Spring Boot Kafka：由于 NoSuchBeanDefinitionException 无法启动消费者

使用Spring Boot与Kafka进行消息传递是一种常见的方式，但有时候我们可能会遇到NoSuchBeanDefinitionException异常，导致消费者无法启动。本文将介绍这个问题的原因，并提供解决方案。

java
@Configuration
public class KafkaConsumerConfig {
    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;
    @Bean
    public ConsumerFactory consumerFactory() {
        Map props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        return new DefaultKafkaConsumerFactory<>(props);
    }
    @Bean
    public ConcurrentKafkaListenerContainerFactory kafkaListenerContainerFactory() {
        ConcurrentKafkaListenerContainerFactory factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory());
        return factory;
    }
}

java
@Component
public class KafkaConsumer {
    @KafkaListener(topics = "myTopic")
    public void consume(String message) {
        // 处理消息的逻辑
    }
}