Merge branch '6.0.x'

# Conflicts:
#	spring-r2dbc/src/main/java/org/springframework/r2dbc/connection/R2dbcTransactionManager.java
#	spring-r2dbc/src/test/java/org/springframework/r2dbc/connection/R2dbcTransactionManagerUnitTests.java

spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java

@@ -1084,6 +1084,9 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 			// Let subclasses do some final clean-up if they wish...
 			onClose();
 
+			// Reset common introspection caches to avoid class reference leaks.
+			resetCommonCaches();
+
 			// Reset local application listeners to pre-refresh state.
 			if (this.earlyApplicationListeners != null) {
 				this.applicationListeners.clear();