编写customConsumerFactory和customKafkaListenerContainerFactory时不会自动加载Spring Kafka属性 [英] spring kafka properties not auto loaded when writing customConsumerFactory and customKafkaListenerContainerFactory

问题描述

我想从application.properties加载spring-kafka属性，并且必须使用spring自动配置加载.我的问题是由以下原因引起的:java.lang.IllegalStateException:没有可用的确认作为参数，侦听器容器必须具有MANUAL AckMode才能填充确认，但是我已经在属性文件spring.kafka.listener.ack-mode =中进行了设置但是，由于此属性是我的自定义fooKafkaListenerContainerFactory，因此在此属性中需要手动立即执行.无法选择此设置.我想要的是没有手动设置的情况，应该从我的application.properies中拾取它.@Gary Russell感谢您的帮助.

I want to load my spring-kafka properties from application.properties and that must be loaded using spring auto configuration. My problem is Caused by: java.lang.IllegalStateException: No Acknowledgment available as an argument, the listener container must have a MANUAL AckMode to populate the Acknowledgment however I have already set it in properties file spring.kafka.listener.ack-mode=manual-immediate in this properties however because it's my custom fooKafkaListenerContainerFactory It's not able to pick this settings. What I want is without setting it manually it should be picked up from my application.properies. @Gary Russell your help is appreciated.

我的代码如下所示

package com.foo;

import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.kafka.ConcurrentKafkaListenerContainerFactoryConfigurer;
import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.support.serializer.JsonDeserializer;

import com.foo.FooKafkaDTO;

@Configuration
public class KafkaConsumerConfig {

    @Autowired
    private KafkaProperties kafkaProperties;

    @Bean
    @ConditionalOnMissingBean(ConsumerFactory.class)
    public ConsumerFactory<?, ?> kafkaConsumerFactory() {

        return new DefaultKafkaConsumerFactory<>(kafkaProperties.buildConsumerProperties());
    }

    @Bean
    @ConditionalOnMissingBean(name = "kafkaListenerContainerFactory")
    public ConcurrentKafkaListenerContainerFactory<?, ?> kafkaListenerContainerFactory(
            ConcurrentKafkaListenerContainerFactoryConfigurer configurer,
            ConsumerFactory<Object, Object> kafkaConsumerFactory) {

        ConcurrentKafkaListenerContainerFactory<Object, Object> factory = new ConcurrentKafkaListenerContainerFactory<Object, Object>();
        configurer.configure(factory, kafkaConsumerFactory);
        return factory;
    }

    @Bean
    public ConsumerFactory<String, FooKafkaDTO> fooConsumerFactory() {

        return new DefaultKafkaConsumerFactory<>(
                kafkaProperties.buildConsumerProperties(), new StringDeserializer(), new JsonDeserializer<>(FooKafkaDTO.class));
    }

    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, FooKafkaDTO> fooKafkaListenerContainerFactory(
            ConcurrentKafkaListenerContainerFactoryConfigurer configurer,
            ConsumerFactory<String, FooKafkaDTO> fooConsumerFactory) {

        ConcurrentKafkaListenerContainerFactory<String, FooKafkaDTO> factory =
                new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(fooConsumerFactory());
        return factory;
    }
}


Here are my properties 

spring.kafka.bootstrap-servers=localhost:9092
spring.kafka.listener.ack-mode=manual-immediate
spring.kafka.consumer.group-id=group_id
spring.kafka.consumer.auto-offset-reset=latest
spring.kafka.consumer.enable.auto.commit=false
spring.kafka.consumer.key-deserialize=org.springframework.kafka.support.serializer.JsonDeserializer
spring.kafka.consumer.value-deserialize=org.springframework.kafka.support.serializer.JsonDeserializer


Here is my listener

@Service
public class Consumer {

    private static final Log LOG = LogFactory.getLog(Consumer.class);

    @KafkaListener(
            topicPartitions = {@TopicPartition(topic = "outbox.foo",
                    partitionOffsets = @PartitionOffset(partition = "0", initialOffset = "0"))},
            groupId = "group_id",
            containerFactory = "fooKafkaListenerContainerFactory")
    public void consume(@Payload FooKafkaDTO fooKafkaDTO, Acknowledgment acknowledgment,
            @Headers MessageHeaders headers) {

        LOG.info("offset:::" + Long.valueOf(headers.get(KafkaHeaders.OFFSET).toString()));
        LOG.info(String.format("$$ -> Consumed Message -> %s", fooKafkaDTO));
        acknowledgment.acknowledge();

    }
}

推荐答案

浏览了spring-kafka的文档后

After going through the documentation of spring-kafka spring-kafka-official-documentation! I could find this code which replaced the whole boilerplate code. I have simplified my KafkaConsumerConfig class and it looks like below now.

package com.foo

import java.util.Map;

import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.support.serializer.JsonDeserializer;

import com.foo.FooKafkaDTO;

@Configuration
public class KafkaConsumerConfig {

    @Bean
    public DefaultKafkaConsumerFactory fooDTOConsumerFactory(KafkaProperties properties) {

        Map<String, Object> props = properties.buildConsumerProperties();
        return new DefaultKafkaConsumerFactory(props,
                new JsonDeserializer<>(String.class)
                        .forKeys()
                        .ignoreTypeHeaders(),
                new JsonDeserializer<>(FooKafkaDTO.class)
                        .ignoreTypeHeaders());

    }
}

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