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.
@@ -130,8 +130,7 @@ public abstract class AbstractAutoProxyCreator extends ProxyProcessorSupport
 	private final Set<String> targetSourcedBeans =
 			Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>(16));
 
-	private final Set<Object> earlyProxyReferences =
-			Collections.newSetFromMap(new ConcurrentHashMap<Object, Boolean>(16));
+	private final Map<Object, Object> earlyProxyReferences = new ConcurrentHashMap<Object, Object>(16);
 
 	private final Map<Object, Class<?>> proxyTypes = new ConcurrentHashMap<Object, Class<?>>(16);
 
@@ -231,9 +230,7 @@ public Constructor<?>[] determineCandidateConstructors(Class<?> beanClass, Strin
 	@Override
 	public Object getEarlyBeanReference(Object bean, String beanName) throws BeansException {
 		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);
 	}
 
@@ -294,7 +291,7 @@ public Object postProcessBeforeInitialization(Object bean, String beanName) {
 	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
 		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);
 			}
 		}