Release version 5.1.17.RELEASE

Closes gh-25427

(cherry picked from commit 64f4703445)

.github/workflows/gradle-wrapper-validation.yml

@@ -0,0 +1,10 @@
+name: "Validate Gradle Wrapper"
+on: [push, pull_request]
+
+jobs:
+  validation:
+    name: "Validation"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gradle/wrapper-validation-action@v1

build.gradle

@@ -30,22 +30,22 @@ ext {
 
 	aspectjVersion       = "1.9.5"
 	freemarkerVersion    = "2.3.28"
-	groovyVersion        = "2.5.8"
+	groovyVersion        = "2.5.9"
 	hsqldbVersion        = "2.4.1"
 	jackson2Version      = "2.9.9"
-	jettyVersion         = "9.4.25.v20191220"
+	jettyVersion         = "9.4.30.v20200611"
 	junit5Version        = "5.3.2"
 	kotlinVersion        = "1.2.71"
 	log4jVersion         = "2.11.2"
-	nettyVersion         = "4.1.44.Final"
-	reactorVersion       = "Californium-SR15"
+	nettyVersion         = "4.1.51.Final"
+	reactorVersion       = "Californium-SR20"
 	rxjavaVersion        = "1.3.8"
 	rxjavaAdapterVersion = "1.2.1"
-	rxjava2Version       = "2.2.17"
+	rxjava2Version       = "2.2.19"
 	slf4jVersion         = "1.7.30"	  // spring-jcl + consistent 3rd party deps
 	tiles3Version        = "3.0.8"
-	tomcatVersion        = "9.0.30"
-	undertowVersion      = "2.0.29.Final"
+	tomcatVersion        = "9.0.37"
+	undertowVersion      = "2.0.30.Final"
 
 	gradleScriptDir = "${rootProject.projectDir}/gradle"
 	withoutJclOverSlf4j = {
@@ -142,13 +142,13 @@ configure(allprojects) { project ->
 	}
 
 	checkstyle {
-		toolVersion = "8.28"
+		toolVersion = "8.34"
 		configDir = rootProject.file("src/checkstyle")
 	}
 
 	repositories {
+		mavenCentral()
 		maven { url "https://repo.spring.io/libs-release" }
-		mavenLocal()
 	}
 
 	dependencies {

gradle.properties

@@ -1 +1 @@
-version=5.1.13.BUILD-SNAPSHOT
+version=5.1.17.RELEASE

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/ReflectiveAspectJAdvisorFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -76,9 +76,8 @@ public class ReflectiveAspectJAdvisorFactory extends AbstractAspectJAdvisorFacto
 				new InstanceComparator<>(
 						Around.class, Before.class, After.class, AfterReturning.class, AfterThrowing.class),
 				(Converter<Method, Annotation>) method -> {
-					AspectJAnnotation<?> annotation =
-						AbstractAspectJAdvisorFactory.findAspectJAnnotationOnMethod(method);
-					return (annotation != null ? annotation.getAnnotation() : null);
+					AspectJAnnotation<?> ann = AbstractAspectJAdvisorFactory.findAspectJAnnotationOnMethod(method);
+					return (ann != null ? ann.getAnnotation() : null);
 				});
 		Comparator<Method> methodNameComparator = new ConvertingComparator<>(Method::getName);
 		METHOD_COMPARATOR = adviceKindComparator.thenComparing(methodNameComparator);
@@ -153,8 +152,10 @@ public class ReflectiveAspectJAdvisorFactory extends AbstractAspectJAdvisorFacto
 			if (AnnotationUtils.getAnnotation(method, Pointcut.class) == null) {
 				methods.add(method);
 			}
-		});
-		methods.sort(METHOD_COMPARATOR);
+		}, ReflectionUtils.USER_DECLARED_METHODS);
+		if (methods.size() > 1) {
+			methods.sort(METHOD_COMPARATOR);
+		}
 		return methods;
 	}
 

spring-aop/src/main/java/org/springframework/aop/aspectj/autoproxy/AspectJPrecedenceComparator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -138,14 +138,8 @@ class AspectJPrecedenceComparator implements Comparator<Advisor> {
 	}
 
 	private int getAspectDeclarationOrder(Advisor anAdvisor) {
-		AspectJPrecedenceInformation precedenceInfo =
-			AspectJAopUtils.getAspectJPrecedenceInformationFor(anAdvisor);
-		if (precedenceInfo != null) {
-			return precedenceInfo.getDeclarationOrder();
-		}
-		else {
-			return 0;
-		}
+		AspectJPrecedenceInformation precedenceInfo = AspectJAopUtils.getAspectJPrecedenceInformationFor(anAdvisor);
+		return (precedenceInfo != null ? precedenceInfo.getDeclarationOrder() : 0);
 	}
 
 }

spring-aop/src/main/java/org/springframework/aop/config/AopNamespaceHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -61,12 +61,12 @@ public class AopNamespaceHandler extends NamespaceHandlerSupport {
 	 */
 	@Override
 	public void init() {
-		// In 2.0 XSD as well as in 2.1 XSD.
+		// In 2.0 XSD as well as in 2.5+ XSDs
 		registerBeanDefinitionParser("config", new ConfigBeanDefinitionParser());
 		registerBeanDefinitionParser("aspectj-autoproxy", new AspectJAutoProxyBeanDefinitionParser());
 		registerBeanDefinitionDecorator("scoped-proxy", new ScopedProxyBeanDefinitionDecorator());
 
-		// Only in 2.0 XSD: moved to context namespace as of 2.1
+		// Only in 2.0 XSD: moved to context namespace in 2.5+
 		registerBeanDefinitionParser("spring-configured", new SpringConfiguredBeanDefinitionParser());
 	}
 

spring-aop/src/main/java/org/springframework/aop/framework/CglibAopProxy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -258,15 +258,17 @@ class CglibAopProxy implements AopProxy, Serializable {
 				int mod = method.getModifiers();
 				if (!Modifier.isStatic(mod) && !Modifier.isPrivate(mod)) {
 					if (Modifier.isFinal(mod)) {
-						if (implementsInterface(method, ifcs)) {
+						if (logger.isInfoEnabled() && implementsInterface(method, ifcs)) {
 							logger.info("Unable to proxy interface-implementing method [" + method + "] because " +
 									"it is marked as final: Consider using interface-based JDK proxies instead!");
 						}
-						logger.debug("Final method [" + method + "] cannot get proxied via CGLIB: " +
-								"Calls to this method will NOT be routed to the target instance and " +
-								"might lead to NPEs against uninitialized fields in the proxy instance.");
+						if (logger.isDebugEnabled()) {
+							logger.debug("Final method [" + method + "] cannot get proxied via CGLIB: " +
+									"Calls to this method will NOT be routed to the target instance and " +
+									"might lead to NPEs against uninitialized fields in the proxy instance.");
+						}
 					}
-					else if (!Modifier.isPublic(mod) && !Modifier.isProtected(mod) &&
+					else if (logger.isDebugEnabled() && !Modifier.isPublic(mod) && !Modifier.isProtected(mod) &&
 							proxyClassLoader != null && proxySuperClass.getClassLoader() != proxyClassLoader) {
 						logger.debug("Method [" + method + "] is package-visible across different ClassLoaders " +
 								"and cannot get proxied via CGLIB: Declare this method as public or protected " +
@@ -526,7 +528,7 @@ class CglibAopProxy implements AopProxy, Serializable {
 	private static class StaticDispatcher implements Dispatcher, Serializable {
 
 		@Nullable
-		private Object target;
+		private final Object target;
 
 		public StaticDispatcher(@Nullable Object target) {
 			this.target = target;
@@ -552,7 +554,7 @@ class CglibAopProxy implements AopProxy, Serializable {
 		}
 
 		@Override
-		public Object loadObject() throws Exception {
+		public Object loadObject() {
 			return this.advised;
 		}
 	}
@@ -940,11 +942,11 @@ class CglibAopProxy implements AopProxy, Serializable {
 			return true;
 		}
 
-		private boolean equalsAdviceClasses(Advisor a, Advisor b) {
+		private static boolean equalsAdviceClasses(Advisor a, Advisor b) {
 			return (a.getAdvice().getClass() == b.getAdvice().getClass());
 		}
 
-		private boolean equalsPointcuts(Advisor a, Advisor b) {
+		private static boolean equalsPointcuts(Advisor a, Advisor b) {
 			// If only one of the advisor (but not both) is PointcutAdvisor, then it is a mismatch.
 			// Takes care of the situations where an IntroductionAdvisor is used (see SPR-3959).
 			return (!(a instanceof PointcutAdvisor) ||

spring-aop/src/main/java/org/springframework/aop/framework/ProxyFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -21,9 +21,7 @@ import java.io.ObjectInputStream;
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 import org.aopalliance.aop.Advice;
 import org.aopalliance.intercept.Interceptor;
@@ -342,11 +340,8 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 		// an independent instance of the configuration.
 		// In this case, no proxy will have an instance of this object's configuration,
 		// but will have an independent copy.
-		if (logger.isTraceEnabled()) {
-			logger.trace("Creating copy of prototype ProxyFactoryBean config: " + this);
-		}
-
 		ProxyCreatorSupport copy = new ProxyCreatorSupport(getAopProxyFactory());
+
 		// The copy needs a fresh advisor chain, and a fresh TargetSource.
 		TargetSource targetSource = freshTargetSource();
 		copy.copyConfigurationFrom(this, targetSource, freshAdvisorChain());
@@ -359,9 +354,6 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 		}
 		copy.setFrozen(this.freezeProxy);
 
-		if (logger.isTraceEnabled()) {
-			logger.trace("Using ProxyCreatorSupport copy: " + copy);
-		}
 		return getProxy(copy.createAopProxy());
 	}
 
@@ -395,9 +387,7 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 						logger.debug("Bean with name '" + finalName + "' concluding interceptor chain " +
 								"is not an advisor class: treating it as a target or TargetSource");
 					}
-					String[] newNames = new String[this.interceptorNames.length - 1];
-					System.arraycopy(this.interceptorNames, 0, newNames, 0, newNames.length);
-					this.interceptorNames = newNames;
+					this.interceptorNames = Arrays.copyOf(this.interceptorNames, this.interceptorNames.length - 1);
 				}
 			}
 		}
@@ -449,16 +439,12 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 
 			// Materialize interceptor chain from bean names.
 			for (String name : this.interceptorNames) {
-				if (logger.isTraceEnabled()) {
-					logger.trace("Configuring advisor or advice '" + name + "'");
-				}
-
 				if (name.endsWith(GLOBAL_SUFFIX)) {
 					if (!(this.beanFactory instanceof ListableBeanFactory)) {
 						throw new AopConfigException(
 								"Can only use global advisors or interceptors with a ListableBeanFactory");
 					}
-					addGlobalAdvisor((ListableBeanFactory) this.beanFactory,
+					addGlobalAdvisors((ListableBeanFactory) this.beanFactory,
 							name.substring(0, name.length() - GLOBAL_SUFFIX.length()));
 				}
 
@@ -475,7 +461,7 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 						// Avoid unnecessary creation of prototype bean just for advisor chain initialization.
 						advice = new PrototypePlaceholderAdvisor(name);
 					}
-					addAdvisorOnChainCreation(advice, name);
+					addAdvisorOnChainCreation(advice);
 				}
 			}
 		}
@@ -498,11 +484,10 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 				if (logger.isDebugEnabled()) {
 					logger.debug("Refreshing bean named '" + pa.getBeanName() + "'");
 				}
-				// Replace the placeholder with a fresh prototype instance resulting
-				// from a getBean() lookup
+				// Replace the placeholder with a fresh prototype instance resulting from a getBean lookup
 				if (this.beanFactory == null) {
-					throw new IllegalStateException("No BeanFactory available anymore (probably due to serialization) " +
-							"- cannot resolve prototype advisor '" + pa.getBeanName() + "'");
+					throw new IllegalStateException("No BeanFactory available anymore (probably due to " +
+							"serialization) - cannot resolve prototype advisor '" + pa.getBeanName() + "'");
 				}
 				Object bean = this.beanFactory.getBean(pa.getBeanName());
 				Advisor refreshedAdvisor = namedBeanToAdvisor(bean);
@@ -519,28 +504,26 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 	/**
 	 * Add all global interceptors and pointcuts.
 	 */
-	private void addGlobalAdvisor(ListableBeanFactory beanFactory, String prefix) {
+	private void addGlobalAdvisors(ListableBeanFactory beanFactory, String prefix) {
 		String[] globalAdvisorNames =
 				BeanFactoryUtils.beanNamesForTypeIncludingAncestors(beanFactory, Advisor.class);
 		String[] globalInterceptorNames =
 				BeanFactoryUtils.beanNamesForTypeIncludingAncestors(beanFactory, Interceptor.class);
-		List<Object> beans = new ArrayList<>(globalAdvisorNames.length + globalInterceptorNames.length);
-		Map<Object, String> names = new HashMap<>(beans.size());
-		for (String name : globalAdvisorNames) {
-			Object bean = beanFactory.getBean(name);
-			beans.add(bean);
-			names.put(bean, name);
-		}
-		for (String name : globalInterceptorNames) {
-			Object bean = beanFactory.getBean(name);
-			beans.add(bean);
-			names.put(bean, name);
-		}
-		AnnotationAwareOrderComparator.sort(beans);
-		for (Object bean : beans) {
-			String name = names.get(bean);
-			if (name.startsWith(prefix)) {
-				addAdvisorOnChainCreation(bean, name);
+		if (globalAdvisorNames.length > 0 || globalInterceptorNames.length > 0) {
+			List<Object> beans = new ArrayList<>(globalAdvisorNames.length + globalInterceptorNames.length);
+			for (String name : globalAdvisorNames) {
+				if (name.startsWith(prefix)) {
+					beans.add(beanFactory.getBean(name));
+				}
+			}
+			for (String name : globalInterceptorNames) {
+				if (name.startsWith(prefix)) {
+					beans.add(beanFactory.getBean(name));
+				}
+			}
+			AnnotationAwareOrderComparator.sort(beans);
+			for (Object bean : beans) {
+				addAdvisorOnChainCreation(bean);
 			}
 		}
 	}
@@ -551,17 +534,11 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 	 * Because of these three possibilities, we can't type the signature
 	 * more strongly.
 	 * @param next advice, advisor or target object
-	 * @param name bean name from which we obtained this object in our owning
-	 * bean factory
 	 */
-	private void addAdvisorOnChainCreation(Object next, String name) {
+	private void addAdvisorOnChainCreation(Object next) {
 		// We need to convert to an Advisor if necessary so that our source reference
 		// matches what we find from superclass interceptors.
-		Advisor advisor = namedBeanToAdvisor(next);
-		if (logger.isTraceEnabled()) {
-			logger.trace("Adding advisor with name '" + name + "'");
-		}
-		addAdvisor(advisor);
+		addAdvisor(namedBeanToAdvisor(next));
 	}
 
 	/**
@@ -572,9 +549,7 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 	 */
 	private TargetSource freshTargetSource() {
 		if (this.targetName == null) {
-			if (logger.isTraceEnabled()) {
-				logger.trace("Not refreshing target: Bean name not specified in 'interceptorNames'.");
-			}
+			// Not refreshing target: bean name not specified in 'interceptorNames'
 			return this.targetSource;
 		}
 		else {
@@ -602,8 +577,8 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 			// We expected this to be an Advisor or Advice,
 			// but it wasn't. This is a configuration error.
 			throw new AopConfigException("Unknown advisor type " + next.getClass() +
-					"; Can only include Advisor or Advice type beans in interceptorNames chain except for last entry," +
-					"which may also be target or TargetSource", ex);
+					"; can only include Advisor or Advice type beans in interceptorNames chain " +
+					"except for last entry which may also be target instance or TargetSource", ex);
 		}
 	}
 
@@ -614,7 +589,7 @@ public class ProxyFactoryBean extends ProxyCreatorSupport
 	protected void adviceChanged() {
 		super.adviceChanged();
 		if (this.singleton) {
-			logger.debug("Advice has changed; recaching singleton instance");
+			logger.debug("Advice has changed; re-caching singleton instance");
 			synchronized (this) {
 				this.singletonInstance = null;
 			}

spring-aspects/src/main/java/org/springframework/beans/factory/aspectj/AbstractInterfaceDrivenDependencyInjectionAspect.aj

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -67,6 +67,7 @@ import java.io.Serializable;
  * @since 2.5.2
  */
 public abstract aspect AbstractInterfaceDrivenDependencyInjectionAspect extends AbstractDependencyInjectionAspect {
+
 	/**
 	 * Select initialization join point as object construction
 	 */

spring-aspects/src/main/java/org/springframework/beans/factory/aspectj/AnnotationBeanConfigurerAspect.aj

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -47,22 +47,26 @@ import org.springframework.beans.factory.wiring.BeanConfigurerSupport;
 public aspect AnnotationBeanConfigurerAspect extends AbstractInterfaceDrivenDependencyInjectionAspect
 		implements BeanFactoryAware, InitializingBean, DisposableBean {
 
-	private BeanConfigurerSupport beanConfigurerSupport = new BeanConfigurerSupport();
+	private final BeanConfigurerSupport beanConfigurerSupport = new BeanConfigurerSupport();
 
 
+	@Override
 	public void setBeanFactory(BeanFactory beanFactory) {
 		this.beanConfigurerSupport.setBeanWiringInfoResolver(new AnnotationBeanWiringInfoResolver());
 		this.beanConfigurerSupport.setBeanFactory(beanFactory);
 	}
 
+	@Override
 	public void afterPropertiesSet() {
 		this.beanConfigurerSupport.afterPropertiesSet();
 	}
 
+	@Override
 	public void configureBean(Object bean) {
 		this.beanConfigurerSupport.configureBean(bean);
 	}
 
+	@Override
 	public void destroy() {
 		this.beanConfigurerSupport.destroy();
 	}

spring-aspects/src/main/java/org/springframework/scheduling/aspectj/AspectJAsyncConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -37,6 +37,7 @@ import org.springframework.scheduling.config.TaskManagementConfigUtils;
  * @see org.springframework.scheduling.annotation.ProxyAsyncConfiguration
  */
 @Configuration
+@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
 public class AspectJAsyncConfiguration extends AbstractAsyncConfiguration {
 
 	@Bean(name = TaskManagementConfigUtils.ASYNC_EXECUTION_ASPECT_BEAN_NAME)

spring-aspects/src/main/java/org/springframework/transaction/aspectj/AspectJJtaTransactionManagementConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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 +36,7 @@ import org.springframework.transaction.config.TransactionManagementConfigUtils;
  * @see TransactionManagementConfigurationSelector
  */
 @Configuration
+@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
 public class AspectJJtaTransactionManagementConfiguration extends AspectJTransactionManagementConfiguration {
 
 	@Bean(name = TransactionManagementConfigUtils.JTA_TRANSACTION_ASPECT_BEAN_NAME)

spring-aspects/src/main/java/org/springframework/transaction/aspectj/AspectJTransactionManagementConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -38,6 +38,7 @@ import org.springframework.transaction.config.TransactionManagementConfigUtils;
  * @see AspectJJtaTransactionManagementConfiguration
  */
 @Configuration
+@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
 public class AspectJTransactionManagementConfiguration extends AbstractTransactionManagementConfiguration {
 
 	@Bean(name = TransactionManagementConfigUtils.TRANSACTION_ASPECT_BEAN_NAME)

spring-beans/src/main/java/org/springframework/beans/BeanWrapperImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -97,7 +97,7 @@ public class BeanWrapperImpl extends AbstractNestablePropertyAccessor implements
 
 	/**
 	 * Create a new BeanWrapperImpl for the given object.
-	 * @param object object wrapped by this BeanWrapper
+	 * @param object the object wrapped by this BeanWrapper
 	 */
 	public BeanWrapperImpl(Object object) {
 		super(object);
@@ -114,7 +114,7 @@ public class BeanWrapperImpl extends AbstractNestablePropertyAccessor implements
 	/**
 	 * Create a new BeanWrapperImpl for the given object,
 	 * registering a nested path that the object is in.
-	 * @param object object wrapped by this BeanWrapper
+	 * @param object the object wrapped by this BeanWrapper
 	 * @param nestedPath the nested path of the object
 	 * @param rootObject the root object at the top of the path
 	 */
@@ -125,7 +125,7 @@ public class BeanWrapperImpl extends AbstractNestablePropertyAccessor implements
 	/**
 	 * Create a new BeanWrapperImpl for the given object,
 	 * registering a nested path that the object is in.
-	 * @param object object wrapped by this BeanWrapper
+	 * @param object the object wrapped by this BeanWrapper
 	 * @param nestedPath the nested path of the object
 	 * @param parent the containing BeanWrapper (must not be {@code null})
 	 */
@@ -289,15 +289,15 @@ public class BeanWrapperImpl extends AbstractNestablePropertyAccessor implements
 		@Override
 		@Nullable
 		public Object getValue() throws Exception {
-			final Method readMethod = this.pd.getReadMethod();
+			Method readMethod = this.pd.getReadMethod();
 			if (System.getSecurityManager() != null) {
 				AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
 					ReflectionUtils.makeAccessible(readMethod);
 					return null;
 				});
 				try {
-					return AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () ->
-							readMethod.invoke(getWrappedInstance(), (Object[]) null), acc);
+					return AccessController.doPrivileged((PrivilegedExceptionAction<Object>)
+							() -> readMethod.invoke(getWrappedInstance(), (Object[]) null), acc);
 				}
 				catch (PrivilegedActionException pae) {
 					throw pae.getException();
@@ -310,8 +310,8 @@ public class BeanWrapperImpl extends AbstractNestablePropertyAccessor implements
 		}
 
 		@Override
-		public void setValue(final @Nullable Object value) throws Exception {
-			final Method writeMethod = (this.pd instanceof GenericTypeAwarePropertyDescriptor ?
+		public void setValue(@Nullable Object value) throws Exception {
+			Method writeMethod = (this.pd instanceof GenericTypeAwarePropertyDescriptor ?
 					((GenericTypeAwarePropertyDescriptor) this.pd).getWriteMethodForActualAccess() :
 					this.pd.getWriteMethod());
 			if (System.getSecurityManager() != null) {
@@ -320,8 +320,8 @@ public class BeanWrapperImpl extends AbstractNestablePropertyAccessor implements
 					return null;
 				});
 				try {
-					AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () ->
-							writeMethod.invoke(getWrappedInstance(), value), acc);
+					AccessController.doPrivileged((PrivilegedExceptionAction<Object>)
+							() -> writeMethod.invoke(getWrappedInstance(), value), acc);
 				}
 				catch (PrivilegedActionException ex) {
 					throw ex.getException();

spring-beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -97,7 +97,7 @@ public final class CachedIntrospectionResults {
 			SpringProperties.getFlag(IGNORE_BEANINFO_PROPERTY_NAME);
 
 	/** Stores the BeanInfoFactory instances. */
-	private static List<BeanInfoFactory> beanInfoFactories = SpringFactoriesLoader.loadFactories(
+	private static final List<BeanInfoFactory> beanInfoFactories = SpringFactoriesLoader.loadFactories(
 			BeanInfoFactory.class, CachedIntrospectionResults.class.getClassLoader());
 
 	private static final Log logger = LogFactory.getLog(CachedIntrospectionResults.class);

spring-beans/src/main/java/org/springframework/beans/factory/FactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -39,10 +39,16 @@ import org.springframework.lang.Nullable;
  *
  * <p><b>{@code FactoryBean} is a programmatic contract. Implementations are not
  * supposed to rely on annotation-driven injection or other reflective facilities.</b>
- * {@link #getObjectType()} {@link #getObject()} invocations may arrive early in
- * the bootstrap process, even ahead of any post-processor setup. If you need access
+ * {@link #getObjectType()} {@link #getObject()} invocations may arrive early in the
+ * bootstrap process, even ahead of any post-processor setup. If you need access to
  * other beans, implement {@link BeanFactoryAware} and obtain them programmatically.
  *
+ * <p><b>The container is only responsible for managing the lifecycle of the FactoryBean
+ * instance, not the lifecycle of the objects created by the FactoryBean.</b> Therefore,
+ * a destroy method on an exposed bean object (such as {@link java.io.Closeable#close()}
+ * will <i>not</i> be called automatically. Instead, a FactoryBean should implement
+ * {@link DisposableBean} and delegate any such close call to the underlying object.
+ *
  * <p>Finally, FactoryBean objects participate in the containing BeanFactory's
  * synchronization of bean creation. There is usually no need for internal
  * synchronization other than for purposes of lazy initialization within the

spring-beans/src/main/java/org/springframework/beans/factory/annotation/Lookup.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -41,12 +41,11 @@ import java.lang.annotation.Target;
  * regular constructors: i.e. lookup methods cannot get replaced on beans returned
  * from factory methods where we cannot dynamically provide a subclass for them.
  *
- * <p><b>Concrete limitations in typical Spring configuration scenarios:</b>
- * When used with component scanning or any other mechanism that filters out abstract
- * beans, provide stub implementations of your lookup methods to be able to declare
- * them as concrete classes. And please remember that lookup methods won't work on
- * beans returned from {@code @Bean} methods in configuration classes; you'll have
- * to resort to {@code @Inject Provider<TargetBean>} or the like instead.
+ * <p><b>Recommendations for typical Spring configuration scenarios:</b>
+ * When a concrete class may be needed in certain scenarios, consider providing stub
+ * implementations of your lookup methods. And please remember that lookup methods
+ * won't work on beans returned from {@code @Bean} methods in configuration classes;
+ * you'll have to resort to {@code @Inject Provider<TargetBean>} or the like instead.
  *
  * @author Juergen Hoeller
  * @since 4.1

spring-beans/src/main/java/org/springframework/beans/factory/config/DependencyDescriptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -373,7 +373,7 @@ public class DependencyDescriptor extends InjectionPoint implements Serializable
 
 	/**
 	 * Determine the name of the wrapped parameter/field.
-	 * @return the declared name (never {@code null})
+	 * @return the declared name (may be {@code null} if unresolvable)
 	 */
 	@Nullable
 	public String getDependencyName() {

spring-beans/src/main/java/org/springframework/beans/factory/config/YamlProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -25,17 +25,23 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
+import java.util.Set;
+import java.util.stream.Collectors;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.yaml.snakeyaml.DumperOptions;
 import org.yaml.snakeyaml.LoaderOptions;
 import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.Constructor;
 import org.yaml.snakeyaml.reader.UnicodeReader;
+import org.yaml.snakeyaml.representer.Representer;
 
 import org.springframework.core.CollectionFactory;
 import org.springframework.core.io.Resource;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -45,6 +51,7 @@ import org.springframework.util.StringUtils;
  *
  * @author Dave Syer
  * @author Juergen Hoeller
+ * @author Sam Brannen
  * @since 4.1
  */
 public abstract class YamlProcessor {
@@ -59,6 +66,8 @@ public abstract class YamlProcessor {
 
 	private boolean matchDefault = true;
 
+	private Set<String> supportedTypes = Collections.emptySet();
+
 
 	/**
 	 * A map of document matchers allowing callers to selectively use only
@@ -117,6 +126,27 @@ public abstract class YamlProcessor {
 		this.resources = resources;
 	}
 
+	/**
+	 * Set the supported types that can be loaded from YAML documents.
+	 * <p>If no supported types are configured, all types encountered in YAML
+	 * documents will be supported. If an unsupported type is encountered, an
+	 * {@link IllegalStateException} will be thrown when the corresponding YAML
+	 * node is processed.
+	 * @param supportedTypes the supported types, or an empty array to clear the
+	 * supported types
+	 * @since 5.1.16
+	 * @see #createYaml()
+	 */
+	public void setSupportedTypes(Class<?>... supportedTypes) {
+		if (ObjectUtils.isEmpty(supportedTypes)) {
+			this.supportedTypes = Collections.emptySet();
+		}
+		else {
+			Assert.noNullElements(supportedTypes, "'supportedTypes' must not contain null elements");
+			this.supportedTypes = Arrays.stream(supportedTypes).map(Class::getName)
+					.collect(Collectors.collectingAndThen(Collectors.toSet(), Collections::unmodifiableSet));
+		}
+	}
 
 	/**
 	 * Provide an opportunity for subclasses to process the Yaml parsed from the supplied
@@ -142,12 +172,22 @@ public abstract class YamlProcessor {
 	 * Create the {@link Yaml} instance to use.
 	 * <p>The default implementation sets the "allowDuplicateKeys" flag to {@code false},
 	 * enabling built-in duplicate key handling in SnakeYAML 1.18+.
+	 * <p>As of Spring Framework 5.1.16, if custom {@linkplain #setSupportedTypes
+	 * supported types} have been configured, the default implementation creates
+	 * a {@code Yaml} instance that filters out unsupported types encountered in
+	 * YAML documents. If an unsupported type is encountered, an
+	 * {@link IllegalStateException} will be thrown when the node is processed.
 	 * @see LoaderOptions#setAllowDuplicateKeys(boolean)
 	 */
 	protected Yaml createYaml() {
-		LoaderOptions options = new LoaderOptions();
-		options.setAllowDuplicateKeys(false);
-		return new Yaml(options);
+		LoaderOptions loaderOptions = new LoaderOptions();
+		loaderOptions.setAllowDuplicateKeys(false);
+
+		if (!this.supportedTypes.isEmpty()) {
+			return new Yaml(new FilteringConstructor(), new Representer(),
+					new DumperOptions(), loaderOptions);
+		}
+		return new Yaml(loaderOptions);
 	}
 
 	private boolean process(MatchCallback callback, Yaml yaml, Resource resource) {
@@ -388,4 +428,20 @@ public abstract class YamlProcessor {
 		FIRST_FOUND
 	}
 
+
+	/**
+	 * {@link Constructor} that supports filtering of unsupported types.
+	 * <p>If an unsupported type is encountered in a YAML document, an
+	 * {@link IllegalStateException} will be thrown from {@link #getClassForName}.
+	 */
+	private class FilteringConstructor extends Constructor {
+
+		@Override
+		protected Class<?> getClassForName(String name) throws ClassNotFoundException {
+			Assert.state(YamlProcessor.this.supportedTypes.contains(name),
+					() -> "Unsupported type encountered in YAML document: " + name);
+			return super.getClassForName(name);
+		}
+	}
+
 }

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractAutowireCapableBeanFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -309,7 +309,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	public void autowireBean(Object existingBean) {
 		// Use non-singleton bean definition, to avoid registering bean as dependent bean.
 		RootBeanDefinition bd = new RootBeanDefinition(ClassUtils.getUserClass(existingBean));
-		bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);
+		bd.setScope(SCOPE_PROTOTYPE);
 		bd.allowCaching = ClassUtils.isCacheSafe(bd.getBeanClass(), getBeanClassLoader());
 		BeanWrapper bw = new BeanWrapperImpl(existingBean);
 		initBeanWrapper(bw);
@@ -329,7 +329,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 			bd = new RootBeanDefinition(mbd);
 		}
 		if (!bd.isPrototype()) {
-			bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);
+			bd.setScope(SCOPE_PROTOTYPE);
 			bd.allowCaching = ClassUtils.isCacheSafe(ClassUtils.getUserClass(existingBean), getBeanClassLoader());
 		}
 		BeanWrapper bw = new BeanWrapperImpl(existingBean);
@@ -347,28 +347,27 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	public Object createBean(Class<?> beanClass, int autowireMode, boolean dependencyCheck) throws BeansException {
 		// Use non-singleton bean definition, to avoid registering bean as dependent bean.
 		RootBeanDefinition bd = new RootBeanDefinition(beanClass, autowireMode, dependencyCheck);
-		bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);
+		bd.setScope(SCOPE_PROTOTYPE);
 		return createBean(beanClass.getName(), bd, null);
 	}
 
 	@Override
 	public Object autowire(Class<?> beanClass, int autowireMode, boolean dependencyCheck) throws BeansException {
 		// Use non-singleton bean definition, to avoid registering bean as dependent bean.
-		final RootBeanDefinition bd = new RootBeanDefinition(beanClass, autowireMode, dependencyCheck);
-		bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);
+		RootBeanDefinition bd = new RootBeanDefinition(beanClass, autowireMode, dependencyCheck);
+		bd.setScope(SCOPE_PROTOTYPE);
 		if (bd.getResolvedAutowireMode() == AUTOWIRE_CONSTRUCTOR) {
 			return autowireConstructor(beanClass.getName(), bd, null, null).getWrappedInstance();
 		}
 		else {
 			Object bean;
-			final BeanFactory parent = this;
 			if (System.getSecurityManager() != null) {
-				bean = AccessController.doPrivileged((PrivilegedAction<Object>) () ->
-						getInstantiationStrategy().instantiate(bd, null, parent),
+				bean = AccessController.doPrivileged(
+						(PrivilegedAction<Object>) () -> getInstantiationStrategy().instantiate(bd, null, this),
 						getAccessControlContext());
 			}
 			else {
-				bean = getInstantiationStrategy().instantiate(bd, null, parent);
+				bean = getInstantiationStrategy().instantiate(bd, null, this);
 			}
 			populateBean(beanClass.getName(), bd, new BeanWrapperImpl(bean));
 			return bean;
@@ -385,7 +384,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 		// Use non-singleton bean definition, to avoid registering bean as dependent bean.
 		RootBeanDefinition bd =
 				new RootBeanDefinition(ClassUtils.getUserClass(existingBean), autowireMode, dependencyCheck);
-		bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);
+		bd.setScope(SCOPE_PROTOTYPE);
 		BeanWrapper bw = new BeanWrapperImpl(existingBean);
 		initBeanWrapper(bw);
 		populateBean(bd.getBeanClass().getName(), bd, bw);
@@ -543,7 +542,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	 * @see #instantiateUsingFactoryMethod
 	 * @see #autowireConstructor
 	 */
-	protected Object doCreateBean(final String beanName, final RootBeanDefinition mbd, final @Nullable Object[] args)
+	protected Object doCreateBean(String beanName, RootBeanDefinition mbd, @Nullable Object[] args)
 			throws BeanCreationException {
 
 		// Instantiate the bean.
@@ -554,7 +553,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 		if (instanceWrapper == null) {
 			instanceWrapper = createBeanInstance(beanName, mbd, args);
 		}
-		final Object bean = instanceWrapper.getWrappedInstance();
+		Object bean = instanceWrapper.getWrappedInstance();
 		Class<?> beanType = instanceWrapper.getWrappedClass();
 		if (beanType != NullBean.class) {
 			mbd.resolvedTargetType = beanType;
@@ -623,7 +622,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 								"] in its raw version as part of a circular reference, but has eventually been " +
 								"wrapped. This means that said other beans do not use the final version of the " +
 								"bean. This is often the result of over-eager type matching - consider using " +
-								"'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.");
+								"'getBeanNamesForType' with the 'allowEagerInit' flag turned off, for example.");
 					}
 				}
 			}
@@ -899,7 +898,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	 * @return the common {@code FactoryBean} object type, or {@code null} if none
 	 */
 	@Nullable
-	private Class<?> getTypeForFactoryBeanFromMethod(Class<?> beanClass, final String factoryMethodName) {
+	private Class<?> getTypeForFactoryBeanFromMethod(Class<?> beanClass, String factoryMethodName) {
 
 		/**
 		 * Holder used to keep a reference to a {@code Class} value.
@@ -1281,17 +1280,16 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	 * @param mbd the bean definition for the bean
 	 * @return a BeanWrapper for the new instance
 	 */
-	protected BeanWrapper instantiateBean(final String beanName, final RootBeanDefinition mbd) {
+	protected BeanWrapper instantiateBean(String beanName, RootBeanDefinition mbd) {
 		try {
 			Object beanInstance;
-			final BeanFactory parent = this;
 			if (System.getSecurityManager() != null) {
-				beanInstance = AccessController.doPrivileged((PrivilegedAction<Object>) () ->
-						getInstantiationStrategy().instantiate(mbd, beanName, parent),
+				beanInstance = AccessController.doPrivileged(
+						(PrivilegedAction<Object>) () -> getInstantiationStrategy().instantiate(mbd, beanName, this),
 						getAccessControlContext());
 			}
 			else {
-				beanInstance = getInstantiationStrategy().instantiate(mbd, beanName, parent);
+				beanInstance = getInstantiationStrategy().instantiate(mbd, beanName, this);
 			}
 			BeanWrapper bw = new BeanWrapperImpl(beanInstance);
 			initBeanWrapper(bw);
@@ -1747,7 +1745,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	 * @see #invokeInitMethods
 	 * @see #applyBeanPostProcessorsAfterInitialization
 	 */
-	protected Object initializeBean(final String beanName, final Object bean, @Nullable RootBeanDefinition mbd) {
+	protected Object initializeBean(String beanName, Object bean, @Nullable RootBeanDefinition mbd) {
 		if (System.getSecurityManager() != null) {
 			AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
 				invokeAwareMethods(beanName, bean);
@@ -1778,7 +1776,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 		return wrappedBean;
 	}
 
-	private void invokeAwareMethods(final String beanName, final Object bean) {
+	private void invokeAwareMethods(String beanName, Object bean) {
 		if (bean instanceof Aware) {
 			if (bean instanceof BeanNameAware) {
 				((BeanNameAware) bean).setBeanName(beanName);
@@ -1807,7 +1805,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	 * @throws Throwable if thrown by init methods or by the invocation process
 	 * @see #invokeCustomInitMethod
 	 */
-	protected void invokeInitMethods(String beanName, final Object bean, @Nullable RootBeanDefinition mbd)
+	protected void invokeInitMethods(String beanName, Object bean, @Nullable RootBeanDefinition mbd)
 			throws Throwable {
 
 		boolean isInitializingBean = (bean instanceof InitializingBean);
@@ -1848,7 +1846,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	 * methods with arguments.
 	 * @see #invokeInitMethods
 	 */
-	protected void invokeCustomInitMethod(String beanName, final Object bean, RootBeanDefinition mbd)
+	protected void invokeCustomInitMethod(String beanName, Object bean, RootBeanDefinition mbd)
 			throws Throwable {
 
 		String initMethodName = mbd.getInitMethodName();
@@ -1883,8 +1881,8 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 				return null;
 			});
 			try {
-				AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () ->
-						methodToInvoke.invoke(bean), getAccessControlContext());
+				AccessController.doPrivileged((PrivilegedExceptionAction<Object>)
+						() -> methodToInvoke.invoke(bean), getAccessControlContext());
 			}
 			catch (PrivilegedActionException pae) {
 				InvocationTargetException ex = (InvocationTargetException) pae.getException();

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanDefinition.java

@@ -898,16 +898,20 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 	}
 
 	/**
-	 * Specify whether or not the configured init method is the default.
-	 * <p>The default value is {@code false}.
+	 * Specify whether or not the configured initializer method is the default.
+	 * <p>The default value is {@code true} for a locally specified init method
+	 * but switched to {@code false} for a shared setting in a defaults section
+	 * (e.g. {@code bean init-method} versus {@code beans default-init-method}
+	 * level in XML) which might not apply to all contained bean definitions.
 	 * @see #setInitMethodName
+	 * @see #applyDefaults
 	 */
 	public void setEnforceInitMethod(boolean enforceInitMethod) {
 		this.enforceInitMethod = enforceInitMethod;
 	}
 
 	/**
-	 * Indicate whether the configured init method is the default.
+	 * Indicate whether the configured initializer method is the default.
 	 * @see #getInitMethodName()
 	 */
 	public boolean isEnforceInitMethod() {
@@ -934,8 +938,12 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 
 	/**
 	 * Specify whether or not the configured destroy method is the default.
-	 * <p>The default value is {@code false}.
+	 * <p>The default value is {@code true} for a locally specified destroy method
+	 * but switched to {@code false} for a shared setting in a defaults section
+	 * (e.g. {@code bean destroy-method} versus {@code beans default-destroy-method}
+	 * level in XML) which might not apply to all contained bean definitions.
 	 * @see #setDestroyMethodName
+	 * @see #applyDefaults
 	 */
 	public void setEnforceDestroyMethod(boolean enforceDestroyMethod) {
 		this.enforceDestroyMethod = enforceDestroyMethod;
@@ -943,7 +951,7 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 
 	/**
 	 * Indicate whether the configured destroy method is the default.
-	 * @see #getDestroyMethodName
+	 * @see #getDestroyMethodName()
 	 */
 	public boolean isEnforceDestroyMethod() {
 		return this.enforceDestroyMethod;

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -147,7 +147,7 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 	/** String resolvers to apply e.g. to annotation attribute values. */
 	private final List<StringValueResolver> embeddedValueResolvers = new CopyOnWriteArrayList<>();
 
-	/** BeanPostProcessors to apply in createBean. */
+	/** BeanPostProcessors to apply. */
 	private final List<BeanPostProcessor> beanPostProcessors = new CopyOnWriteArrayList<>();
 
 	/** Indicates whether any InstantiationAwareBeanPostProcessors have been registered. */
@@ -236,10 +236,11 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 	 * @throws BeansException if the bean could not be created
 	 */
 	@SuppressWarnings("unchecked")
-	protected <T> T doGetBean(final String name, @Nullable final Class<T> requiredType,
-			@Nullable final Object[] args, boolean typeCheckOnly) throws BeansException {
+	protected <T> T doGetBean(
+			String name, @Nullable Class<T> requiredType, @Nullable Object[] args, boolean typeCheckOnly)
+			throws BeansException {
 
-		final String beanName = transformedBeanName(name);
+		String beanName = transformedBeanName(name);
 		Object bean;
 
 		// Eagerly check singleton cache for manually registered singletons.
@@ -291,7 +292,7 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 			}
 
 			try {
-				final RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
+				RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
 				checkMergedBeanDefinition(mbd, beanName, args);
 
 				// Guarantee initialization of beans that the current bean depends on.
@@ -345,7 +346,10 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 
 				else {
 					String scopeName = mbd.getScope();
-					final Scope scope = this.scopes.get(scopeName);
+					if (!StringUtils.hasLength(scopeName)) {
+						throw new IllegalStateException("No scope name defined for bean ´" + beanName + "'");
+					}
+					Scope scope = this.scopes.get(scopeName);
 					if (scope == null) {
 						throw new IllegalStateException("No Scope registered for scope name '" + scopeName + "'");
 					}
@@ -469,10 +473,12 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 			return false;
 		}
 		if (isFactoryBean(beanName, mbd)) {
-			final FactoryBean<?> fb = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
+			FactoryBean<?> fb = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
 			if (System.getSecurityManager() != null) {
-				return AccessController.doPrivileged((PrivilegedAction<Boolean>) () ->
-						((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) || !fb.isSingleton()),
+				return AccessController.doPrivileged(
+						(PrivilegedAction<Boolean>) () ->
+								((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) ||
+										!fb.isSingleton()),
 						getAccessControlContext());
 			}
 			else {
@@ -887,7 +893,7 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 
 	/**
 	 * Return whether this factory holds a InstantiationAwareBeanPostProcessor
-	 * that will get applied to singleton beans on shutdown.
+	 * that will get applied to singleton beans on creation.
 	 * @see #addBeanPostProcessor
 	 * @see org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor
 	 */
@@ -1283,7 +1289,7 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 							else {
 								throw new NoSuchBeanDefinitionException(parentBeanName,
 										"Parent name '" + parentBeanName + "' is equal to bean name '" + beanName +
-										"': cannot be resolved without an AbstractBeanFactory parent");
+										"': cannot be resolved without a ConfigurableBeanFactory parent");
 							}
 						}
 					}
@@ -1298,7 +1304,7 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 
 				// Set default singleton scope, if not configured before.
 				if (!StringUtils.hasLength(mbd.getScope())) {
-					mbd.setScope(RootBeanDefinition.SCOPE_SINGLETON);
+					mbd.setScope(SCOPE_SINGLETON);
 				}
 
 				// A bean contained in a non-singleton bean cannot be a singleton itself.
@@ -1369,7 +1375,7 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 	 * @throws CannotLoadBeanClassException if we failed to load the class
 	 */
 	@Nullable
-	protected Class<?> resolveBeanClass(final RootBeanDefinition mbd, String beanName, final Class<?>... typesToMatch)
+	protected Class<?> resolveBeanClass(RootBeanDefinition mbd, String beanName, Class<?>... typesToMatch)
 			throws CannotLoadBeanClassException {
 
 		try {
@@ -1377,8 +1383,8 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 				return mbd.getBeanClass();
 			}
 			if (System.getSecurityManager() != null) {
-				return AccessController.doPrivileged((PrivilegedExceptionAction<Class<?>>) () ->
-					doResolveBeanClass(mbd, typesToMatch), getAccessControlContext());
+				return AccessController.doPrivileged((PrivilegedExceptionAction<Class<?>>)
+						() -> doResolveBeanClass(mbd, typesToMatch), getAccessControlContext());
 			}
 			else {
 				return doResolveBeanClass(mbd, typesToMatch);
@@ -1634,7 +1640,7 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 	 * Get the object for the given bean instance, either the bean
 	 * instance itself or its created object in case of a FactoryBean.
 	 * @param beanInstance the shared bean instance
-	 * @param name name that may include factory dereference prefix
+	 * @param name the name that may include factory dereference prefix
 	 * @param beanName the canonical bean name
 	 * @param mbd the merged bean definition
 	 * @return the object to expose for the bean

spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionDefaults.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -25,6 +25,7 @@ import org.springframework.util.StringUtils;
  * @author Mark Fisher
  * @author Juergen Hoeller
  * @since 2.5
+ * @see AbstractBeanDefinition#applyDefaults
  */
 public class BeanDefinitionDefaults {
 
@@ -45,6 +46,7 @@ public class BeanDefinitionDefaults {
 	 * Set whether beans should be lazily initialized by default.
 	 * <p>If {@code false}, the bean will get instantiated on startup by bean
 	 * factories that perform eager initialization of singletons.
+	 * @see AbstractBeanDefinition#setLazyInit
 	 */
 	public void setLazyInit(boolean lazyInit) {
 		this.lazyInit = lazyInit;
@@ -66,6 +68,7 @@ public class BeanDefinitionDefaults {
 	 * (however, there may still be explicit annotation-driven autowiring).
 	 * @param autowireMode the autowire mode to set.
 	 * Must be one of the constants defined in {@link AbstractBeanDefinition}.
+	 * @see AbstractBeanDefinition#setAutowireMode
 	 */
 	public void setAutowireMode(int autowireMode) {
 		this.autowireMode = autowireMode;
@@ -82,6 +85,7 @@ public class BeanDefinitionDefaults {
 	 * Set the dependency check code.
 	 * @param dependencyCheck the code to set.
 	 * Must be one of the constants defined in {@link AbstractBeanDefinition}.
+	 * @see AbstractBeanDefinition#setDependencyCheck
 	 */
 	public void setDependencyCheck(int dependencyCheck) {
 		this.dependencyCheck = dependencyCheck;
@@ -96,6 +100,10 @@ public class BeanDefinitionDefaults {
 
 	/**
 	 * Set the name of the default initializer method.
+	 * <p>Note that this method is not enforced on all affected bean definitions
+	 * but rather taken as an optional callback, to be invoked if actually present.
+	 * @see AbstractBeanDefinition#setInitMethodName
+	 * @see AbstractBeanDefinition#setEnforceInitMethod
 	 */
 	public void setInitMethodName(@Nullable String initMethodName) {
 		this.initMethodName = (StringUtils.hasText(initMethodName) ? initMethodName : null);
@@ -111,6 +119,10 @@ public class BeanDefinitionDefaults {
 
 	/**
 	 * Set the name of the default destroy method.
+	 * <p>Note that this method is not enforced on all affected bean definitions
+	 * but rather taken as an optional callback, to be invoked if actually present.
+	 * @see AbstractBeanDefinition#setDestroyMethodName
+	 * @see AbstractBeanDefinition#setEnforceDestroyMethod
 	 */
 	public void setDestroyMethodName(@Nullable String destroyMethodName) {
 		this.destroyMethodName = (StringUtils.hasText(destroyMethodName) ? destroyMethodName : null);

spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultListableBeanFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -162,6 +162,9 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	/** Map of bean definition objects, keyed by bean name. */
 	private final Map<String, BeanDefinition> beanDefinitionMap = new ConcurrentHashMap<>(256);
 
+	/** Map from bean name to merged BeanDefinitionHolder. */
+	private final Map<String, BeanDefinitionHolder> mergedBeanDefinitionHolders = new ConcurrentHashMap<>(256);
+
 	/** Map of singleton and non-singleton bean names, keyed by dependency type. */
 	private final Map<Class<?>, String[]> allBeanNamesByType = new ConcurrentHashMap<>(64);
 
@@ -289,12 +292,12 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	 * when deciding whether a bean definition should be considered as a
 	 * candidate for autowiring.
 	 */
-	public void setAutowireCandidateResolver(final AutowireCandidateResolver autowireCandidateResolver) {
+	public void setAutowireCandidateResolver(AutowireCandidateResolver autowireCandidateResolver) {
 		Assert.notNull(autowireCandidateResolver, "AutowireCandidateResolver must not be null");
 		if (autowireCandidateResolver instanceof BeanFactoryAware) {
 			if (System.getSecurityManager() != null) {
 				AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
-					((BeanFactoryAware) autowireCandidateResolver).setBeanFactory(DefaultListableBeanFactory.this);
+					((BeanFactoryAware) autowireCandidateResolver).setBeanFactory(this);
 					return null;
 				}, getAccessControlContext());
 			}
@@ -500,8 +503,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 
 		// Check all bean definitions.
 		for (String beanName : this.beanDefinitionNames) {
-			// Only consider bean as eligible if the bean name
-			// is not defined as alias for some other bean.
+			// Only consider bean as eligible if the bean name is not defined as alias for some other bean.
 			if (!isAlias(beanName)) {
 				try {
 					RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
@@ -548,6 +550,9 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 					}
 					onSuppressedException(ex);
 				}
+				catch (NoSuchBeanDefinitionException ex) {
+					// Bean definition got removed while we were iterating -> ignore.
+				}
 			}
 		}
 
@@ -598,8 +603,8 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 
 	@Override
 	@SuppressWarnings("unchecked")
-	public <T> Map<String, T> getBeansOfType(@Nullable Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
-			throws BeansException {
+	public <T> Map<String, T> getBeansOfType(
+			@Nullable Class<T> type, boolean includeNonSingletons, boolean allowEagerInit) throws BeansException {
 
 		String[] beanNames = getBeanNamesForType(type, includeNonSingletons, allowEagerInit);
 		Map<String, T> result = new LinkedHashMap<>(beanNames.length);
@@ -636,8 +641,8 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	public String[] getBeanNamesForAnnotation(Class<? extends Annotation> annotationType) {
 		List<String> result = new ArrayList<>();
 		for (String beanName : this.beanDefinitionNames) {
-			BeanDefinition beanDefinition = getBeanDefinition(beanName);
-			if (!beanDefinition.isAbstract() && findAnnotationOnBean(beanName, annotationType) != null) {
+			BeanDefinition bd = this.beanDefinitionMap.get(beanName);
+			if (bd != null && !bd.isAbstract() && findAnnotationOnBean(beanName, annotationType) != null) {
 				result.add(beanName);
 			}
 		}
@@ -717,12 +722,13 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	 * @param resolver the AutowireCandidateResolver to use for the actual resolution algorithm
 	 * @return whether the bean should be considered as autowire candidate
 	 */
-	protected boolean isAutowireCandidate(String beanName, DependencyDescriptor descriptor, AutowireCandidateResolver resolver)
+	protected boolean isAutowireCandidate(
+			String beanName, DependencyDescriptor descriptor, AutowireCandidateResolver resolver)
 			throws NoSuchBeanDefinitionException {
 
-		String beanDefinitionName = BeanFactoryUtils.transformedBeanName(beanName);
-		if (containsBeanDefinition(beanDefinitionName)) {
-			return isAutowireCandidate(beanName, getMergedLocalBeanDefinition(beanDefinitionName), descriptor, resolver);
+		String bdName = BeanFactoryUtils.transformedBeanName(beanName);
+		if (containsBeanDefinition(bdName)) {
+			return isAutowireCandidate(beanName, getMergedLocalBeanDefinition(bdName), descriptor, resolver);
 		}
 		else if (containsSingleton(beanName)) {
 			return isAutowireCandidate(beanName, new RootBeanDefinition(getType(beanName)), descriptor, resolver);
@@ -754,13 +760,16 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	protected boolean isAutowireCandidate(String beanName, RootBeanDefinition mbd,
 			DependencyDescriptor descriptor, AutowireCandidateResolver resolver) {
 
-		String beanDefinitionName = BeanFactoryUtils.transformedBeanName(beanName);
-		resolveBeanClass(mbd, beanDefinitionName);
+		String bdName = BeanFactoryUtils.transformedBeanName(beanName);
+		resolveBeanClass(mbd, bdName);
 		if (mbd.isFactoryMethodUnique && mbd.factoryMethodToIntrospect == null) {
 			new ConstructorResolver(this).resolveFactoryMethodIfPossible(mbd);
 		}
-		return resolver.isAutowireCandidate(
-				new BeanDefinitionHolder(mbd, beanName, getAliases(beanDefinitionName)), descriptor);
+		BeanDefinitionHolder holder = (beanName.equals(bdName) ?
+				this.mergedBeanDefinitionHolders.computeIfAbsent(beanName,
+						key -> new BeanDefinitionHolder(mbd, beanName, getAliases(bdName))) :
+				new BeanDefinitionHolder(mbd, beanName, getAliases(bdName)));
+		return resolver.isAutowireCandidate(holder, descriptor);
 	}
 
 	@Override
@@ -783,9 +792,16 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 		return iterator;
 	}
 
+	@Override
+	protected void clearMergedBeanDefinition(String beanName) {
+		super.clearMergedBeanDefinition(beanName);
+		this.mergedBeanDefinitionHolders.remove(beanName);
+	}
+
 	@Override
 	public void clearMetadataCache() {
 		super.clearMetadataCache();
+		this.mergedBeanDefinitionHolders.clear();
 		clearByTypeCache();
 	}
 
@@ -827,11 +843,11 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 				if (isFactoryBean(beanName)) {
 					Object bean = getBean(FACTORY_BEAN_PREFIX + beanName);
 					if (bean instanceof FactoryBean) {
-						final FactoryBean<?> factory = (FactoryBean<?>) bean;
+						FactoryBean<?> factory = (FactoryBean<?>) bean;
 						boolean isEagerInit;
 						if (System.getSecurityManager() != null && factory instanceof SmartFactoryBean) {
-							isEagerInit = AccessController.doPrivileged((PrivilegedAction<Boolean>)
-											((SmartFactoryBean<?>) factory)::isEagerInit,
+							isEagerInit = AccessController.doPrivileged(
+									(PrivilegedAction<Boolean>) ((SmartFactoryBean<?>) factory)::isEagerInit,
 									getAccessControlContext());
 						}
 						else {
@@ -853,7 +869,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 		for (String beanName : beanNames) {
 			Object singletonInstance = getSingleton(beanName);
 			if (singletonInstance instanceof SmartInitializingSingleton) {
-				final SmartInitializingSingleton smartSingleton = (SmartInitializingSingleton) singletonInstance;
+				SmartInitializingSingleton smartSingleton = (SmartInitializingSingleton) singletonInstance;
 				if (System.getSecurityManager() != null) {
 					AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
 						smartSingleton.afterSingletonsInstantiated();
@@ -942,6 +958,9 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 		if (existingDefinition != null || containsSingleton(beanName)) {
 			resetBeanDefinition(beanName);
 		}
+		else if (isConfigurationFrozen()) {
+			clearByTypeCache();
+		}
 	}
 
 	@Override
@@ -1004,8 +1023,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 		for (String bdName : this.beanDefinitionNames) {
 			if (!beanName.equals(bdName)) {
 				BeanDefinition bd = this.beanDefinitionMap.get(bdName);
-				// Ensure bd is non-null due to potential concurrent modification
-				// of the beanDefinitionMap.
+				// Ensure bd is non-null due to potential concurrent modification of beanDefinitionMap.
 				if (bd != null && beanName.equals(bd.getParentName())) {
 					resetBeanDefinition(bdName);
 				}
@@ -1275,7 +1293,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	private Object resolveMultipleBeans(DependencyDescriptor descriptor, @Nullable String beanName,
 			@Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) {
 
-		final Class<?> type = descriptor.getDependencyType();
+		Class<?> type = descriptor.getDependencyType();
 
 		if (descriptor instanceof StreamDependencyDescriptor) {
 			Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor);
@@ -1668,18 +1686,23 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	 */
 	private void checkBeanNotOfRequiredType(Class<?> type, DependencyDescriptor descriptor) {
 		for (String beanName : this.beanDefinitionNames) {
-			RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
-			Class<?> targetType = mbd.getTargetType();
-			if (targetType != null && type.isAssignableFrom(targetType) &&
-					isAutowireCandidate(beanName, mbd, descriptor, getAutowireCandidateResolver())) {
-				// Probably a proxy interfering with target type match -> throw meaningful exception.
-				Object beanInstance = getSingleton(beanName, false);
-				Class<?> beanType = (beanInstance != null && beanInstance.getClass() != NullBean.class ?
-						beanInstance.getClass() : predictBeanType(beanName, mbd));
-				if (beanType != null && !type.isAssignableFrom(beanType)) {
-					throw new BeanNotOfRequiredTypeException(beanName, type, beanType);
+			try {
+				RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
+				Class<?> targetType = mbd.getTargetType();
+				if (targetType != null && type.isAssignableFrom(targetType) &&
+						isAutowireCandidate(beanName, mbd, descriptor, getAutowireCandidateResolver())) {
+					// Probably a proxy interfering with target type match -> throw meaningful exception.
+					Object beanInstance = getSingleton(beanName, false);
+					Class<?> beanType = (beanInstance != null && beanInstance.getClass() != NullBean.class ?
+							beanInstance.getClass() : predictBeanType(beanName, mbd));
+					if (beanType != null && !type.isAssignableFrom(beanType)) {
+						throw new BeanNotOfRequiredTypeException(beanName, type, beanType);
+					}
 				}
 			}
+			catch (NoSuchBeanDefinitionException ex) {
+				// Bean definition got removed while we were iterating -> ignore.
+			}
 		}
 
 		BeanFactory parent = getParentBeanFactory();

spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultSingletonBeanRegistry.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -70,6 +70,10 @@ import org.springframework.util.StringUtils;
  */
 public class DefaultSingletonBeanRegistry extends SimpleAliasRegistry implements SingletonBeanRegistry {
 
+	/** Maximum number of suppressed exceptions to preserve. */
+	private static final int SUPPRESSED_EXCEPTIONS_LIMIT = 100;
+
+
 	/** Cache of singleton objects: bean name to bean instance. */
 	private final Map<String, Object> singletonObjects = new ConcurrentHashMap<>(256);
 
@@ -90,7 +94,7 @@ public class DefaultSingletonBeanRegistry extends SimpleAliasRegistry implements
 	private final Set<String> inCreationCheckExclusions =
 			Collections.newSetFromMap(new ConcurrentHashMap<>(16));
 
-	/** List of suppressed Exceptions, available for associating related causes. */
+	/** Collection of suppressed Exceptions, available for associating related causes. */
 	@Nullable
 	private Set<Exception> suppressedExceptions;
 
@@ -253,13 +257,17 @@ public class DefaultSingletonBeanRegistry extends SimpleAliasRegistry implements
 	}
 
 	/**
-	 * Register an Exception that happened to get suppressed during the creation of a
+	 * Register an exception that happened to get suppressed during the creation of a
 	 * singleton bean instance, e.g. a temporary circular reference resolution problem.
+	 * <p>The default implementation preserves any given exception in this registry's
+	 * collection of suppressed exceptions, up to a limit of 100 exceptions, adding
+	 * them as related causes to an eventual top-level {@link BeanCreationException}.
 	 * @param ex the Exception to register
+	 * @see BeanCreationException#getRelatedCauses()
 	 */
 	protected void onSuppressedException(Exception ex) {
 		synchronized (this.singletonObjects) {
-			if (this.suppressedExceptions != null) {
+			if (this.suppressedExceptions != null && this.suppressedExceptions.size() < SUPPRESSED_EXCEPTIONS_LIMIT) {
 				this.suppressedExceptions.add(ex);
 			}
 		}

spring-beans/src/main/java/org/springframework/beans/factory/support/FactoryBeanRegistrySupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -54,11 +54,11 @@ public abstract class FactoryBeanRegistrySupport extends DefaultSingletonBeanReg
 	 * or {@code null} if the type cannot be determined yet
 	 */
 	@Nullable
-	protected Class<?> getTypeForFactoryBean(final FactoryBean<?> factoryBean) {
+	protected Class<?> getTypeForFactoryBean(FactoryBean<?> factoryBean) {
 		try {
 			if (System.getSecurityManager() != null) {
-				return AccessController.doPrivileged((PrivilegedAction<Class<?>>)
-						factoryBean::getObjectType, getAccessControlContext());
+				return AccessController.doPrivileged(
+						(PrivilegedAction<Class<?>>) factoryBean::getObjectType, getAccessControlContext());
 			}
 			else {
 				return factoryBean.getObjectType();
@@ -153,9 +153,7 @@ public abstract class FactoryBeanRegistrySupport extends DefaultSingletonBeanReg
 	 * @throws BeanCreationException if FactoryBean object creation failed
 	 * @see org.springframework.beans.factory.FactoryBean#getObject()
 	 */
-	private Object doGetObjectFromFactoryBean(final FactoryBean<?> factory, final String beanName)
-			throws BeanCreationException {
-
+	private Object doGetObjectFromFactoryBean(FactoryBean<?> factory, String beanName) throws BeanCreationException {
 		Object object;
 		try {
 			if (System.getSecurityManager() != null) {

spring-beans/src/main/java/org/springframework/beans/factory/support/SimpleAutowireCandidateResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -40,6 +40,11 @@ public class SimpleAutowireCandidateResolver implements AutowireCandidateResolve
 		return descriptor.isRequired();
 	}
 
+	@Override
+	public boolean hasQualifier(DependencyDescriptor descriptor) {
+		return false;
+	}
+
 	@Override
 	@Nullable
 	public Object getSuggestedValue(DependencyDescriptor descriptor) {

spring-beans/src/main/java/org/springframework/beans/support/ArgumentConvertingMethodInvoker.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -146,8 +146,9 @@ public class ArgumentConvertingMethodInvoker extends MethodInvoker {
 			for (Method candidate : candidates) {
 				if (candidate.getName().equals(targetMethod)) {
 					// Check if the inspected method has the correct number of parameters.
-					Class<?>[] paramTypes = candidate.getParameterTypes();
-					if (paramTypes.length == argCount) {
+					int parameterCount = candidate.getParameterCount();
+					if (parameterCount == argCount) {
+						Class<?>[] paramTypes = candidate.getParameterTypes();
 						Object[] convertedArguments = new Object[argCount];
 						boolean match = true;
 						for (int j = 0; j < argCount && match; j++) {

spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -1399,6 +1399,39 @@ public class DefaultListableBeanFactoryTests {
 		lbf.getBean(TestBean.class);
 	}
 
+	@Test
+	public void testGetBeanByTypeWithLateRegistration() {
+		DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
+		try {
+			lbf.getBean(TestBean.class);
+			fail("Should have thrown NoSuchBeanDefinitionException");
+		}
+		catch (NoSuchBeanDefinitionException ex) {
+			// expected
+		}
+		RootBeanDefinition bd1 = new RootBeanDefinition(TestBean.class);
+		lbf.registerBeanDefinition("bd1", bd1);
+		TestBean bean = lbf.getBean(TestBean.class);
+		assertThat(bean.getBeanName(), equalTo("bd1"));
+	}
+
+	@Test
+	public void testGetBeanByTypeWithLateRegistrationAgainstFrozen() {
+		DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
+		lbf.freezeConfiguration();
+		try {
+			lbf.getBean(TestBean.class);
+			fail("Should have thrown NoSuchBeanDefinitionException");
+		}
+		catch (NoSuchBeanDefinitionException ex) {
+			// expected
+		}
+		RootBeanDefinition bd1 = new RootBeanDefinition(TestBean.class);
+		lbf.registerBeanDefinition("bd1", bd1);
+		TestBean bean = lbf.getBean(TestBean.class);
+		assertThat(bean.getBeanName(), equalTo("bd1"));
+	}
+
 	@Test
 	public void testGetBeanByTypeDefinedInParent() {
 		DefaultListableBeanFactory parent = new DefaultListableBeanFactory();

spring-beans/src/test/java/org/springframework/beans/factory/config/YamlProcessorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -16,12 +16,15 @@
 
 package org.springframework.beans.factory.config;
 
+import java.net.URL;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
+import org.yaml.snakeyaml.constructor.ConstructorException;
 import org.yaml.snakeyaml.parser.ParserException;
 import org.yaml.snakeyaml.scanner.ScannerException;
 
@@ -34,6 +37,7 @@ import static org.junit.Assert.*;
  *
  * @author Dave Syer
  * @author Juergen Hoeller
+ * @author Sam Brannen
  */
 public class YamlProcessorTests {
 
@@ -45,7 +49,7 @@ public class YamlProcessorTests {
 
 	@Test
 	public void arrayConvertedToIndexedBeanReference() {
-		this.processor.setResources(new ByteArrayResource("foo: bar\nbar: [1,2,3]".getBytes()));
+		setYaml("foo: bar\nbar: [1,2,3]");
 		this.processor.process((properties, map) -> {
 			assertEquals(4, properties.size());
 			assertEquals("bar", properties.get("foo"));
@@ -61,13 +65,13 @@ public class YamlProcessorTests {
 
 	@Test
 	public void testStringResource() {
-		this.processor.setResources(new ByteArrayResource("foo # a document that is a literal".getBytes()));
+		setYaml("foo # a document that is a literal");
 		this.processor.process((properties, map) -> assertEquals("foo", map.get("document")));
 	}
 
 	@Test
 	public void testBadDocumentStart() {
-		this.processor.setResources(new ByteArrayResource("foo # a document\nbar: baz".getBytes()));
+		setYaml("foo # a document\nbar: baz");
 		this.exception.expect(ParserException.class);
 		this.exception.expectMessage("line 2, column 1");
 		this.processor.process((properties, map) -> {});
@@ -75,7 +79,7 @@ public class YamlProcessorTests {
 
 	@Test
 	public void testBadResource() {
-		this.processor.setResources(new ByteArrayResource("foo: bar\ncd\nspam:\n  foo: baz".getBytes()));
+		setYaml("foo: bar\ncd\nspam:\n  foo: baz");
 		this.exception.expect(ScannerException.class);
 		this.exception.expectMessage("line 3, column 1");
 		this.processor.process((properties, map) -> {});
@@ -83,7 +87,7 @@ public class YamlProcessorTests {
 
 	@Test
 	public void mapConvertedToIndexedBeanReference() {
-		this.processor.setResources(new ByteArrayResource("foo: bar\nbar:\n spam: bucket".getBytes()));
+		setYaml("foo: bar\nbar:\n spam: bucket");
 		this.processor.process((properties, map) -> {
 			assertEquals("bucket", properties.get("bar.spam"));
 			assertEquals(2, properties.size());
@@ -92,7 +96,7 @@ public class YamlProcessorTests {
 
 	@Test
 	public void integerKeyBehaves() {
-		this.processor.setResources(new ByteArrayResource("foo: bar\n1: bar".getBytes()));
+		setYaml("foo: bar\n1: bar");
 		this.processor.process((properties, map) -> {
 			assertEquals("bar", properties.get("[1]"));
 			assertEquals(2, properties.size());
@@ -101,7 +105,7 @@ public class YamlProcessorTests {
 
 	@Test
 	public void integerDeepKeyBehaves() {
-		this.processor.setResources(new ByteArrayResource("foo:\n  1: bar".getBytes()));
+		setYaml("foo:\n  1: bar");
 		this.processor.process((properties, map) -> {
 			assertEquals("bar", properties.get("foo[1]"));
 			assertEquals(1, properties.size());
@@ -111,7 +115,7 @@ public class YamlProcessorTests {
 	@Test
 	@SuppressWarnings("unchecked")
 	public void flattenedMapIsSameAsPropertiesButOrdered() {
-		this.processor.setResources(new ByteArrayResource("foo: bar\nbar:\n spam: bucket".getBytes()));
+		setYaml("foo: bar\nbar:\n spam: bucket");
 		this.processor.process((properties, map) -> {
 			assertEquals("bucket", properties.get("bar.spam"));
 			assertEquals(2, properties.size());
@@ -124,4 +128,47 @@ public class YamlProcessorTests {
 		});
 	}
 
+	@Test
+	public void customTypeSupportedByDefault() throws Exception {
+		URL url = new URL("https://localhost:9000/");
+		setYaml("value: !!java.net.URL [\"" + url + "\"]");
+
+		this.processor.process((properties, map) -> {
+			assertEquals(1, properties.size());
+			assertEquals(1, map.size());
+			assertEquals(url, properties.get("value"));
+			assertEquals(url, map.get("value"));
+		});
+	}
+
+	@Test
+	public void customTypesSupportedDueToExplicitConfiguration() throws Exception {
+		this.processor.setSupportedTypes(URL.class, String.class);
+
+		URL url = new URL("https://localhost:9000/");
+		setYaml("value: !!java.net.URL [!!java.lang.String [\"" + url + "\"]]");
+
+		this.processor.process((properties, map) -> {
+			assertEquals(1, properties.size());
+			assertEquals(1, map.size());
+			assertEquals(url, properties.get("value"));
+			assertEquals(url, map.get("value"));
+		});
+	}
+
+	@Test
+	public void customTypeNotSupportedDueToExplicitConfiguration() {
+		this.processor.setSupportedTypes(List.class);
+
+		setYaml("value: !!java.net.URL [\"https://localhost:9000/\"]");
+
+		this.exception.expect(ConstructorException.class);
+		this.exception.expectMessage("Unsupported type encountered in YAML document: java.net.URL");
+		this.processor.process((properties, map) -> {});
+	}
+
+	private void setYaml(String yaml) {
+		this.processor.setResources(new ByteArrayResource(yaml.getBytes()));
+	}
+
 }

spring-context-support/spring-context-support.gradle

@@ -16,7 +16,7 @@ dependencies {
 	optional("org.freemarker:freemarker:${freemarkerVersion}")
 	testCompile(project(":spring-context"))
 	testCompile("org.hsqldb:hsqldb:${hsqldbVersion}")
-	testCompile("org.hibernate:hibernate-validator:6.0.18.Final")
+	testCompile("org.hibernate:hibernate-validator:6.0.20.Final")
 	testCompile("javax.annotation:javax.annotation-api:1.3.2")
 	testRuntime("org.ehcache:jcache:1.0.1")
 	testRuntime("org.ehcache:ehcache:3.4.0")

spring-context-support/src/main/java/org/springframework/cache/caffeine/CaffeineCache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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 +35,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @since 4.3
+ * @see CaffeineCacheManager
  */
 public class CaffeineCache extends AbstractValueAdaptingCache {
 

spring-context-support/src/main/java/org/springframework/cache/ehcache/EhCacheCache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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 +34,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @since 3.1
+ * @see EhCacheCacheManager
  */
 public class EhCacheCache implements Cache {
 
@@ -95,7 +96,6 @@ public class EhCacheCache implements Cache {
 				this.cache.releaseWriteLockOnKey(key);
 			}
 		}
-
 	}
 
 	private <T> T loadValue(Object key, Callable<T> valueLoader) {

spring-context-support/src/main/java/org/springframework/cache/ehcache/EhCacheCacheManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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 +34,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @since 3.1
+ * @see EhCacheCache
  */
 public class EhCacheCacheManager extends AbstractTransactionSupportingCacheManager {
 

spring-context-support/src/main/java/org/springframework/cache/jcache/JCacheCache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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 +36,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @since 3.2
+ * @see JCacheCacheManager
  */
 public class JCacheCache extends AbstractValueAdaptingCache {
 

spring-context-support/src/main/java/org/springframework/cache/jcache/JCacheCacheManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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 +36,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @since 3.2
+ * @see JCacheCache
  */
 public class JCacheCacheManager extends AbstractTransactionSupportingCacheManager {
 

spring-context-support/src/main/java/org/springframework/cache/jcache/config/AbstractJCacheConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -39,7 +39,7 @@ import org.springframework.lang.Nullable;
  * @see JCacheConfigurer
  */
 @Configuration
-public class AbstractJCacheConfiguration extends AbstractCachingConfiguration {
+public abstract class AbstractJCacheConfiguration extends AbstractCachingConfiguration {
 
 	@Nullable
 	protected Supplier<CacheResolver> exceptionCacheResolver;

spring-context-support/src/main/java/org/springframework/scheduling/commonj/WorkManagerTaskExecutor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -58,13 +58,13 @@ import org.springframework.util.concurrent.ListenableFutureTask;
  * <p>The CommonJ WorkManager will usually be retrieved from the application
  * server's JNDI environment, as defined in the server's management console.
  *
- * <p>Note: On the upcoming EE 7 compliant versions of WebLogic and WebSphere, a
+ * <p>Note: On EE 7/8 compliant versions of WebLogic and WebSphere, a
  * {@link org.springframework.scheduling.concurrent.DefaultManagedTaskExecutor}
- * should be preferred, following JSR-236 support in Java EE 7.
+ * should be preferred, following JSR-236 support in Java EE 7/8.
  *
  * @author Juergen Hoeller
  * @since 2.0
- * @deprecated as of 5.1, in favor of EE 7's
+ * @deprecated as of 5.1, in favor of the EE 7/8 based
  * {@link org.springframework.scheduling.concurrent.DefaultManagedTaskExecutor}
  */
 @Deprecated
@@ -121,6 +121,11 @@ public class WorkManagerTaskExecutor extends JndiLocatorSupport
 	 * execution callback (which may be a wrapper around the user-supplied task).
 	 * <p>The primary use case is to set some execution context around the task's
 	 * invocation, or to provide some monitoring/statistics for task execution.
+	 * <p><b>NOTE:</b> Exception handling in {@code TaskDecorator} implementations
+	 * is limited to plain {@code Runnable} execution via {@code execute} calls.
+	 * In case of {@code #submit} calls, the exposed {@code Runnable} will be a
+	 * {@code FutureTask} which does not propagate any exceptions; you might
+	 * have to cast it and call {@code Future#get} to evaluate exceptions.
 	 * @since 4.3
 	 */
 	public void setTaskDecorator(TaskDecorator taskDecorator) {

spring-context/spring-context.gradle

@@ -18,7 +18,7 @@ dependencies {
 	optional("javax.xml.ws:jaxws-api:2.3.1")
 	optional("org.aspectj:aspectjweaver:${aspectjVersion}")
 	optional("org.codehaus.groovy:groovy:${groovyVersion}")
-	optional("org.beanshell:bsh:2.0b5")
+	optional("org.apache-extras.beanshell:bsh:2.0b6")
 	optional("joda-time:joda-time:2.10.5")
 	optional("org.hibernate:hibernate-validator:5.4.3.Final")
 	optional("org.jetbrains.kotlin:kotlin-reflect:${kotlinVersion}")

spring-context/src/main/java/org/springframework/cache/concurrent/ConcurrentMapCache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -191,7 +191,7 @@ public class ConcurrentMapCache extends AbstractValueAdaptingCache {
 	}
 
 	private Object serializeValue(SerializationDelegate serialization, Object storeValue) throws IOException {
-		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
 		try {
 			serialization.serialize(storeValue, out);
 			return out.toByteArray();

spring-context/src/main/java/org/springframework/cache/concurrent/ConcurrentMapCacheManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -190,9 +190,7 @@ public class ConcurrentMapCacheManager implements CacheManager, BeanClassLoaderA
 	 */
 	protected Cache createConcurrentMapCache(String name) {
 		SerializationDelegate actualSerialization = (isStoreByValue() ? this.serialization : null);
-		return new ConcurrentMapCache(name, new ConcurrentHashMap<>(256),
-				isAllowNullValues(), actualSerialization);
-
+		return new ConcurrentMapCache(name, new ConcurrentHashMap<>(256), isAllowNullValues(), actualSerialization);
 	}
 
 }

spring-context/src/main/java/org/springframework/cache/interceptor/CacheAspectSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -52,6 +52,7 @@ import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
 import org.springframework.util.ObjectUtils;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.util.function.SingletonSupplier;
 import org.springframework.util.function.SupplierUtils;
@@ -381,9 +382,9 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 					return wrapCacheValue(method, cache.get(key, () -> unwrapReturnValue(invokeOperation(invoker))));
 				}
 				catch (Cache.ValueRetrievalException ex) {
-					// The invoker wraps any Throwable in a ThrowableWrapper instance so we
-					// can just make sure that one bubbles up the stack.
-					throw (CacheOperationInvoker.ThrowableWrapper) ex.getCause();
+					// Directly propagate ThrowableWrapper from the invoker,
+					// or potentially also an IllegalArgumentException etc.
+					ReflectionUtils.rethrowRuntimeException(ex.getCause());
 				}
 			}
 			else {

spring-context/src/main/java/org/springframework/cache/support/NoOpCache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -30,6 +30,7 @@ import org.springframework.util.Assert;
  * @author Costin Leau
  * @author Stephane Nicoll
  * @since 4.3.4
+ * @see NoOpCacheManager
  */
 public class NoOpCache implements Cache {
 

spring-context/src/main/java/org/springframework/cache/support/NoOpCacheManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -37,7 +37,7 @@ import org.springframework.lang.Nullable;
  * @author Costin Leau
  * @author Stephane Nicoll
  * @since 3.1
- * @see CompositeCacheManager
+ * @see NoOpCache
  */
 public class NoOpCacheManager implements CacheManager {
 

spring-context/src/main/java/org/springframework/context/ConfigurableApplicationContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -148,11 +148,12 @@ public interface ConfigurableApplicationContext extends ApplicationContext, Life
 	void addProtocolResolver(ProtocolResolver resolver);
 
 	/**
-	 * Load or refresh the persistent representation of the configuration,
-	 * which might an XML file, properties file, or relational database schema.
+	 * Load or refresh the persistent representation of the configuration, which
+	 * might be from Java-based configuration, an XML file, a properties file, a
+	 * relational database schema, or some other format.
 	 * <p>As this is a startup method, it should destroy already created singletons
 	 * if it fails, to avoid dangling resources. In other words, after invocation
-	 * of that method, either all or no singletons at all should be instantiated.
+	 * of this method, either all or no singletons at all should be instantiated.
 	 * @throws BeansException if the bean factory could not be initialized
 	 * @throws IllegalStateException if already initialized and multiple refresh
 	 * attempts are not supported

spring-context/src/main/java/org/springframework/context/annotation/AutoProxyRegistrar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -33,7 +33,8 @@ import org.springframework.core.type.AnnotationMetadata;
  *
  * @author Chris Beams
  * @since 3.1
- * @see EnableAspectJAutoProxy
+ * @see org.springframework.cache.annotation.EnableCaching
+ * @see org.springframework.transaction.annotation.EnableTransactionManagement
  */
 public class AutoProxyRegistrar implements ImportBeanDefinitionRegistrar {
 

spring-context/src/main/java/org/springframework/context/annotation/ClassPathScanningCandidateComponentProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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 +29,6 @@ import org.apache.commons.logging.LogFactory;
 
 import org.springframework.beans.factory.BeanDefinitionStoreException;
 import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
-import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
 import org.springframework.beans.factory.annotation.Lookup;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
@@ -386,8 +385,8 @@ public class ClassPathScanningCandidateComponentProvider implements EnvironmentC
 			for (String type : types) {
 				MetadataReader metadataReader = getMetadataReaderFactory().getMetadataReader(type);
 				if (isCandidateComponent(metadataReader)) {
-					AnnotatedGenericBeanDefinition sbd = new AnnotatedGenericBeanDefinition(
-							metadataReader.getAnnotationMetadata());
+					ScannedGenericBeanDefinition sbd = new ScannedGenericBeanDefinition(metadataReader);
+					sbd.setSource(metadataReader.getResource());
 					if (isCandidateComponent(sbd)) {
 						if (debugEnabled) {
 							logger.debug("Using candidate component class from index: " + type);
@@ -430,7 +429,6 @@ public class ClassPathScanningCandidateComponentProvider implements EnvironmentC
 						MetadataReader metadataReader = getMetadataReaderFactory().getMetadataReader(resource);
 						if (isCandidateComponent(metadataReader)) {
 							ScannedGenericBeanDefinition sbd = new ScannedGenericBeanDefinition(metadataReader);
-							sbd.setResource(resource);
 							sbd.setSource(resource);
 							if (isCandidateComponent(sbd)) {
 								if (debugEnabled) {

spring-context/src/main/java/org/springframework/context/annotation/Configuration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -344,9 +344,9 @@ import org.springframework.stereotype.Component;
  *
  * <p>By default, {@code @Bean} methods will be <em>eagerly instantiated</em> at container
  * bootstrap time.  To avoid this, {@code @Configuration} may be used in conjunction with
- * the {@link Lazy @Lazy} annotation to indicate that all {@code @Bean} methods declared within
- * the class are by default lazily initialized. Note that {@code @Lazy} may be used on
- * individual {@code @Bean} methods as well.
+ * the {@link Lazy @Lazy} annotation to indicate that all {@code @Bean} methods declared
+ * within the class are by default lazily initialized. Note that {@code @Lazy} may be used
+ * on individual {@code @Bean} methods as well.
  *
  * <h2>Testing support for {@code @Configuration} classes</h2>
  *

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassBeanDefinitionReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -209,7 +209,6 @@ class ConfigurationClassBeanDefinitionReader {
 		}
 
 		ConfigurationClassBeanDefinition beanDef = new ConfigurationClassBeanDefinition(configClass, metadata);
-		beanDef.setResource(configClass.getResource());
 		beanDef.setSource(this.sourceExtractor.extractSource(metadata, configClass.getResource()));
 
 		if (metadata.isStatic()) {
@@ -381,6 +380,7 @@ class ConfigurationClassBeanDefinitionReader {
 		public ConfigurationClassBeanDefinition(ConfigurationClass configClass, MethodMetadata beanMethodMetadata) {
 			this.annotationMetadata = configClass.getMetadata();
 			this.factoryMethodMetadata = beanMethodMetadata;
+			setResource(configClass.getResource());
 			setLenientConstructorResolution(false);
 		}
 

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -748,8 +748,7 @@ class ConfigurationClassParser {
 		 * @param importSelector the selector to handle
 		 */
 		public void handle(ConfigurationClass configClass, DeferredImportSelector importSelector) {
-			DeferredImportSelectorHolder holder = new DeferredImportSelectorHolder(
-					configClass, importSelector);
+			DeferredImportSelectorHolder holder = new DeferredImportSelectorHolder(configClass, importSelector);
 			if (this.deferredImportSelectors == null) {
 				DeferredImportSelectorGroupingHandler handler = new DeferredImportSelectorGroupingHandler();
 				handler.register(holder);
@@ -775,7 +774,6 @@ class ConfigurationClassParser {
 				this.deferredImportSelectors = new ArrayList<>();
 			}
 		}
-
 	}
 
 
@@ -786,8 +784,7 @@ class ConfigurationClassParser {
 		private final Map<AnnotationMetadata, ConfigurationClass> configurationClasses = new HashMap<>();
 
 		public void register(DeferredImportSelectorHolder deferredImport) {
-			Class<? extends Group> group = deferredImport.getImportSelector()
-					.getImportGroup();
+			Class<? extends Group> group = deferredImport.getImportSelector().getImportGroup();
 			DeferredImportSelectorGrouping grouping = this.groupings.computeIfAbsent(
 					(group != null ? group : deferredImport),
 					key -> new DeferredImportSelectorGrouping(createGroup(group)));
@@ -799,8 +796,7 @@ class ConfigurationClassParser {
 		public void processGroupImports() {
 			for (DeferredImportSelectorGrouping grouping : this.groupings.values()) {
 				grouping.getImports().forEach(entry -> {
-					ConfigurationClass configurationClass = this.configurationClasses.get(
-							entry.getMetadata());
+					ConfigurationClass configurationClass = this.configurationClasses.get(entry.getMetadata());
 					try {
 						processImports(configurationClass, asSourceClass(configurationClass),
 								asSourceClasses(entry.getImportClassName()), false);
@@ -818,8 +814,7 @@ class ConfigurationClassParser {
 		}
 
 		private Group createGroup(@Nullable Class<? extends Group> type) {
-			Class<? extends Group> effectiveType = (type != null ? type
-					: DefaultDeferredImportSelectorGroup.class);
+			Class<? extends Group> effectiveType = (type != null ? type : DefaultDeferredImportSelectorGroup.class);
 			Group group = BeanUtils.instantiateClass(effectiveType);
 			ParserStrategyUtils.invokeAwareMethods(group,
 					ConfigurationClassParser.this.environment,
@@ -827,7 +822,6 @@ class ConfigurationClassParser {
 					ConfigurationClassParser.this.registry);
 			return group;
 		}
-
 	}
 
 

spring-context/src/main/java/org/springframework/context/annotation/DeferredImportSelector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -51,6 +51,7 @@ public interface DeferredImportSelector extends ImportSelector {
 
 	/**
 	 * Interface used to group results from different import selectors.
+	 * @since 5.0
 	 */
 	interface Group {
 

spring-context/src/main/java/org/springframework/context/annotation/ImportSelector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2020 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 @@ public interface ImportSelector {
 	/**
 	 * Select and return the names of which class(es) should be imported based on
 	 * the {@link AnnotationMetadata} of the importing @{@link Configuration} class.
+	 * @return the class names, or an empty array if none
 	 */
 	String[] selectImports(AnnotationMetadata importingClassMetadata);
 

spring-context/src/main/java/org/springframework/context/annotation/LoadTimeWeavingConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -42,6 +42,7 @@ import org.springframework.util.Assert;
  * @see ConfigurableApplicationContext#LOAD_TIME_WEAVER_BEAN_NAME
  */
 @Configuration
+@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
 public class LoadTimeWeavingConfiguration implements ImportAware, BeanClassLoaderAware {
 
 	@Nullable

spring-context/src/main/java/org/springframework/context/annotation/MBeanExportConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.util.StringUtils;
  * @see EnableMBeanExport
  */
 @Configuration
+@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
 public class MBeanExportConfiguration implements ImportAware, EnvironmentAware, BeanFactoryAware {
 
 	private static final String MBEAN_EXPORTER_BEAN_NAME = "mbeanExporter";

spring-context/src/main/java/org/springframework/context/annotation/PropertySource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -170,8 +170,11 @@ import org.springframework.core.io.support.PropertySourceFactory;
 public @interface PropertySource {
 
 	/**
-	 * Indicate the name of this property source. If omitted, a name will
-	 * be generated based on the description of the underlying resource.
+	 * Indicate the name of this property source. If omitted, the {@link #factory()}
+	 * will generate a name based on the underlying resource (in the case of
+	 * {@link org.springframework.core.io.support.DefaultPropertySourceFactory}:
+	 * derived from the resource description through a corresponding name-less
+	 * {@link org.springframework.core.io.support.ResourcePropertySource} constructor).
 	 * @see org.springframework.core.env.PropertySource#getName()
 	 * @see org.springframework.core.io.Resource#getDescription()
 	 */

spring-context/src/main/java/org/springframework/context/annotation/ScannedGenericBeanDefinition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -60,6 +60,7 @@ public class ScannedGenericBeanDefinition extends GenericBeanDefinition implemen
 		Assert.notNull(metadataReader, "MetadataReader must not be null");
 		this.metadata = metadataReader.getAnnotationMetadata();
 		setBeanClassName(this.metadata.getClassName());
+		setResource(metadataReader.getResource());
 	}
 
 

spring-context/src/main/java/org/springframework/context/annotation/ScopedProxyMode.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -53,6 +53,6 @@ public enum ScopedProxyMode {
 	/**
 	 * Create a class-based proxy (uses CGLIB).
 	 */
-	TARGET_CLASS;
+	TARGET_CLASS
 
 }

spring-context/src/main/java/org/springframework/context/index/CandidateComponentsIndex.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -57,6 +57,19 @@ public class CandidateComponentsIndex {
 		this.index = parseIndex(content);
 	}
 
+	private static MultiValueMap<String, Entry> parseIndex(List<Properties> content) {
+		MultiValueMap<String, Entry> index = new LinkedMultiValueMap<>();
+		for (Properties entry : content) {
+			entry.forEach((type, values) -> {
+				String[] stereotypes = ((String) values).split(",");
+				for (String stereotype : stereotypes) {
+					index.add(stereotype, new Entry((String) type));
+				}
+			});
+		}
+		return index;
+	}
+
 
 	/**
 	 * Return the candidate types that are associated with the specified stereotype.
@@ -76,21 +89,11 @@ public class CandidateComponentsIndex {
 		return Collections.emptySet();
 	}
 
-	private static MultiValueMap<String, Entry> parseIndex(List<Properties> content) {
-		MultiValueMap<String, Entry> index = new LinkedMultiValueMap<>();
-		for (Properties entry : content) {
-			entry.forEach((type, values) -> {
-				String[] stereotypes = ((String) values).split(",");
-				for (String stereotype : stereotypes) {
-					index.add(stereotype, new Entry((String) type));
-				}
-			});
-		}
-		return index;
-	}
 
 	private static class Entry {
+
 		private final String type;
+
 		private final String packageName;
 
 		Entry(String type) {
@@ -106,7 +109,6 @@ public class CandidateComponentsIndex {
 				return this.type.startsWith(basePackage);
 			}
 		}
-
 	}
 
 }

spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -79,6 +79,7 @@ import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
 import org.springframework.core.io.support.ResourcePatternResolver;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.ReflectionUtils;
 
@@ -835,7 +836,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 		// Publish early application events now that we finally have a multicaster...
 		Set<ApplicationEvent> earlyEventsToProcess = this.earlyApplicationEvents;
 		this.earlyApplicationEvents = null;
-		if (earlyEventsToProcess != null) {
+		if (!CollectionUtils.isEmpty(earlyEventsToProcess)) {
 			for (ApplicationEvent earlyEvent : earlyEventsToProcess) {
 				getApplicationEventMulticaster().multicastEvent(earlyEvent);
 			}

spring-context/src/main/java/org/springframework/context/support/AbstractRefreshableApplicationContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -72,10 +72,7 @@ public abstract class AbstractRefreshableApplicationContext extends AbstractAppl
 
 	/** Bean factory for this context. */
 	@Nullable
-	private DefaultListableBeanFactory beanFactory;
-
-	/** Synchronization monitor for the internal BeanFactory. */
-	private final Object beanFactoryMonitor = new Object();
+	private volatile DefaultListableBeanFactory beanFactory;
 
 
 	/**
@@ -131,9 +128,7 @@ public abstract class AbstractRefreshableApplicationContext extends AbstractAppl
 			beanFactory.setSerializationId(getId());
 			customizeBeanFactory(beanFactory);
 			loadBeanDefinitions(beanFactory);
-			synchronized (this.beanFactoryMonitor) {
-				this.beanFactory = beanFactory;
-			}
+			this.beanFactory = beanFactory;
 		}
 		catch (IOException ex) {
 			throw new ApplicationContextException("I/O error parsing bean definition source for " + getDisplayName(), ex);
@@ -142,21 +137,19 @@ public abstract class AbstractRefreshableApplicationContext extends AbstractAppl
 
 	@Override
 	protected void cancelRefresh(BeansException ex) {
-		synchronized (this.beanFactoryMonitor) {
-			if (this.beanFactory != null) {
-				this.beanFactory.setSerializationId(null);
-			}
+		DefaultListableBeanFactory beanFactory = this.beanFactory;
+		if (beanFactory != null) {
+			beanFactory.setSerializationId(null);
 		}
 		super.cancelRefresh(ex);
 	}
 
 	@Override
 	protected final void closeBeanFactory() {
-		synchronized (this.beanFactoryMonitor) {
-			if (this.beanFactory != null) {
-				this.beanFactory.setSerializationId(null);
-				this.beanFactory = null;
-			}
+		DefaultListableBeanFactory beanFactory = this.beanFactory;
+		if (beanFactory != null) {
+			beanFactory.setSerializationId(null);
+			this.beanFactory = null;
 		}
 	}
 
@@ -165,20 +158,17 @@ public abstract class AbstractRefreshableApplicationContext extends AbstractAppl
 	 * i.e. has been refreshed at least once and not been closed yet.
 	 */
 	protected final boolean hasBeanFactory() {
-		synchronized (this.beanFactoryMonitor) {
-			return (this.beanFactory != null);
-		}
+		return (this.beanFactory != null);
 	}
 
 	@Override
 	public final ConfigurableListableBeanFactory getBeanFactory() {
-		synchronized (this.beanFactoryMonitor) {
-			if (this.beanFactory == null) {
-				throw new IllegalStateException("BeanFactory not initialized or already closed - " +
-						"call 'refresh' before accessing beans via the ApplicationContext");
-			}
-			return this.beanFactory;
+		DefaultListableBeanFactory beanFactory = this.beanFactory;
+		if (beanFactory == null) {
+			throw new IllegalStateException("BeanFactory not initialized or already closed - " +
+					"call 'refresh' before accessing beans via the ApplicationContext");
 		}
+		return beanFactory;
 	}
 
 	/**

spring-context/src/main/java/org/springframework/context/support/AbstractResourceBasedMessageSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -160,8 +160,9 @@ public abstract class AbstractResourceBasedMessageSource extends AbstractMessage
 	/**
 	 * Set the number of seconds to cache loaded properties files.
 	 * <ul>
-	 * <li>Default is "-1", indicating to cache forever (just like
-	 * {@code java.util.ResourceBundle}).
+	 * <li>Default is "-1", indicating to cache forever (matching the default behavior
+	 * of {@code java.util.ResourceBundle}). Note that this constant follows Spring
+	 * conventions, not {@link java.util.ResourceBundle.Control#getTimeToLive}.
 	 * <li>A positive number will cache loaded properties files for the given
 	 * number of seconds. This is essentially the interval between refresh checks.
 	 * Note that a refresh attempt will first check the last-modified timestamp
@@ -184,8 +185,9 @@ public abstract class AbstractResourceBasedMessageSource extends AbstractMessage
 	 * Set the number of milliseconds to cache loaded properties files.
 	 * Note that it is common to set seconds instead: {@link #setCacheSeconds}.
 	 * <ul>
-	 * <li>Default is "-1", indicating to cache forever (just like
-	 * {@code java.util.ResourceBundle}).
+	 * <li>Default is "-1", indicating to cache forever (matching the default behavior
+	 * of {@code java.util.ResourceBundle}). Note that this constant follows Spring
+	 * conventions, not {@link java.util.ResourceBundle.Control#getTimeToLive}.
 	 * <li>A positive number will cache loaded properties files for the given
 	 * number of milliseconds. This is essentially the interval between refresh checks.
 	 * Note that a refresh attempt will first check the last-modified timestamp

spring-context/src/main/java/org/springframework/ejb/config/AbstractJndiLocatingBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -49,8 +49,9 @@ abstract class AbstractJndiLocatingBeanDefinitionParser extends AbstractSimpleBe
 
 	@Override
 	protected boolean isEligibleAttribute(String attributeName) {
-		return (super.isEligibleAttribute(attributeName) && !ENVIRONMENT_REF.equals(attributeName) && !LAZY_INIT_ATTRIBUTE
-				.equals(attributeName));
+		return (super.isEligibleAttribute(attributeName) &&
+				!ENVIRONMENT_REF.equals(attributeName) &&
+				!LAZY_INIT_ATTRIBUTE.equals(attributeName));
 	}
 
 	@Override

spring-context/src/main/java/org/springframework/jmx/export/metadata/AbstractJmxAttribute.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2007 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -22,7 +22,7 @@ package org.springframework.jmx.export.metadata;
  * @author Rob Harrop
  * @since 1.2
  */
-public class AbstractJmxAttribute {
+public abstract class AbstractJmxAttribute {
 
 	private String description = "";
 

spring-context/src/main/java/org/springframework/jmx/support/RegistrationPolicy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -42,6 +42,6 @@ public enum RegistrationPolicy {
 	 * Registration should replace the affected MBean when attempting to register an MBean
 	 * under a name that already exists.
 	 */
-	REPLACE_EXISTING;
+	REPLACE_EXISTING
 
 }

spring-context/src/main/java/org/springframework/scheduling/annotation/ScheduledAnnotationBeanPostProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -254,7 +254,10 @@ public class ScheduledAnnotationBeanPostProcessor
 				this.registrar.setTaskScheduler(resolveSchedulerBean(this.beanFactory, TaskScheduler.class, false));
 			}
 			catch (NoUniqueBeanDefinitionException ex) {
-				logger.trace("Could not find unique TaskScheduler bean", ex);
+				if (logger.isTraceEnabled()) {
+					logger.trace("Could not find unique TaskScheduler bean - attempting to resolve by name: " +
+							ex.getMessage());
+				}
 				try {
 					this.registrar.setTaskScheduler(resolveSchedulerBean(this.beanFactory, TaskScheduler.class, true));
 				}
@@ -269,13 +272,19 @@ public class ScheduledAnnotationBeanPostProcessor
 				}
 			}
 			catch (NoSuchBeanDefinitionException ex) {
-				logger.trace("Could not find default TaskScheduler bean", ex);
+				if (logger.isTraceEnabled()) {
+					logger.trace("Could not find default TaskScheduler bean - attempting to find ScheduledExecutorService: " +
+							ex.getMessage());
+				}
 				// Search for ScheduledExecutorService bean next...
 				try {
 					this.registrar.setScheduler(resolveSchedulerBean(this.beanFactory, ScheduledExecutorService.class, false));
 				}
 				catch (NoUniqueBeanDefinitionException ex2) {
-					logger.trace("Could not find unique ScheduledExecutorService bean", ex2);
+					if (logger.isTraceEnabled()) {
+						logger.trace("Could not find unique ScheduledExecutorService bean - attempting to resolve by name: " +
+								ex2.getMessage());
+					}
 					try {
 						this.registrar.setScheduler(resolveSchedulerBean(this.beanFactory, ScheduledExecutorService.class, true));
 					}
@@ -290,7 +299,10 @@ public class ScheduledAnnotationBeanPostProcessor
 					}
 				}
 				catch (NoSuchBeanDefinitionException ex2) {
-					logger.trace("Could not find default ScheduledExecutorService bean", ex2);
+					if (logger.isTraceEnabled()) {
+						logger.trace("Could not find default ScheduledExecutorService bean - falling back to default: " +
+								ex2.getMessage());
+					}
 					// Giving up -> falling back to default scheduler within the registrar...
 					logger.info("No TaskScheduler/ScheduledExecutorService bean found for scheduled processing");
 				}

spring-context/src/main/java/org/springframework/scheduling/concurrent/ConcurrentTaskExecutor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -130,6 +130,11 @@ public class ConcurrentTaskExecutor implements AsyncListenableTaskExecutor, Sche
 	 * execution callback (which may be a wrapper around the user-supplied task).
 	 * <p>The primary use case is to set some execution context around the task's
 	 * invocation, or to provide some monitoring/statistics for task execution.
+	 * <p><b>NOTE:</b> Exception handling in {@code TaskDecorator} implementations
+	 * is limited to plain {@code Runnable} execution via {@code execute} calls.
+	 * In case of {@code #submit} calls, the exposed {@code Runnable} will be a
+	 * {@code FutureTask} which does not propagate any exceptions; you might
+	 * have to cast it and call {@code Future#get} to evaluate exceptions.
 	 * @since 4.3
 	 */
 	public final void setTaskDecorator(TaskDecorator taskDecorator) {

spring-context/src/main/java/org/springframework/scheduling/concurrent/DefaultManagedTaskExecutor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -28,7 +28,7 @@ import org.springframework.lang.Nullable;
 
 /**
  * JNDI-based variant of {@link ConcurrentTaskExecutor}, performing a default lookup for
- * JSR-236's "java:comp/DefaultManagedExecutorService" in a Java EE 7 environment.
+ * JSR-236's "java:comp/DefaultManagedExecutorService" in a Java EE 7/8 environment.
  *
  * <p>Note: This class is not strictly JSR-236 based; it can work with any regular
  * {@link java.util.concurrent.Executor} that can be found in JNDI.
@@ -37,10 +37,11 @@ import org.springframework.lang.Nullable;
  *
  * @author Juergen Hoeller
  * @since 4.0
+ * @see javax.enterprise.concurrent.ManagedExecutorService
  */
 public class DefaultManagedTaskExecutor extends ConcurrentTaskExecutor implements InitializingBean {
 
-	private JndiLocatorDelegate jndiLocator = new JndiLocatorDelegate();
+	private final JndiLocatorDelegate jndiLocator = new JndiLocatorDelegate();
 
 	@Nullable
 	private String jndiName = "java:comp/DefaultManagedExecutorService";

spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolTaskExecutor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -205,6 +205,13 @@ public class ThreadPoolTaskExecutor extends ExecutorConfigurationSupport
 	 * execution callback (which may be a wrapper around the user-supplied task).
 	 * <p>The primary use case is to set some execution context around the task's
 	 * invocation, or to provide some monitoring/statistics for task execution.
+	 * <p><b>NOTE:</b> Exception handling in {@code TaskDecorator} implementations
+	 * is limited to plain {@code Runnable} execution via {@code execute} calls.
+	 * In case of {@code #submit} calls, the exposed {@code Runnable} will be a
+	 * {@code FutureTask} which does not propagate any exceptions; you might
+	 * have to cast it and call {@code Future#get} to evaluate exceptions.
+	 * See the {@code ThreadPoolExecutor#afterExecute} javadoc for an example
+	 * of how to access exceptions in such a {@code Future} case.
 	 * @since 4.3
 	 */
 	public void setTaskDecorator(TaskDecorator taskDecorator) {

spring-context/src/main/java/org/springframework/scripting/groovy/GroovyScriptFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -158,7 +158,14 @@ public class GroovyScriptFactory implements ScriptFactory, BeanFactoryAware, Bea
 
 	@Override
 	public void setBeanClassLoader(ClassLoader classLoader) {
-		this.groovyClassLoader = buildGroovyClassLoader(classLoader);
+		if (classLoader instanceof GroovyClassLoader &&
+				(this.compilerConfiguration == null ||
+						((GroovyClassLoader) classLoader).hasCompatibleConfiguration(this.compilerConfiguration))) {
+			this.groovyClassLoader = (GroovyClassLoader) classLoader;
+		}
+		else {
+			this.groovyClassLoader = buildGroovyClassLoader(classLoader);
+		}
 	}
 
 	/**

spring-context/src/main/java/org/springframework/validation/beanvalidation/MethodValidationInterceptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -50,7 +50,7 @@ import org.springframework.validation.annotation.Validated;
  * at the type level of the containing target class, applying to all public service methods
  * of that class. By default, JSR-303 will validate against its default group only.
  *
- * <p>As of Spring 5.0, this functionality requires a Bean Validation 1.1 provider.
+ * <p>As of Spring 5.0, this functionality requires a Bean Validation 1.1+ provider.
  *
  * @author Juergen Hoeller
  * @since 3.1
@@ -87,7 +87,6 @@ public class MethodValidationInterceptor implements MethodInterceptor {
 
 
 	@Override
-	@SuppressWarnings("unchecked")
 	public Object invoke(MethodInvocation invocation) throws Throwable {
 		// Avoid Validator invocation on FactoryBean.getObjectType/isSingleton
 		if (isFactoryBeanMetadataMethod(invocation.getMethod())) {

spring-context/src/main/java/org/springframework/validation/beanvalidation/MethodValidationPostProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -50,7 +50,7 @@ import org.springframework.validation.annotation.Validated;
  * inline constraint annotations. Validation groups can be specified through {@code @Validated}
  * as well. By default, JSR-303 will validate against its default group only.
  *
- * <p>As of Spring 5.0, this functionality requires a Bean Validation 1.1 provider.
+ * <p>As of Spring 5.0, this functionality requires a Bean Validation 1.1+ provider.
  *
  * @author Juergen Hoeller
  * @since 3.1

spring-context/src/test/java/org/springframework/cache/CacheReproTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -397,7 +397,6 @@ public class CacheReproTests {
 		public TestBean insertItem(TestBean item) {
 			return item;
 		}
-
 	}
 
 

spring-context/src/test/java/org/springframework/cache/concurrent/ConcurrentMapCacheTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -35,8 +35,7 @@ import static org.junit.Assert.*;
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  */
-public class ConcurrentMapCacheTests
-		extends AbstractValueAdaptingCacheTests<ConcurrentMapCache> {
+public class ConcurrentMapCacheTests extends AbstractValueAdaptingCacheTests<ConcurrentMapCache> {
 
 	protected ConcurrentMap<Object, Object> nativeCache;
 
@@ -48,12 +47,11 @@ public class ConcurrentMapCacheTests
 
 
 	@Before
-	public void setUp() throws Exception {
+	public void setup() {
 		this.nativeCache = new ConcurrentHashMap<>();
 		this.cache = new ConcurrentMapCache(CACHE_NAME, this.nativeCache, true);
 		this.nativeCacheNoNull = new ConcurrentHashMap<>();
-		this.cacheNoNull = new ConcurrentMapCache(CACHE_NAME_NO_NULL,
-				this.nativeCacheNoNull, false);
+		this.cacheNoNull = new ConcurrentMapCache(CACHE_NAME_NO_NULL, this.nativeCacheNoNull, false);
 		this.cache.clear();
 	}
 
@@ -72,6 +70,7 @@ public class ConcurrentMapCacheTests
 		return this.nativeCache;
 	}
 
+
 	@Test
 	public void testIsStoreByReferenceByDefault() {
 		assertFalse(this.cache.isStoreByValue());

spring-context/src/test/java/org/springframework/context/annotation/ClassPathBeanDefinitionScannerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -28,16 +28,18 @@ import org.springframework.beans.BeanInstantiationException;
 import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.beans.factory.support.StaticListableBeanFactory;
 import org.springframework.context.MessageSource;
 import org.springframework.context.annotation2.NamedStubDao2;
+import org.springframework.context.index.CandidateComponentsTestClassLoader;
 import org.springframework.context.support.GenericApplicationContext;
+import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.type.filter.AnnotationTypeFilter;
 import org.springframework.core.type.filter.AssignableTypeFilter;
 import org.springframework.stereotype.Component;
-import org.springframework.tests.sample.beans.TestBean;
 
 import static org.junit.Assert.*;
 
@@ -102,10 +104,66 @@ public class ClassPathBeanDefinitionScannerTests {
 	@Test
 	public void testDoubleScan() {
 		GenericApplicationContext context = new GenericApplicationContext();
+
 		ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(context);
 		int beanCount = scanner.scan(BASE_PACKAGE);
 		assertEquals(12, beanCount);
-		scanner.scan(BASE_PACKAGE);
+
+		ClassPathBeanDefinitionScanner scanner2 = new ClassPathBeanDefinitionScanner(context) {
+			@Override
+			protected void postProcessBeanDefinition(AbstractBeanDefinition beanDefinition, String beanName) {
+				super.postProcessBeanDefinition(beanDefinition, beanName);
+				beanDefinition.setAttribute("someDifference", "someValue");
+			}
+		};
+		scanner2.scan(BASE_PACKAGE);
+
+		assertTrue(context.containsBean("serviceInvocationCounter"));
+		assertTrue(context.containsBean("fooServiceImpl"));
+		assertTrue(context.containsBean("stubFooDao"));
+		assertTrue(context.containsBean("myNamedComponent"));
+		assertTrue(context.containsBean("myNamedDao"));
+		assertTrue(context.containsBean("thoreau"));
+	}
+
+	@Test
+	public void testWithIndex() {
+		GenericApplicationContext context = new GenericApplicationContext();
+		context.setClassLoader(CandidateComponentsTestClassLoader.index(
+				ClassPathScanningCandidateComponentProviderTests.class.getClassLoader(),
+				new ClassPathResource("spring.components", FooServiceImpl.class)));
+
+		ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(context);
+		int beanCount = scanner.scan(BASE_PACKAGE);
+		assertEquals(12, beanCount);
+
+		assertTrue(context.containsBean("serviceInvocationCounter"));
+		assertTrue(context.containsBean("fooServiceImpl"));
+		assertTrue(context.containsBean("stubFooDao"));
+		assertTrue(context.containsBean("myNamedComponent"));
+		assertTrue(context.containsBean("myNamedDao"));
+		assertTrue(context.containsBean("thoreau"));
+	}
+
+	@Test
+	public void testDoubleScanWithIndex() {
+		GenericApplicationContext context = new GenericApplicationContext();
+		context.setClassLoader(CandidateComponentsTestClassLoader.index(
+				ClassPathScanningCandidateComponentProviderTests.class.getClassLoader(),
+				new ClassPathResource("spring.components", FooServiceImpl.class)));
+
+		ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(context);
+		int beanCount = scanner.scan(BASE_PACKAGE);
+		assertEquals(12, beanCount);
+
+		ClassPathBeanDefinitionScanner scanner2 = new ClassPathBeanDefinitionScanner(context) {
+			@Override
+			protected void postProcessBeanDefinition(AbstractBeanDefinition beanDefinition, String beanName) {
+				super.postProcessBeanDefinition(beanDefinition, beanName);
+				beanDefinition.setAttribute("someDifference", "someValue");
+			}
+		};
+		scanner2.scan(BASE_PACKAGE);
 
 		assertTrue(context.containsBean("serviceInvocationCounter"));
 		assertTrue(context.containsBean("fooServiceImpl"));

spring-context/src/test/java/org/springframework/context/annotation/ClassPathScanningCandidateComponentProviderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -40,8 +40,8 @@ import example.scannable.sub.BarComponent;
 import org.aspectj.lang.annotation.Aspect;
 import org.junit.Test;
 
-import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
 import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.context.annotation.componentscan.gh24375.MyComponent;
 import org.springframework.context.index.CandidateComponentsTestClassLoader;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.StandardEnvironment;
@@ -80,18 +80,17 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
 		provider.setResourceLoader(new DefaultResourceLoader(
 				CandidateComponentsTestClassLoader.disableIndex(getClass().getClassLoader())));
-		testDefault(provider, ScannedGenericBeanDefinition.class);
+		testDefault(provider);
 	}
 
 	@Test
 	public void defaultsWithIndex() {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
 		provider.setResourceLoader(new DefaultResourceLoader(TEST_BASE_CLASSLOADER));
-		testDefault(provider, AnnotatedGenericBeanDefinition.class);
+		testDefault(provider);
 	}
 
-	private void testDefault(ClassPathScanningCandidateComponentProvider provider,
-			Class<? extends BeanDefinition> expectedBeanDefinitionType) {
+	private void testDefault(ClassPathScanningCandidateComponentProvider provider) {
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE);
 		assertTrue(containsBeanClass(candidates, DefaultNamedComponent.class));
 		assertTrue(containsBeanClass(candidates, NamedComponent.class));
@@ -101,7 +100,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		assertTrue(containsBeanClass(candidates, ServiceInvocationCounter.class));
 		assertTrue(containsBeanClass(candidates, BarComponent.class));
 		assertEquals(7, candidates.size());
-		assertBeanDefinitionType(candidates, expectedBeanDefinitionType);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -109,22 +108,21 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
 		provider.setResourceLoader(new DefaultResourceLoader(
 				CandidateComponentsTestClassLoader.disableIndex(getClass().getClassLoader())));
-		testAntStyle(provider, ScannedGenericBeanDefinition.class);
+		testAntStyle(provider);
 	}
 
 	@Test
 	public void antStylePackageWithIndex() {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
 		provider.setResourceLoader(new DefaultResourceLoader(TEST_BASE_CLASSLOADER));
-		testAntStyle(provider, AnnotatedGenericBeanDefinition.class);
+		testAntStyle(provider);
 	}
 
-	private void testAntStyle(ClassPathScanningCandidateComponentProvider provider,
-			Class<? extends BeanDefinition> expectedBeanDefinitionType) {
+	private void testAntStyle(ClassPathScanningCandidateComponentProvider provider) {
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE + ".**.sub");
 		assertTrue(containsBeanClass(candidates, BarComponent.class));
 		assertEquals(1, candidates.size());
-		assertBeanDefinitionType(candidates, expectedBeanDefinitionType);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -151,7 +149,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		provider.addIncludeFilter(new AnnotationTypeFilter(Component.class));
 		provider.resetFilters(true);
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE);
-		assertBeanDefinitionType(candidates, AnnotatedGenericBeanDefinition.class);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -159,20 +157,19 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
 		provider.setResourceLoader(new DefaultResourceLoader(
 				CandidateComponentsTestClassLoader.disableIndex(getClass().getClassLoader())));
-		testCustomAnnotationTypeIncludeFilter(provider, ScannedGenericBeanDefinition.class);
+		testCustomAnnotationTypeIncludeFilter(provider);
 	}
 
 	@Test
 	public void customAnnotationTypeIncludeFilterWithIndex() {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
 		provider.setResourceLoader(new DefaultResourceLoader(TEST_BASE_CLASSLOADER));
-		testCustomAnnotationTypeIncludeFilter(provider, AnnotatedGenericBeanDefinition.class);
+		testCustomAnnotationTypeIncludeFilter(provider);
 	}
 
-	private void testCustomAnnotationTypeIncludeFilter(ClassPathScanningCandidateComponentProvider provider,
-			Class<? extends BeanDefinition> expectedBeanDefinitionType) {
+	private void testCustomAnnotationTypeIncludeFilter(ClassPathScanningCandidateComponentProvider provider) {
 		provider.addIncludeFilter(new AnnotationTypeFilter(Component.class));
-		testDefault(provider, expectedBeanDefinitionType);
+		testDefault(provider);
 	}
 
 	@Test
@@ -180,18 +177,17 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
 		provider.setResourceLoader(new DefaultResourceLoader(
 				CandidateComponentsTestClassLoader.disableIndex(getClass().getClassLoader())));
-		testCustomAssignableTypeIncludeFilter(provider, ScannedGenericBeanDefinition.class);
+		testCustomAssignableTypeIncludeFilter(provider);
 	}
 
 	@Test
 	public void customAssignableTypeIncludeFilterWithIndex() {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
 		provider.setResourceLoader(new DefaultResourceLoader(TEST_BASE_CLASSLOADER));
-		testCustomAssignableTypeIncludeFilter(provider, AnnotatedGenericBeanDefinition.class);
+		testCustomAssignableTypeIncludeFilter(provider);
 	}
 
-	private void testCustomAssignableTypeIncludeFilter(ClassPathScanningCandidateComponentProvider provider,
-			Class<? extends BeanDefinition> expectedBeanDefinitionType) {
+	private void testCustomAssignableTypeIncludeFilter(ClassPathScanningCandidateComponentProvider provider) {
 		provider.addIncludeFilter(new AssignableTypeFilter(FooService.class));
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE);
 		// Interfaces/Abstract class are filtered out automatically.
@@ -199,7 +195,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		assertTrue(containsBeanClass(candidates, FooServiceImpl.class));
 		assertTrue(containsBeanClass(candidates, ScopedProxyTestBean.class));
 		assertEquals(3, candidates.size());
-		assertBeanDefinitionType(candidates, expectedBeanDefinitionType);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -207,18 +203,17 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
 		provider.setResourceLoader(new DefaultResourceLoader(
 				CandidateComponentsTestClassLoader.disableIndex(getClass().getClassLoader())));
-		testCustomSupportedIncludeAndExcludeFilter(provider, ScannedGenericBeanDefinition.class);
+		testCustomSupportedIncludeAndExcludeFilter(provider);
 	}
 
 	@Test
 	public void customSupportedIncludeAndExcludeFilterWithIndex() {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
 		provider.setResourceLoader(new DefaultResourceLoader(TEST_BASE_CLASSLOADER));
-		testCustomSupportedIncludeAndExcludeFilter(provider, AnnotatedGenericBeanDefinition.class);
+		testCustomSupportedIncludeAndExcludeFilter(provider);
 	}
 
-	private void testCustomSupportedIncludeAndExcludeFilter(ClassPathScanningCandidateComponentProvider provider,
-			Class<? extends BeanDefinition> expectedBeanDefinitionType) {
+	private void testCustomSupportedIncludeAndExcludeFilter(ClassPathScanningCandidateComponentProvider provider) {
 		provider.addIncludeFilter(new AnnotationTypeFilter(Component.class));
 		provider.addExcludeFilter(new AnnotationTypeFilter(Service.class));
 		provider.addExcludeFilter(new AnnotationTypeFilter(Repository.class));
@@ -227,7 +222,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		assertTrue(containsBeanClass(candidates, ServiceInvocationCounter.class));
 		assertTrue(containsBeanClass(candidates, BarComponent.class));
 		assertEquals(3, candidates.size());
-		assertBeanDefinitionType(candidates, expectedBeanDefinitionType);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -240,7 +235,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE);
 		assertTrue(containsBeanClass(candidates, DefaultNamedComponent.class));
 		assertEquals(1, candidates.size());
-		assertBeanDefinitionType(candidates, ScannedGenericBeanDefinition.class);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -251,7 +246,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE);
 		assertTrue(containsBeanClass(candidates, StubFooDao.class));
 		assertEquals(1, candidates.size());
-		assertBeanDefinitionType(candidates, ScannedGenericBeanDefinition.class);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -260,7 +255,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		provider.setResourceLoader(new DefaultResourceLoader(
 				CandidateComponentsTestClassLoader.disableIndex(getClass().getClassLoader())));
 		provider.addExcludeFilter(new RegexPatternTypeFilter(Pattern.compile(TEST_BASE_PACKAGE + ".*Named.*")));
-		testExclude(provider, ScannedGenericBeanDefinition.class);
+		testExclude(provider);
 	}
 
 	@Test
@@ -268,18 +263,17 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
 		provider.setResourceLoader(new DefaultResourceLoader(TEST_BASE_CLASSLOADER));
 		provider.addExcludeFilter(new RegexPatternTypeFilter(Pattern.compile(TEST_BASE_PACKAGE + ".*Named.*")));
-		testExclude(provider, AnnotatedGenericBeanDefinition.class);
+		testExclude(provider);
 	}
 
-	private void testExclude(ClassPathScanningCandidateComponentProvider provider,
-			Class<? extends BeanDefinition> expectedBeanDefinitionType) {
+	private void testExclude(ClassPathScanningCandidateComponentProvider provider) {
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE);
 		assertTrue(containsBeanClass(candidates, FooServiceImpl.class));
 		assertTrue(containsBeanClass(candidates, StubFooDao.class));
 		assertTrue(containsBeanClass(candidates, ServiceInvocationCounter.class));
 		assertTrue(containsBeanClass(candidates, BarComponent.class));
 		assertEquals(4, candidates.size());
-		assertBeanDefinitionType(candidates, expectedBeanDefinitionType);
+		assertBeanDefinitionType(candidates);
 	}
 
 	@Test
@@ -307,7 +301,7 @@ public class ClassPathScanningCandidateComponentProviderTests {
 	}
 
 	@Test
-	public void testWithAspectAnnotationOnly() throws Exception {
+	public void testWithAspectAnnotationOnly() {
 		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);
 		provider.addIncludeFilter(new AnnotationTypeFilter(Aspect.class));
 		Set<BeanDefinition> candidates = provider.findCandidateComponents(TEST_BASE_PACKAGE);
@@ -501,6 +495,15 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		}
 	}
 
+	@Test
+	public void gh24375() {
+		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
+		Set<BeanDefinition> components = provider.findCandidateComponents(MyComponent.class.getPackage().getName());
+		assertEquals(1, components.size());
+		assertEquals(MyComponent.class.getName(), components.iterator().next().getBeanClassName());
+	}
+
+
 	private boolean containsBeanClass(Set<BeanDefinition> candidates, Class<?> beanClass) {
 		for (BeanDefinition candidate : candidates) {
 			if (beanClass.getName().equals(candidate.getBeanClassName())) {
@@ -510,10 +513,9 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		return false;
 	}
 
-	private void assertBeanDefinitionType(Set<BeanDefinition> candidates,
-			Class<? extends BeanDefinition> expectedType) {
+	private void assertBeanDefinitionType(Set<BeanDefinition> candidates) {
 		candidates.forEach(c -> {
-			assertThat(c, is(instanceOf(expectedType)));
+			assertThat(c, is(instanceOf(ScannedGenericBeanDefinition.class)));
 		});
 	}
 

spring-context/src/test/java/org/springframework/context/annotation/ImportSelectorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -530,9 +530,10 @@ public class ImportSelectorTests {
 		static Map<String, List<String>> allImports() {
 			return TestImportGroup.imports.entrySet()
 					.stream()
-					.collect(Collectors.toMap((entry) -> entry.getKey().getClassName(),
+					.collect(Collectors.toMap(entry -> entry.getKey().getClassName(),
 							Map.Entry::getValue));
 		}
+
 		private final List<Entry> instanceImports = new ArrayList<>();
 
 		@Override

spring-context/src/test/java/org/springframework/context/annotation/componentscan/gh24375/A.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2002-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.context.annotation.componentscan.gh24375;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.core.annotation.AliasFor;
+
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface A {
+
+	@AliasFor("value")
+	B other() default @B;
+
+	@AliasFor("other")
+	B value() default @B;
+}

spring-context/src/test/java/org/springframework/context/annotation/componentscan/gh24375/B.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2002-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.context.annotation.componentscan.gh24375;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.ANNOTATION_TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface B {
+
+	String name() default "";
+}

spring-context/src/test/java/org/springframework/context/annotation/componentscan/gh24375/MyComponent.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2002-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.context.annotation.componentscan.gh24375;
+
+import org.springframework.stereotype.Component;
+
+@Component
+@A(other = @B)
+public class MyComponent {
+}

spring-context/src/test/java/org/springframework/context/index/CandidateComponentsIndexLoaderTests.java

@@ -92,7 +92,7 @@ public class CandidateComponentsIndexLoaderTests {
 	}
 
 	@Test
-	public void loadIndexNoEntry() throws IOException {
+	public void loadIndexNoEntry() {
 		CandidateComponentsIndex index = CandidateComponentsIndexLoader.loadIndex(
 				CandidateComponentsTestClassLoader.index(getClass().getClassLoader(),
 						new ClassPathResource("empty-spring.components", getClass())));
@@ -100,7 +100,7 @@ public class CandidateComponentsIndexLoaderTests {
 	}
 
 	@Test
-	public void loadIndexWithException() throws IOException {
+	public void loadIndexWithException() {
 		final IOException cause = new IOException("test exception");
 		this.thrown.expect(IllegalStateException.class);
 		this.thrown.expectMessage("Unable to load indexes");

spring-core/src/main/java/org/springframework/cglib/core/ReflectUtils.java

@@ -336,7 +336,15 @@ public class ReflectUtils {
 	public static Constructor getConstructor(Class type, Class[] parameterTypes) {
 		try {
 			Constructor constructor = type.getDeclaredConstructor(parameterTypes);
-			constructor.setAccessible(true);
+			if (System.getSecurityManager() != null) {
+				AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
+					constructor.setAccessible(true);
+					return null;
+				});
+			}
+			else {
+				constructor.setAccessible(true);
+			}
 			return constructor;
 		}
 		catch (NoSuchMethodException e) {

spring-core/src/main/java/org/springframework/cglib/proxy/Enhancer.java

@@ -259,6 +259,9 @@ public class Enhancer extends AbstractClassGenerator {
 	public void setSuperclass(Class superclass) {
 		if (superclass != null && superclass.isInterface()) {
 			setInterfaces(new Class[]{superclass});
+			// SPRING PATCH BEGIN
+			setContextClass(superclass);
+			// SPRING PATCH END
 		}
 		else if (superclass != null && superclass.equals(Object.class)) {
 			// affects choice of ClassLoader

spring-core/src/main/java/org/springframework/core/GenericTypeResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -169,11 +169,12 @@ public final class GenericTypeResolver {
 					ParameterizedType parameterizedType = (ParameterizedType) genericType;
 					Class<?>[] generics = new Class<?>[parameterizedType.getActualTypeArguments().length];
 					Type[] typeArguments = parameterizedType.getActualTypeArguments();
+					ResolvableType contextType = ResolvableType.forClass(contextClass);
 					for (int i = 0; i < typeArguments.length; i++) {
 						Type typeArgument = typeArguments[i];
 						if (typeArgument instanceof TypeVariable) {
 							ResolvableType resolvedTypeArgument = resolveVariable(
-									(TypeVariable<?>) typeArgument, ResolvableType.forClass(contextClass));
+									(TypeVariable<?>) typeArgument, contextType);
 							if (resolvedTypeArgument != ResolvableType.NONE) {
 								generics[i] = resolvedTypeArgument.resolve();
 							}

spring-core/src/main/java/org/springframework/core/KotlinDetector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -18,9 +18,6 @@ package org.springframework.core;
 
 import java.lang.annotation.Annotation;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 
@@ -34,8 +31,6 @@ import org.springframework.util.ClassUtils;
 @SuppressWarnings("unchecked")
 public abstract class KotlinDetector {
 
-	private static final Log logger = LogFactory.getLog(KotlinDetector.class);
-
 	@Nullable
 	private static final Class<? extends Annotation> kotlinMetadata;
 
@@ -53,9 +48,6 @@ public abstract class KotlinDetector {
 		}
 		kotlinMetadata = (Class<? extends Annotation>) metadata;
 		kotlinReflectPresent = ClassUtils.isPresent("kotlin.reflect.full.KClasses", classLoader);
-		if (kotlinMetadata != null && !kotlinReflectPresent) {
-			logger.info("Kotlin reflection implementation not found at runtime, related features won't be available.");
-		}
 	}
 
 

spring-core/src/main/java/org/springframework/core/env/AbstractPropertyResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -16,6 +16,7 @@
 
 package org.springframework.core.env;
 
+import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Set;
 
@@ -136,9 +137,7 @@ public abstract class AbstractPropertyResolver implements ConfigurablePropertyRe
 
 	@Override
 	public void setRequiredProperties(String... requiredProperties) {
-		for (String key : requiredProperties) {
-			this.requiredProperties.add(key);
-		}
+		Collections.addAll(this.requiredProperties, requiredProperties);
 	}
 
 	@Override
@@ -224,6 +223,9 @@ public abstract class AbstractPropertyResolver implements ConfigurablePropertyRe
 	 * @see #setIgnoreUnresolvableNestedPlaceholders
 	 */
 	protected String resolveNestedPlaceholders(String value) {
+		if (value.isEmpty()) {
+			return value;
+		}
 		return (this.ignoreUnresolvableNestedPlaceholders ?
 				resolvePlaceholders(value) : resolveRequiredPlaceholders(value));
 	}

spring-core/src/main/java/org/springframework/core/env/EnumerablePropertySource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -44,10 +44,20 @@ import org.springframework.util.ObjectUtils;
  */
 public abstract class EnumerablePropertySource<T> extends PropertySource<T> {
 
+	/**
+	 * Create a new {@code EnumerablePropertySource} with the given name and source object.
+	 * @param name the associated name
+	 * @param source the source object
+	 */
 	public EnumerablePropertySource(String name, T source) {
 		super(name, source);
 	}
 
+	/**
+	 * Create a new {@code EnumerablePropertySource} with the given name and with a new
+	 * {@code Object} instance as the underlying source.
+	 * @param name the associated name
+	 */
 	protected EnumerablePropertySource(String name) {
 		super(name);
 	}

spring-core/src/main/java/org/springframework/core/env/MapPropertySource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2020 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.springframework.util.StringUtils;
 
 /**
  * {@link PropertySource} that reads keys and values from a {@code Map} object.
+ * The underlying map should not contain any {@code null} values in order to
+ * comply with {@link #getProperty} and {@link #containsProperty} semantics.
  *
  * @author Chris Beams
  * @author Juergen Hoeller
@@ -31,6 +33,12 @@ import org.springframework.util.StringUtils;
  */
 public class MapPropertySource extends EnumerablePropertySource<Map<String, Object>> {
 
+	/**
+	 * Create a new {@code MapPropertySource} with the given name and {@code Map}.
+	 * @param name the associated name
+	 * @param source the Map source (without {@code null} values in order to get
+	 * consistent {@link #getProperty} and {@link #containsProperty} behavior)
+	 */
 	public MapPropertySource(String name, Map<String, Object> source) {
 		super(name, source);
 	}

spring-core/src/main/java/org/springframework/core/env/MutablePropertySources.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -79,14 +79,23 @@ public class MutablePropertySources implements PropertySources {
 
 	@Override
 	public boolean contains(String name) {
-		return this.propertySourceList.contains(PropertySource.named(name));
+		for (PropertySource<?> propertySource : this.propertySourceList) {
+			if (propertySource.getName().equals(name)) {
+				return true;
+			}
+		}
+		return false;
 	}
 
 	@Override
 	@Nullable
 	public PropertySource<?> get(String name) {
-		int index = this.propertySourceList.indexOf(PropertySource.named(name));
-		return (index != -1 ? this.propertySourceList.get(index) : null);
+		for (PropertySource<?> propertySource : this.propertySourceList) {
+			if (propertySource.getName().equals(name)) {
+				return propertySource;
+			}
+		}
+		return null;
 	}
 
 
@@ -94,16 +103,20 @@ public class MutablePropertySources implements PropertySources {
 	 * Add the given property source object with highest precedence.
 	 */
 	public void addFirst(PropertySource<?> propertySource) {
-		removeIfPresent(propertySource);
-		this.propertySourceList.add(0, propertySource);
+		synchronized (this.propertySourceList) {
+			removeIfPresent(propertySource);
+			this.propertySourceList.add(0, propertySource);
+		}
 	}
 
 	/**
 	 * Add the given property source object with lowest precedence.
 	 */
 	public void addLast(PropertySource<?> propertySource) {
-		removeIfPresent(propertySource);
-		this.propertySourceList.add(propertySource);
+		synchronized (this.propertySourceList) {
+			removeIfPresent(propertySource);
+			this.propertySourceList.add(propertySource);
+		}
 	}
 
 	/**
@@ -112,9 +125,11 @@ public class MutablePropertySources implements PropertySources {
 	 */
 	public void addBefore(String relativePropertySourceName, PropertySource<?> propertySource) {
 		assertLegalRelativeAddition(relativePropertySourceName, propertySource);
-		removeIfPresent(propertySource);
-		int index = assertPresentAndGetIndex(relativePropertySourceName);
-		addAtIndex(index, propertySource);
+		synchronized (this.propertySourceList) {
+			removeIfPresent(propertySource);
+			int index = assertPresentAndGetIndex(relativePropertySourceName);
+			addAtIndex(index, propertySource);
+		}
 	}
 
 	/**
@@ -123,9 +138,11 @@ public class MutablePropertySources implements PropertySources {
 	 */
 	public void addAfter(String relativePropertySourceName, PropertySource<?> propertySource) {
 		assertLegalRelativeAddition(relativePropertySourceName, propertySource);
-		removeIfPresent(propertySource);
-		int index = assertPresentAndGetIndex(relativePropertySourceName);
-		addAtIndex(index + 1, propertySource);
+		synchronized (this.propertySourceList) {
+			removeIfPresent(propertySource);
+			int index = assertPresentAndGetIndex(relativePropertySourceName);
+			addAtIndex(index + 1, propertySource);
+		}
 	}
 
 	/**
@@ -141,8 +158,10 @@ public class MutablePropertySources implements PropertySources {
 	 */
 	@Nullable
 	public PropertySource<?> remove(String name) {
-		int index = this.propertySourceList.indexOf(PropertySource.named(name));
-		return (index != -1 ? this.propertySourceList.remove(index) : null);
+		synchronized (this.propertySourceList) {
+			int index = this.propertySourceList.indexOf(PropertySource.named(name));
+			return (index != -1 ? this.propertySourceList.remove(index) : null);
+		}
 	}
 
 	/**
@@ -153,8 +172,10 @@ public class MutablePropertySources implements PropertySources {
 	 * @see #contains
 	 */
 	public void replace(String name, PropertySource<?> propertySource) {
-		int index = assertPresentAndGetIndex(name);
-		this.propertySourceList.set(index, propertySource);
+		synchronized (this.propertySourceList) {
+			int index = assertPresentAndGetIndex(name);
+			this.propertySourceList.set(index, propertySource);
+		}
 	}
 
 	/**
@@ -169,6 +190,7 @@ public class MutablePropertySources implements PropertySources {
 		return this.propertySourceList.toString();
 	}
 
+
 	/**
 	 * Ensure that the given property source is not being added relative to itself.
 	 */

spring-core/src/main/java/org/springframework/core/env/Profiles.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.function.Predicate;
  * {@link #of(String...) of(...)} factory method.
  *
  * @author Phillip Webb
+ * @author Sam Brannen
  * @since 5.1
  */
 @FunctionalInterface
@@ -34,7 +35,7 @@ public interface Profiles {
 	/**
 	 * Test if this {@code Profiles} instance <em>matches</em> against the given
 	 * active profiles predicate.
-	 * @param activeProfiles predicate that tests whether a given profile is
+	 * @param activeProfiles a predicate that tests whether a given profile is
 	 * currently active
 	 */
 	boolean matches(Predicate<String> activeProfiles);
@@ -49,16 +50,20 @@ public interface Profiles {
 	 * {@code "production"}) or a profile expression. A profile expression allows
 	 * for more complicated profile logic to be expressed, for example
 	 * {@code "production & cloud"}.
-	 * <p>The following operators are supported in profile expressions:
+	 * <p>The following operators are supported in profile expressions.
 	 * <ul>
-	 * <li>{@code !} - A logical <em>not</em> of the profile</li>
-	 * <li>{@code &} - A logical <em>and</em> of the profiles</li>
-	 * <li>{@code |} - A logical <em>or</em> of the profiles</li>
+	 * <li>{@code !} - A logical <em>NOT</em> of the profile or profile expression</li>
+	 * <li>{@code &} - A logical <em>AND</em> of the profiles or profile expressions</li>
+	 * <li>{@code |} - A logical <em>OR</em> of the profiles or profile expressions</li>
 	 * </ul>
 	 * <p>Please note that the {@code &} and {@code |} operators may not be mixed
 	 * without using parentheses. For example {@code "a & b | c"} is not a valid
 	 * expression; it must be expressed as {@code "(a & b) | c"} or
 	 * {@code "a & (b | c)"}.
+	 * <p>As of Spring Framework 5.1.17, two {@code Profiles} instances returned
+	 * by this method are considered equivalent to each other (in terms of
+	 * {@code equals()} and {@code hashCode()} semantics) if they are created
+	 * with identical <em>profile strings</em>.
 	 * @param profiles the <em>profile strings</em> to include
 	 * @return a new {@link Profiles} instance
 	 */

spring-core/src/main/java/org/springframework/core/env/ProfilesParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -18,7 +18,10 @@ package org.springframework.core.env;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 import java.util.StringTokenizer;
 import java.util.function.Predicate;
 
@@ -30,6 +33,7 @@ import org.springframework.util.StringUtils;
  * Internal parser used by {@link Profiles#of}.
  *
  * @author Phillip Webb
+ * @author Sam Brannen
  * @since 5.1
  */
 final class ProfilesParser {
@@ -56,6 +60,7 @@ final class ProfilesParser {
 	private static Profiles parseTokens(String expression, StringTokenizer tokens) {
 		return parseTokens(expression, tokens, Context.NONE);
 	}
+
 	private static Profiles parseTokens(String expression, StringTokenizer tokens, Context context) {
 		List<Profiles> elements = new ArrayList<>();
 		Operator operator = null;
@@ -145,12 +150,12 @@ final class ProfilesParser {
 
 	private static class ParsedProfiles implements Profiles {
 
-		private final String[] expressions;
+		private final Set<String> expressions = new LinkedHashSet<>();
 
 		private final Profiles[] parsed;
 
 		ParsedProfiles(String[] expressions, Profiles[] parsed) {
-			this.expressions = expressions;
+			Collections.addAll(this.expressions, expressions);
 			this.parsed = parsed;
 		}
 
@@ -165,9 +170,30 @@ final class ProfilesParser {
 		}
 
 		@Override
-		public String toString() {
-			return StringUtils.arrayToDelimitedString(this.expressions, " or ");
+		public int hashCode() {
+			return this.expressions.hashCode();
 		}
+
+		@Override
+		public boolean equals(Object obj) {
+			if (this == obj) {
+				return true;
+			}
+			if (obj == null) {
+				return false;
+			}
+			if (getClass() != obj.getClass()) {
+				return false;
+			}
+			ParsedProfiles that = (ParsedProfiles) obj;
+			return this.expressions.equals(that.expressions);
+		}
+
+		@Override
+		public String toString() {
+			return StringUtils.collectionToDelimitedString(this.expressions, " or ");
+		}
+
 	}
 
 }

spring-core/src/main/java/org/springframework/core/env/PropertyResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -98,7 +98,6 @@ public interface PropertyResolver {
 	 * @return the resolved String (never {@code null})
 	 * @throws IllegalArgumentException if given text is {@code null}
 	 * @see #resolveRequiredPlaceholders
-	 * @see org.springframework.util.SystemPropertyUtils#resolvePlaceholders(String)
 	 */
 	String resolvePlaceholders(String text);
 
@@ -109,7 +108,6 @@ public interface PropertyResolver {
 	 * @return the resolved String (never {@code null})
 	 * @throws IllegalArgumentException if given text is {@code null}
 	 * or if any placeholders are unresolvable
-	 * @see org.springframework.util.SystemPropertyUtils#resolvePlaceholders(String, boolean)
 	 */
 	String resolveRequiredPlaceholders(String text) throws IllegalArgumentException;
 

spring-core/src/main/java/org/springframework/core/env/PropertySource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -68,6 +68,8 @@ public abstract class PropertySource<T> {
 
 	/**
 	 * Create a new {@code PropertySource} with the given name and source object.
+	 * @param name the associated name
+	 * @param source the source object
 	 */
 	public PropertySource(String name, T source) {
 		Assert.hasText(name, "Property source name must contain at least one character");
@@ -134,7 +136,7 @@ public abstract class PropertySource<T> {
 	@Override
 	public boolean equals(Object other) {
 		return (this == other || (other instanceof PropertySource &&
-				ObjectUtils.nullSafeEquals(this.name, ((PropertySource<?>) other).name)));
+				ObjectUtils.nullSafeEquals(getName(), ((PropertySource<?>) other).getName())));
 	}
 
 	/**
@@ -143,7 +145,7 @@ public abstract class PropertySource<T> {
 	 */
 	@Override
 	public int hashCode() {
-		return ObjectUtils.nullSafeHashCode(this.name);
+		return ObjectUtils.nullSafeHashCode(getName());
 	}
 
 	/**
@@ -159,10 +161,10 @@ public abstract class PropertySource<T> {
 	public String toString() {
 		if (logger.isDebugEnabled()) {
 			return getClass().getSimpleName() + "@" + System.identityHashCode(this) +
-					" {name='" + this.name + "', properties=" + this.source + "}";
+					" {name='" + getName() + "', properties=" + getSource() + "}";
 		}
 		else {
-			return getClass().getSimpleName() + " {name='" + this.name + "'}";
+			return getClass().getSimpleName() + " {name='" + getName() + "'}";
 		}
 	}
 

spring-core/src/main/java/org/springframework/core/io/support/PropertySourceFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2020 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 +33,8 @@ public interface PropertySourceFactory {
 	/**
 	 * Create a {@link PropertySource} that wraps the given resource.
 	 * @param name the name of the property source
+	 * (can be {@code null} in which case the factory implementation
+	 * will have to generate a name based on the given resource)
 	 * @param resource the resource (potentially encoded) to wrap
 	 * @return the new {@link PropertySource} (never {@code null})
 	 * @throws IOException if resource resolution failed

spring-core/src/main/java/org/springframework/core/task/SimpleAsyncTaskExecutor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -126,6 +126,11 @@ public class SimpleAsyncTaskExecutor extends CustomizableThreadCreator
 	 * execution callback (which may be a wrapper around the user-supplied task).
 	 * <p>The primary use case is to set some execution context around the task's
 	 * invocation, or to provide some monitoring/statistics for task execution.
+	 * <p><b>NOTE:</b> Exception handling in {@code TaskDecorator} implementations
+	 * is limited to plain {@code Runnable} execution via {@code execute} calls.
+	 * In case of {@code #submit} calls, the exposed {@code Runnable} will be a
+	 * {@code FutureTask} which does not propagate any exceptions; you might
+	 * have to cast it and call {@code Future#get} to evaluate exceptions.
 	 * @since 4.3
 	 */
 	public final void setTaskDecorator(TaskDecorator taskDecorator) {

spring-core/src/main/java/org/springframework/core/task/TaskDecorator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -27,17 +27,24 @@ package org.springframework.core.task;
  * <p>The primary use case is to set some execution context around the task's
  * invocation, or to provide some monitoring/statistics for task execution.
  *
+ * <p><b>NOTE:</b> Exception handling in {@code TaskDecorator} implementations
+ * may be limited. Specifically in case of a {@code Future}-based operation,
+ * the exposed {@code Runnable} will be a wrapper which does not propagate
+ * any exceptions from its {@code run} method.
+ *
  * @author Juergen Hoeller
  * @since 4.3
  * @see TaskExecutor#execute(Runnable)
  * @see SimpleAsyncTaskExecutor#setTaskDecorator
+ * @see org.springframework.core.task.support.TaskExecutorAdapter#setTaskDecorator
  */
 @FunctionalInterface
 public interface TaskDecorator {
 
 	/**
 	 * Decorate the given {@code Runnable}, returning a potentially wrapped
-	 * {@code Runnable} for actual execution.
+	 * {@code Runnable} for actual execution, internally delegating to the
+	 * original {@link Runnable#run()} implementation.
 	 * @param runnable the original {@code Runnable}
 	 * @return the decorated {@code Runnable}
 	 */

spring-core/src/main/java/org/springframework/core/task/support/TaskExecutorAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -70,6 +70,11 @@ public class TaskExecutorAdapter implements AsyncListenableTaskExecutor {
 	 * execution callback (which may be a wrapper around the user-supplied task).
 	 * <p>The primary use case is to set some execution context around the task's
 	 * invocation, or to provide some monitoring/statistics for task execution.
+	 * <p><b>NOTE:</b> Exception handling in {@code TaskDecorator} implementations
+	 * is limited to plain {@code Runnable} execution via {@code execute} calls.
+	 * In case of {@code #submit} calls, the exposed {@code Runnable} will be a
+	 * {@code FutureTask} which does not propagate any exceptions; you might
+	 * have to cast it and call {@code Future#get} to evaluate exceptions.
 	 * @since 4.3
 	 */
 	public final void setTaskDecorator(TaskDecorator taskDecorator) {

spring-core/src/main/java/org/springframework/core/type/classreading/MethodMetadataReadingVisitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -149,9 +149,10 @@ public class MethodMetadataReadingVisitor extends MethodVisitor implements Metho
 		MultiValueMap<String, Object> allAttributes = new LinkedMultiValueMap<>();
 		List<AnnotationAttributes> attributesList = this.attributesMap.get(annotationName);
 		if (attributesList != null) {
+			String annotatedElement = "method '" + getMethodName() + '\'';
 			for (AnnotationAttributes annotationAttributes : attributesList) {
 				AnnotationAttributes convertedAttributes = AnnotationReadingVisitorUtils.convertClassValues(
-						"method '" + getMethodName() + "'", this.classLoader, annotationAttributes, classValuesAsString);
+						annotatedElement, this.classLoader, annotationAttributes, classValuesAsString);
 				convertedAttributes.forEach(allAttributes::add);
 			}
 		}

spring-core/src/main/java/org/springframework/util/ClassUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -137,7 +137,6 @@ public abstract class ClassUtils {
 		primitiveTypes.addAll(primitiveWrapperTypeMap.values());
 		Collections.addAll(primitiveTypes, boolean[].class, byte[].class, char[].class,
 				double[].class, float[].class, int[].class, long[].class, short[].class);
-		primitiveTypes.add(void.class);
 		for (Class<?> primitiveType : primitiveTypes) {
 			primitiveTypeNameMap.put(primitiveType.getName(), primitiveType);
 		}
@@ -532,7 +531,7 @@ public abstract class ClassUtils {
 	 * @param lhsType the target type
 	 * @param rhsType the value type that should be assigned to the target type
 	 * @return if the target type is assignable from the value type
-	 * @see TypeUtils#isAssignable
+	 * @see TypeUtils#isAssignable(java.lang.reflect.Type, java.lang.reflect.Type)
 	 */
 	public static boolean isAssignable(Class<?> lhsType, Class<?> rhsType) {
 		Assert.notNull(lhsType, "Left-hand side type must not be null");
@@ -542,17 +541,12 @@ public abstract class ClassUtils {
 		}
 		if (lhsType.isPrimitive()) {
 			Class<?> resolvedPrimitive = primitiveWrapperTypeMap.get(rhsType);
-			if (lhsType == resolvedPrimitive) {
-				return true;
-			}
+			return (lhsType == resolvedPrimitive);
 		}
 		else {
 			Class<?> resolvedWrapper = primitiveTypeToWrapperMap.get(rhsType);
-			if (resolvedWrapper != null && lhsType.isAssignableFrom(resolvedWrapper)) {
-				return true;
-			}
+			return (resolvedWrapper != null && lhsType.isAssignableFrom(resolvedWrapper));
 		}
-		return false;
 	}
 
 	/**
@@ -1064,7 +1058,7 @@ public abstract class ClassUtils {
 	 * @param clazz the clazz to analyze
 	 * @param paramTypes the parameter types of the method
 	 * @return whether the class has a corresponding constructor
-	 * @see Class#getMethod
+	 * @see Class#getConstructor
 	 */
 	public static boolean hasConstructor(Class<?> clazz, Class<?>... paramTypes) {
 		return (getConstructorIfAvailable(clazz, paramTypes) != null);

spring-core/src/main/java/org/springframework/util/CollectionUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -16,7 +16,6 @@
 
 package org.springframework.util;
 
-import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -24,7 +23,6 @@ import java.util.Collections;
 import java.util.Enumeration;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
@@ -379,25 +377,28 @@ public abstract class CollectionUtils {
 
 	/**
 	 * Adapt a {@code Map<K, List<V>>} to an {@code MultiValueMap<K, V>}.
-	 * @param map the original map
-	 * @return the multi-value map
+	 * @param targetMap the original map
+	 * @return the adapted multi-value map (wrapping the original map)
 	 * @since 3.1
 	 */
-	public static <K, V> MultiValueMap<K, V> toMultiValueMap(Map<K, List<V>> map) {
-		return new MultiValueMapAdapter<>(map);
+	public static <K, V> MultiValueMap<K, V> toMultiValueMap(Map<K, List<V>> targetMap) {
+		Assert.notNull(targetMap, "'targetMap' must not be null");
+		return new MultiValueMapAdapter<>(targetMap);
 	}
 
 	/**
 	 * Return an unmodifiable view of the specified multi-value map.
-	 * @param  map the map for which an unmodifiable view is to be returned.
-	 * @return an unmodifiable view of the specified multi-value map.
+	 * @param targetMap the map for which an unmodifiable view is to be returned.
+	 * @return an unmodifiable view of the specified multi-value map
 	 * @since 3.1
 	 */
 	@SuppressWarnings("unchecked")
-	public static <K, V> MultiValueMap<K, V> unmodifiableMultiValueMap(MultiValueMap<? extends K, ? extends V> map) {
-		Assert.notNull(map, "'map' must not be null");
-		Map<K, List<V>> result = new LinkedHashMap<>(map.size());
-		map.forEach((key, value) -> {
+	public static <K, V> MultiValueMap<K, V> unmodifiableMultiValueMap(
+			MultiValueMap<? extends K, ? extends V> targetMap) {
+
+		Assert.notNull(targetMap, "'targetMap' must not be null");
+		Map<K, List<V>> result = new LinkedHashMap<>(targetMap.size());
+		targetMap.forEach((key, value) -> {
 			List<? extends V> values = Collections.unmodifiableList(value);
 			result.put(key, (List<V>) values);
 		});
@@ -434,141 +435,4 @@ public abstract class CollectionUtils {
 	}
 
 
-	/**
-	 * Adapts a Map to the MultiValueMap contract.
-	 */
-	@SuppressWarnings("serial")
-	private static class MultiValueMapAdapter<K, V> implements MultiValueMap<K, V>, Serializable {
-
-		private final Map<K, List<V>> map;
-
-		public MultiValueMapAdapter(Map<K, List<V>> map) {
-			Assert.notNull(map, "'map' must not be null");
-			this.map = map;
-		}
-
-		@Override
-		@Nullable
-		public V getFirst(K key) {
-			List<V> values = this.map.get(key);
-			return (values != null ? values.get(0) : null);
-		}
-
-		@Override
-		public void add(K key, @Nullable V value) {
-			List<V> values = this.map.computeIfAbsent(key, k -> new LinkedList<>());
-			values.add(value);
-		}
-
-		@Override
-		public void addAll(K key, List<? extends V> values) {
-			List<V> currentValues = this.map.computeIfAbsent(key, k -> new LinkedList<>());
-			currentValues.addAll(values);
-		}
-
-		@Override
-		public void addAll(MultiValueMap<K, V> values) {
-			for (Entry<K, List<V>> entry : values.entrySet()) {
-				addAll(entry.getKey(), entry.getValue());
-			}
-		}
-
-		@Override
-		public void set(K key, @Nullable V value) {
-			List<V> values = new LinkedList<>();
-			values.add(value);
-			this.map.put(key, values);
-		}
-
-		@Override
-		public void setAll(Map<K, V> values) {
-			values.forEach(this::set);
-		}
-
-		@Override
-		public Map<K, V> toSingleValueMap() {
-			LinkedHashMap<K, V> singleValueMap = new LinkedHashMap<>(this.map.size());
-			this.map.forEach((key, value) -> singleValueMap.put(key, value.get(0)));
-			return singleValueMap;
-		}
-
-		@Override
-		public int size() {
-			return this.map.size();
-		}
-
-		@Override
-		public boolean isEmpty() {
-			return this.map.isEmpty();
-		}
-
-		@Override
-		public boolean containsKey(Object key) {
-			return this.map.containsKey(key);
-		}
-
-		@Override
-		public boolean containsValue(Object value) {
-			return this.map.containsValue(value);
-		}
-
-		@Override
-		public List<V> get(Object key) {
-			return this.map.get(key);
-		}
-
-		@Override
-		public List<V> put(K key, List<V> value) {
-			return this.map.put(key, value);
-		}
-
-		@Override
-		public List<V> remove(Object key) {
-			return this.map.remove(key);
-		}
-
-		@Override
-		public void putAll(Map<? extends K, ? extends List<V>> map) {
-			this.map.putAll(map);
-		}
-
-		@Override
-		public void clear() {
-			this.map.clear();
-		}
-
-		@Override
-		public Set<K> keySet() {
-			return this.map.keySet();
-		}
-
-		@Override
-		public Collection<List<V>> values() {
-			return this.map.values();
-		}
-
-		@Override
-		public Set<Entry<K, List<V>>> entrySet() {
-			return this.map.entrySet();
-		}
-
-		@Override
-		public boolean equals(Object other) {
-			if (this == other) {
-				return true;
-			}
-			return this.map.equals(other);
-		}
-
-		@Override
-		public int hashCode() {
-			return this.map.hashCode();
-		}
-
-		@Override
-		public String toString() {
-			return this.map.toString();
-		}
-	}
-
 }

spring-core/src/main/java/org/springframework/util/FileSystemUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -24,9 +24,12 @@ import java.nio.file.Path;
 import java.nio.file.SimpleFileVisitor;
 import java.nio.file.StandardCopyOption;
 import java.nio.file.attribute.BasicFileAttributes;
+import java.util.EnumSet;
 
 import org.springframework.lang.Nullable;
 
+import static java.nio.file.FileVisitOption.FOLLOW_LINKS;
+
 /**
  * Utility methods for working with the file system.
  *
@@ -65,11 +68,11 @@ public abstract class FileSystemUtils {
 	}
 
 	/**
-	 * Delete the supplied {@link File} - for directories,
+	 * Delete the supplied {@link File} — for directories,
 	 * recursively delete any nested directories or files as well.
 	 * @param root the root {@code File} to delete
 	 * @return {@code true} if the {@code File} existed and was deleted,
-	 * or {@code false} it it did not exist
+	 * or {@code false} if it did not exist
 	 * @throws IOException in the case of I/O errors
 	 * @since 5.0
 	 */
@@ -123,7 +126,7 @@ public abstract class FileSystemUtils {
 		BasicFileAttributes srcAttr = Files.readAttributes(src, BasicFileAttributes.class);
 
 		if (srcAttr.isDirectory()) {
-			Files.walkFileTree(src, new SimpleFileVisitor<Path>() {
+			Files.walkFileTree(src, EnumSet.of(FOLLOW_LINKS), Integer.MAX_VALUE, new SimpleFileVisitor<Path>() {
 				@Override
 				public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
 					Files.createDirectories(dest.resolve(src.relativize(dir)));