【发布时间】：2021-11-09 22:53:07
【问题描述】：
我第一次使用 Spring Kafka，我无法在我的消费者代码中使用 Acknowledgement.acknowledge() 方法进行手动提交，如此处https://docs.spring.io/spring-kafka/reference/html/_reference.html#committing-offsets 所述。我的是弹簧启动应用程序。如果我不使用手动提交过程，那么我的代码就可以正常工作。但是当我使用 Acknowledgement.acknowledge() 用于手动提交，它显示与 bean 相关的错误。另外，如果我没有正确使用手动提交，请建议我正确的方法。
错误信息：
***************************
APPLICATION FAILED TO START
***************************
Description:
Field ack in Receiver required a bean of type 'org.springframework.kafka.support.Acknowledgment' that could not be found.
Action:
Consider defining a bean of type 'org.springframework.kafka.support.Acknowledgment' in your configuration.
我在谷歌上搜索了这个错误，发现我需要添加@Component，但这已经在我的消费者代码中了。
我的消费者代码如下所示：Receiver.java
import java.util.concurrent.CountDownLatch;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.stereotype.Component;
@Component
public class Receiver {
@Autowired
public Acknowledgment ack;
private CountDownLatch latch = new CountDownLatch(1);
@KafkaListener(topics = "${kafka.topic.TestTopic}")
public void receive(ConsumerRecord<?, ?> consumerRecord){
System.out.println(consumerRecord.value());
latch.countDown();
ack.acknowledge();
}
}
我的生产者代码如下所示：Sender.java
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;
@Component
public class Sender {
@Autowired
private KafkaTemplate<String, Map<String, Object>> kafkaTemplate;
public void send(Map<String, Object> map){
kafkaTemplate.send("TestTopic", map);
}
}
编辑 1：
我的新消费者代码如下所示：Receiver.java
import java.util.concurrent.CountDownLatch;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.support.Acknowledgment;
import org.springframework.stereotype.Component;
@Component
public class Receiver {
private CountDownLatch latch = new CountDownLatch(1);
@KafkaListener(topics = "${kafka.topic.TestTopic}", containerFactory = "kafkaManualAckListenerContainerFactory")
public void receive(ConsumerRecord<?, ?> consumerRecord, Acknowledgment ack){
System.out.println(consumerRecord.value());
latch.countDown();
ack.acknowledge();
}
}
我也改变了我的配置类：
import java.util.HashMap;
import java.util.Map;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
@Configuration
@EnableKafka
public class ReceiverConfig {
@Value("${kafka.bootstrap-servers}")
private String bootstrapServers;
@Value("${spring.kafka.consumer.group-id}")
private String consumerGroupId;
@Bean
public Map<String, Object> consumerConfigs() throws SendGridException {
Map<String, Object> 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);
props.put(ConsumerConfig.GROUP_ID_CONFIG, consumerGroupId);
return props;
}
@Bean
public ConsumerFactory<String, String> consumerFactory(){
return new DefaultKafkaConsumerFactory<>(consumerConfigs());
}
/*@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory(){
ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}*/
@Bean
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaManualAckListenerContainerFactory(){
ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
@Bean
public Receiver receiver() {
return new Receiver();
}
}
将 containerFactory = "kafkaManualAckListenerContainerFactory" 添加到我的 receive() 方法后，我收到以下错误。
***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 1 of method kafkaListenerContainerFactory in org.springframework.boot.autoconfigure.kafka.KafkaAnnotationDrivenConfiguration required a bean of type 'org.springframework.kafka.core.ConsumerFactory' that could not be found.
- Bean method 'kafkaConsumerFactory' in 'KafkaAutoConfiguration' not loaded because @ConditionalOnMissingBean (types: org.springframework.kafka.core.ConsumerFactory; SearchStrategy: all) found bean 'consumerFactory'
Action:
Consider revisiting the conditions above or defining a bean of type 'org.springframework.kafka.core.ConsumerFactory' in your configuration.
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标签： java spring-boot kafka-consumer-api spring-kafka