尝试使用 kafka-client 2.6 时出错 [英] Error when trying to use kafka-client 2.6

问题描述

我正在学习 Kafka，当我试图实现一个只发送Hello World"的简单生产者时

I'm learning Kafka and when I was trying to implement a simple producer that will only send "Hello World"

package com.github.joe.kafka.tutorial1;

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.StringSerializer;

import java.util.Properties;

public class ProducerDemo {
    public static void main(String[] args) {

        Properties properties = new Properties();
        String bootstrapServers = "127.0.0.1:9092";
        String topic = "first_topic";
        properties.setProperty(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,bootstrapServers);
        properties.setProperty(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
        properties.setProperty(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,StringSerializer.class.getName());

        KafkaProducer<String,String> producer = new KafkaProducer<String, String>(properties);

        ProducerRecord<String,String> record = new ProducerRecord<String, String>(topic,"Hello World");

        producer.send(record);
        producer.flush();
        producer.close();

    }
}

问题是当我使用 kafka-client v2.0.0 时它可以工作，但是当我使用 kafka-client 2.6.0 时它失败并且我收到以下错误:

The problem is when I'm using kafka-client v2.0.0 it works, but it fails when I'm using kafka-client 2.6.0 and I get the following error:

[kafka-producer-network-thread | producer-1] ERROR org.apache.kafka.common.utils.KafkaThread - Uncaught exception in thread 'kafka-producer-network-thread | producer-1':
java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/JsonNode
    at org.apache.kafka.common.requests.ApiVersionsRequest$Builder.<clinit>(ApiVersionsRequest.java:36)
    at org.apache.kafka.clients.NetworkClient.handleConnections(NetworkClient.java:910)
    at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:555)
    at org.apache.kafka.clients.producer.internals.Sender.runOnce(Sender.java:325)
    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:240)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.JsonNode
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    ... 6 more
[main] INFO org.apache.kafka.clients.producer.KafkaProducer - [Producer clientId=producer-1] Closing the Kafka producer with timeoutMillis = 9223372036854775807 ms.

推荐答案

事实证明，对于 Kafka-client 2.6.0 有一个额外的依赖:杰克逊数据绑定这不是 2.0.0 版所必需的

as it turns out , for Kafka-client 2.6.0 there's an additional dependency: Jackson Databind this was not required for version 2.0.0

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