Clear cached executors in setBeanFactory (for reused AspectJ aspect)

Closes gh-28201

spring-aop/src/main/java/org/springframework/aop/interceptor/AsyncExecutionAspectSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -73,8 +73,6 @@ public abstract class AsyncExecutionAspectSupport implements BeanFactoryAware {
 
 	protected final Log logger = LogFactory.getLog(getClass());
 
-	private final Map<Method, AsyncTaskExecutor> executors = new ConcurrentHashMap<>(16);
-
 	private SingletonSupplier<Executor> defaultExecutor;
 
 	private SingletonSupplier<AsyncUncaughtExceptionHandler> exceptionHandler;
@@ -85,6 +83,9 @@ public abstract class AsyncExecutionAspectSupport implements BeanFactoryAware {
 	@Nullable
 	private StringValueResolver embeddedValueResolver;
 
+	private final Map<Method, AsyncTaskExecutor> executors = new ConcurrentHashMap<>(16);
+
+
 	/**
 	 * Create a new instance with a default {@link AsyncUncaughtExceptionHandler}.
 	 * @param defaultExecutor the {@code Executor} (typically a Spring {@code AsyncTaskExecutor}
@@ -157,6 +158,7 @@ public abstract class AsyncExecutionAspectSupport implements BeanFactoryAware {
 		if (beanFactory instanceof ConfigurableBeanFactory configurableBeanFactory) {
 			this.embeddedValueResolver = new EmbeddedValueResolver(configurableBeanFactory);
 		}
+		this.executors.clear();
 	}