diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanFactory.java b/spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanFactory.java
index 2d307db742b..9197a6ec698 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanFactory.java
+++ b/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.
@@ -1280,7 +1280,7 @@ 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");
 							}
 						}
 					}
@@ -1295,7 +1295,7 @@ 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.
diff --git a/spring-context/src/main/java/org/springframework/context/annotation/AutoProxyRegistrar.java b/spring-context/src/main/java/org/springframework/context/annotation/AutoProxyRegistrar.java
index 770070b3545..33aafa2204b 100644
--- a/spring-context/src/main/java/org/springframework/context/annotation/AutoProxyRegistrar.java
+++ b/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 {
 
diff --git a/spring-web/src/main/java/org/springframework/http/codec/json/AbstractJackson2Encoder.java b/spring-web/src/main/java/org/springframework/http/codec/json/AbstractJackson2Encoder.java
index f59023f1320..58163a92eac 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/json/AbstractJackson2Encoder.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/json/AbstractJackson2Encoder.java
@@ -67,7 +67,7 @@ public abstract class AbstractJackson2Encoder extends Jackson2CodecSupport imple
 	private static final Map<MediaType, byte[]> STREAM_SEPARATORS;
 
 	static {
-		STREAM_SEPARATORS = new HashMap<>();
+		STREAM_SEPARATORS = new HashMap<>(4);
 		STREAM_SEPARATORS.put(MediaType.APPLICATION_STREAM_JSON, NEWLINE_SEPARATOR);
 		STREAM_SEPARATORS.put(MediaType.parseMediaType("application/stream+x-jackson-smile"), new byte[0]);
 	}