Merge pull request #32770 from YuanHao97

* pr/32770:
  Polish 'Use more specific bean method return types in KafkaAutoConfiguration'
  Use more specific bean method return types in KafkaAutoConfiguration

Closes gh-32770

Author: philwebb

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -75,13 +75,13 @@ public KafkaAutoConfiguration(KafkaProperties properties) {
 
 	@Bean
 	@ConditionalOnMissingBean(ProducerListener.class)
-	public ProducerListener<Object, Object> kafkaProducerListener() {
+	public LoggingProducerListener<Object, Object> kafkaProducerListener() {
 		return new LoggingProducerListener<>();
 	}
 
 	@Bean
 	@ConditionalOnMissingBean(ConsumerFactory.class)
-	public ConsumerFactory<?, ?> kafkaConsumerFactory(
+	public DefaultKafkaConsumerFactory<?, ?> kafkaConsumerFactory(
 			ObjectProvider<DefaultKafkaConsumerFactoryCustomizer> customizers) {
 		DefaultKafkaConsumerFactory<Object, Object> factory = new DefaultKafkaConsumerFactory<>(
 				this.properties.buildConsumerProperties());
@@ -91,7 +91,7 @@ public ProducerListener<Object, Object> kafkaProducerListener() {
 
 	@Bean
 	@ConditionalOnMissingBean(ProducerFactory.class)
-	public ProducerFactory<?, ?> kafkaProducerFactory(
+	public DefaultKafkaProducerFactory<?, ?> kafkaProducerFactory(
 			ObjectProvider<DefaultKafkaProducerFactoryCustomizer> customizers) {
 		DefaultKafkaProducerFactory<?, ?> factory = new DefaultKafkaProducerFactory<>(
 				this.properties.buildProducerProperties());