowedFields()[0]).isEqualTo("requestParam-22");
+		assertThat(dataBinder.getDisallowedFields()[0]).isEqualToIgnoringCase("requestParam-22");
 	}
 
 	private WebDataBinderFactory createFactory(String methodName, Class<?>... parameterTypes)
diff --git a/spring-web/src/test/java/org/springframework/web/method/annotation/ModelAttributeMethodProcessorTests.java b/spring-web/src/test/java/org/springframework/web/method/annotation/ModelAttributeMethodProcessorTests.java
index bc3be0e7aa99..c3ab1ed07256 100644
--- a/spring-web/src/test/java/org/springframework/web/method/annotation/ModelAttributeMethodProcessorTests.java
+++ b/spring-web/src/test/java/org/springframework/web/method/annotation/ModelAttributeMethodProcessorTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -269,7 +269,7 @@ public void handleNotAnnotatedReturnValue() throws Exception {
 		assertThat(this.container.getModel().get("testBean")).isSameAs(testBean);
 	}
 
-	@Test // gh-25182
+	@Test  // gh-25182
 	public void resolveConstructorListArgumentFromCommaSeparatedRequestParameter() throws Exception {
 		MockHttpServletRequest mockRequest = new MockHttpServletRequest();
 		mockRequest.addParameter("listOfStrings", "1,2");
@@ -279,7 +279,6 @@ public void resolveConstructorListArgumentFromCommaSeparatedRequestParameter() t
 		given(factory.createBinder(any(), any(), eq("testBeanWithConstructorArgs")))
 				.willAnswer(invocation -> {
 					WebRequestDataBinder binder = new WebRequestDataBinder(invocation.getArgument(1));
-
 					// Add conversion service which will convert "1,2" to a list
 					binder.setConversionService(new DefaultFormattingConversionService());
 					return binder;
@@ -309,7 +308,6 @@ private static class StubRequestDataBinder extends WebRequestDataBinder {
 
 		private boolean validateInvoked;
 
-
 		public StubRequestDataBinder(Object target, String objectName) {
 			super(target, objectName);
 		}
@@ -345,7 +343,7 @@ public void validate(Object... validationHints) {
 	}
 
 
-	@SessionAttributes(types=TestBean.class)
+	@SessionAttributes(types = TestBean.class)
 	private static class ModelAttributeHandler {
 
 		@SuppressWarnings("unused")
@@ -360,6 +358,7 @@ public void modelAttribute(
 		}
 	}
 
+
 	static class TestBeanWithConstructorArgs {
 
 		final List<String> listOfStrings;
@@ -367,15 +366,15 @@ static class TestBeanWithConstructorArgs {
 		public TestBeanWithConstructorArgs(List<String> listOfStrings) {
 			this.listOfStrings = listOfStrings;
 		}
-
 	}
 
-	@ModelAttribute("modelAttrName") @SuppressWarnings("unused")
+
+	@ModelAttribute("modelAttrName")
+	@SuppressWarnings("unused")
 	private String annotatedReturnValue() {
 		return null;
 	}
 
-
 	@SuppressWarnings("unused")
 	private TestBean notAnnotatedReturnValue() {
 		return null;
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/InitBinderBindingContextTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/InitBinderBindingContextTests.java
index 56ba84873cca..d695a3f750c6 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/InitBinderBindingContextTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/InitBinderBindingContextTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -121,7 +121,7 @@ public void createBinderTypeConversion() throws Exception {
 		WebDataBinder dataBinder = context.createDataBinder(exchange, null, "foo");
 
 		assertThat(dataBinder.getDisallowedFields()).isNotNull();
-		assertThat(dataBinder.getDisallowedFields()[0]).isEqualTo("requestParam-22");
+		assertThat(dataBinder.getDisallowedFields()[0]).isEqualToIgnoringCase("requestParam-22");
 	}
 
 
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/MultipartIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/MultipartIntegrationTests.java
index 9f83dff6601b..b60587452ac1 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/MultipartIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/MultipartIntegrationTests.java
@@ -25,7 +25,6 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
-import org.junit.jupiter.api.Disabled;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.core.scheduler.Schedulers;
@@ -63,7 +62,6 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assumptions.assumeFalse;
 
-@Disabled
 class MultipartIntegrationTests extends AbstractHttpHandlerIntegrationTests {
 
 	private WebClient webClient;
diff --git a/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt b/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt
index 56e25eb9fc51..18ab6e1dda78 100644
--- a/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt
+++ b/spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/CoroutinesIntegrationTests.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -24,7 +24,6 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.api.Assertions.assertThatExceptionOfType
-import org.junit.jupiter.api.Disabled
 import org.springframework.context.ApplicationContext
 import org.springframework.context.annotation.AnnotationConfigApplicationContext
 import org.springframework.context.annotation.ComponentScan
@@ -40,7 +39,6 @@ import org.springframework.web.testfixture.http.server.reactive.bootstrap.HttpSe
 import reactor.core.publisher.Flux
 import java.time.Duration
 
-@Disabled
 class CoroutinesIntegrationTests : AbstractRequestMappingIntegrationTests() {
 
 	override fun initApplicationContext(): ApplicationContext {
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodProcessor.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodProcessor.java
index 158a33b9c918..8152b9194744 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodProcessor.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodProcessor.java
@@ -242,12 +242,12 @@ protected <T> void writeWithMessageConverters(@Nullable T value, MethodParameter
 				}
 			}
 			if (mediaTypesToUse.isEmpty()) {
-				if (body != null) {
-					throw new HttpMediaTypeNotAcceptableException(producibleTypes);
-				}
 				if (logger.isDebugEnabled()) {
 					logger.debug("No match for " + acceptableTypes + ", supported: " + producibleTypes);
 				}
+				if (body != null) {
+					throw new HttpMediaTypeNotAcceptableException(producibleTypes);
+				}
 				return;
 			}
 
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ExtendedServletRequestDataBinder.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ExtendedServletRequestDataBinder.java
index 2a7489b98176..662f1e722991 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ExtendedServletRequestDataBinder.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ExtendedServletRequestDataBinder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -29,6 +29,15 @@
  * Subclass of {@link ServletRequestDataBinder} that adds URI template variables
  * to the values used for data binding.
  *
+ * <p><strong>WARNING</strong>: Data binding can lead to security issues by exposing
+ * parts of the object graph that are not meant to be accessed or modified by
+ * external clients. Therefore the design and use of data binding should be considered
+ * carefully with regard to security. For more details, please refer to the dedicated
+ * sections on data binding for
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder-model-design">Spring Web MVC</a> and
+ * <a href="https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html#webflux-ann-initbinder-model-design">Spring WebFlux</a>
+ * in the reference manual.
+ *
  * @author Rossen Stoyanchev
  * @since 3.1
  * @see ServletRequestDataBinder
diff --git a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java
index aeaf049adb23..2b9d7125d7d7 100644
--- a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java
+++ b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -2236,6 +2236,7 @@ void routerFunction() throws ServletException, IOException {
 		assertThat(response.getContentAsString()).isEqualTo("foo-body");
 	}
 
+
 	@Controller
 	static class ControllerWithEmptyValueMapping {
 
@@ -3573,7 +3574,6 @@ public void httpHeaders(@RequestHeader HttpHeaders headers, Writer writer) throw
 			assertThat(headers.getContentType()).as("Invalid Content-Type").isEqualTo(new MediaType("text", "html"));
 			multiValueMap(headers, writer);
 		}
-
 	}
 
 	@Controller
diff --git a/src/docs/asciidoc/web/web-data-binding-model-design.adoc b/src/docs/asciidoc/web/web-data-binding-model-design.adoc
new file mode 100644
index 000000000000..352e63d3c6f3
--- /dev/null
+++ b/src/docs/asciidoc/web/web-data-binding-model-design.adoc
@@ -0,0 +1,95 @@
+In the context of web applications, _data binding_ involves the binding of HTTP request
+parameters (that is, form data or query parameters) to properties in a model object and
+its nested objects.
+
+Only `public` properties following the
+https://www.oracle.com/java/technologies/javase/javabeans-spec.html[JavaBeans naming conventions]
+are exposed for data binding — for example, `public String getFirstName()` and
+`public void setFirstName(String)` methods for a `firstName` property.
+
+TIP: The model object, and its nested object graph, is also sometimes referred to as a
+_command object_, _form-backing object_, or _POJO_ (Plain Old Java Object).
+
+By default, Spring permits binding to all public properties in the model object graph.
+This means you need to carefully consider what public properties the model has, since a
+client could target any public property path, even some that are not expected to be
+targeted for a given use case.
+
+For example, given an HTTP form data endpoint, a malicious client could supply values for
+properties that exist in the model object graph but are not part of the HTML form
+presented in the browser. This could lead to data being set on the model object and any
+of its nested objects, that is not expected to be updated.
+
+The recommended approach is to use a _dedicated model object_ that exposes only
+properties that are relevant for the form submission. For example, on a form for changing
+a user's email address, the model object should declare a minimum set of properties such
+as in the following `ChangeEmailForm`.
+
+[source,java,indent=0,subs="verbatim,quotes"]
+----
+	public class ChangeEmailForm {
+
+		private String oldEmailAddress;
+		private String newEmailAddress;
+
+		public void setOldEmailAddress(String oldEmailAddress) {
+			this.oldEmailAddress = oldEmailAddress;
+		}
+
+		public String getOldEmailAddress() {
+			return this.oldEmailAddress;
+		}
+
+		public void setNewEmailAddress(String newEmailAddress) {
+			this.newEmailAddress = newEmailAddress;
+		}
+
+		public String getNewEmailAddress() {
+			return this.newEmailAddress;
+		}
+
+	}
+----
+
+If you cannot or do not want to use a _dedicated model object_ for each data
+binding use case, you **must** limit the properties that are allowed for data binding.
+Ideally, you can achieve this by registering _allowed field patterns_ via the
+`setAllowedFields()` method on `WebDataBinder`.
+
+For example, to register allowed field patterns in your application, you can implement an
+`@InitBinder` method in a `@Controller` or `@ControllerAdvice` component as shown below:
+
+[source,java,indent=0,subs="verbatim,quotes"]
+----
+	@Controller
+	public class ChangeEmailController {
+
+		@InitBinder
+		void initBinder(WebDataBinder binder) {
+			binder.setAllowedFields("oldEmailAddress", "newEmailAddress");
+		}
+
+		// @RequestMapping methods, etc.
+
+	}
+----
+
+In addition to registering allowed patterns, it is also possible to register _disallowed
+field patterns_ via the `setDisallowedFields()` method in `DataBinder` and its subclasses.
+Please note, however, that an "allow list" is safer than a "deny list". Consequently,
+`setAllowedFields()` should be favored over `setDisallowedFields()`.
+
+Note that matching against allowed field patterns is case-sensitive; whereas, matching
+against disallowed field patterns is case-insensitive. In addition, a field matching a
+disallowed pattern will not be accepted even if it also happens to match a pattern in the
+allowed list.
+
+[WARNING]
+====
+It is extremely important to properly configure allowed and disallowed field patterns
+when exposing your domain model directly for data binding purposes. Otherwise, it is a
+big security risk.
+
+Furthermore, it is strongly recommended that you do **not** use types from your domain
+model such as JPA or Hibernate entities as the model object in data binding scenarios.
+====
diff --git a/src/docs/asciidoc/web/webflux.adoc b/src/docs/asciidoc/web/webflux.adoc
index 111980c64616..2276f15aadf9 100644
--- a/src/docs/asciidoc/web/webflux.adoc
+++ b/src/docs/asciidoc/web/webflux.adoc
@@ -3319,6 +3319,11 @@ controller-specific `Formatter` instances, as the following example shows:
 ----
 <1> Adding a custom formatter (a `DateFormatter`, in this case).
 
+[[webflux-ann-initbinder-model-design]]
+==== Model Design
+[.small]#<<web.adoc#mvc-ann-initbinder-model-design, Web MVC>>#
+
+include::web-data-binding-model-design.adoc[]
 
 
 [[webflux-ann-controller-exceptions]]
diff --git a/src/docs/asciidoc/web/webmvc.adoc b/src/docs/asciidoc/web/webmvc.adoc
index 705c33a5d2a7..30a3867b00b6 100644
--- a/src/docs/asciidoc/web/webmvc.adoc
+++ b/src/docs/asciidoc/web/webmvc.adoc
@@ -3751,6 +3751,13 @@ controller-specific `Formatter` implementations, as the following example shows:
 ----
 <1> Defining an `@InitBinder` method on a custom formatter.
 
+[[mvc-ann-initbinder-model-design]]
+==== Model Design
+[.small]#<<web-reactive.adoc#webflux-ann-initbinder-model-design, WebFlux>>#
+
+include::web-data-binding-model-design.adoc[]
+
+
 [[mvc-ann-exceptionhandler]]
 === Exceptions
 [.small]#<<web-reactive.adoc#webflux-ann-controller-exceptions, WebFlux>>#