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