Polishing

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

@@ -31,7 +31,6 @@ import java.util.Collection;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
 import java.util.concurrent.ConcurrentHashMap;
@@ -156,7 +155,7 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	private final NamedThreadLocal<String> currentlyCreatedBean = new NamedThreadLocal<>("Currently created bean");
 
 	/** Cache of unfinished FactoryBean instances: FactoryBean name --> BeanWrapper */
-	private final Map<String, BeanWrapper> factoryBeanInstanceCache = new ConcurrentHashMap<>(16);
+	private final ConcurrentMap<String, BeanWrapper> factoryBeanInstanceCache = new ConcurrentHashMap<>(16);
 
 	/** Cache of filtered PropertyDescriptors: bean Class -> PropertyDescriptor array */
 	private final ConcurrentMap<Class<?>, PropertyDescriptor[]> filteredPropertyDescriptorsCache =

spring-beans/src/test/java/org/springframework/beans/factory/annotation/InjectAnnotationBeanPostProcessorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -47,7 +47,7 @@ import static org.junit.Assert.*;
 
 /**
  * Unit tests for {@link org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor}
- * processing the JSR-303 {@link javax.inject.Inject} annotation.
+ * processing the JSR-330 {@link javax.inject.Inject} annotation.
  *
  * @author Juergen Hoeller
  * @since 3.0
@@ -550,11 +550,9 @@ public class InjectAnnotationBeanPostProcessorTests {
 	}
 
 	/**
-	 * Verifies that a dependency on a {@link org.springframework.beans.factory.FactoryBean} can be autowired via
-	 * {@link org.springframework.beans.factory.annotation.Autowired @Inject}, specifically addressing the JIRA issue
-	 * raised in <a
-	 * href="http://opensource.atlassian.com/projects/spring/browse/SPR-4040"
-	 * target="_blank">SPR-4040</a>.
+	 * Verifies that a dependency on a {@link org.springframework.beans.factory.FactoryBean}
+	 * can be autowired via {@link org.springframework.beans.factory.annotation.Autowired @Inject},
+	 * specifically addressing SPR-4040.
 	 */
 	@Test
 	public void testBeanAutowiredWithFactoryBean() {
@@ -1315,7 +1313,7 @@ public class InjectAnnotationBeanPostProcessorTests {
 	public static class StringFactoryBean implements FactoryBean<String> {
 
 		@Override
-		public String getObject() throws Exception {
+		public String getObject() {
 			return "";
 		}
 

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

@@ -430,7 +430,8 @@ public class ResolvableType implements Serializable {
 		if (this == NONE) {
 			return NONE;
 		}
-		if (ObjectUtils.nullSafeEquals(resolve(), type)) {
+		Class<?> resolved = resolve();
+		if (resolved == null || resolved == type) {
 			return this;
 		}
 		for (ResolvableType interfaceType : getInterfaces()) {
@@ -468,7 +469,7 @@ public class ResolvableType implements Serializable {
 	 */
 	public ResolvableType[] getInterfaces() {
 		Class<?> resolved = resolve();
-		if (resolved == null || ObjectUtils.isEmpty(resolved.getGenericInterfaces())) {
+		if (resolved == null || resolved.getGenericInterfaces().length == 0) {
 			return EMPTY_TYPES_ARRAY;
 		}
 		ResolvableType[] interfaces = this.interfaces;
@@ -818,7 +819,7 @@ public class ResolvableType implements Serializable {
 
 	@Nullable
 	private Type resolveBounds(Type[] bounds) {
-		if (ObjectUtils.isEmpty(bounds) || Object.class == bounds[0]) {
+		if (bounds.length == 0 || bounds[0] == Object.class) {
 			return null;
 		}
 		return bounds[0];
@@ -1638,6 +1639,9 @@ public class ResolvableType implements Serializable {
 	}
 
 
+	/**
+	 * Internal {@link Type} used to represent an empty value.
+	 */
 	@SuppressWarnings("serial")
 	static class EmptyType implements Type, Serializable {