AbstractAutoProxyCreator ignores unused early proxy references

Closes gh-22370

spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractAutoProxyCreator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -133,7 +133,7 @@ public abstract class AbstractAutoProxyCreator extends ProxyProcessorSupport
 
 	private final Set<String> targetSourcedBeans = Collections.newSetFromMap(new ConcurrentHashMap<>(16));
 
-	private final Set<Object> earlyProxyReferences = Collections.newSetFromMap(new ConcurrentHashMap<>(16));
+	private final Map<Object, Object> earlyProxyReferences = new ConcurrentHashMap<>(16);
 
 	private final Map<Object, Class<?>> proxyTypes = new ConcurrentHashMap<>(16);
 
@@ -236,9 +236,7 @@ public abstract class AbstractAutoProxyCreator extends ProxyProcessorSupport
 	@Override
 	public Object getEarlyBeanReference(Object bean, String beanName) {
 		Object cacheKey = getCacheKey(bean.getClass(), beanName);
-		if (!this.earlyProxyReferences.contains(cacheKey)) {
-			this.earlyProxyReferences.add(cacheKey);
-		}
+		this.earlyProxyReferences.put(cacheKey, bean);
 		return wrapIfNecessary(bean, beanName, cacheKey);
 	}
 
@@ -297,7 +295,7 @@ public abstract class AbstractAutoProxyCreator extends ProxyProcessorSupport
 	public Object postProcessAfterInitialization(@Nullable Object bean, String beanName) {
 		if (bean != null) {
 			Object cacheKey = getCacheKey(bean.getClass(), beanName);
-			if (!this.earlyProxyReferences.contains(cacheKey)) {
+			if (this.earlyProxyReferences.remove(cacheKey) != bean) {
 				return wrapIfNecessary(bean, beanName, cacheKey);
 			}
 		}