java Apache Kafka 异常：org.apache.kafka.clients.consumer.KafkaConsumer.subscribe(Ljava/util/List;)V
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Apache Kafka-Exception : org.apache.kafka.clients.consumer.KafkaConsumer.subscribe(Ljava/util/List;)V
提问by vaquar khan
I am using Apache Kafka version kafka_2.10-0.10.1.0
我正在使用 Apache Kafka 版本 kafka_2.10-0.10.1.0
During Poc i have created simple producer and consumer. When i am try to consume message getting following error :
在 Poc 期间，我创建了简单的生产者和消费者。当我尝试使用消息时出现以下错误：
Exception in thread "Thread-0" java.lang.NoSuchMethodError: org.apache.kafka.clients.consumer.KafkaConsumer.subscribe(Ljava/util/List;)V
at com.spnotes.kafka.simple.Consumer$ConsumerThread.run(Consumer.java:59)
Code :
代码 ：
package com.spnotes.kafka.simple;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.errors.WakeupException;
import java.util.Arrays;
import java.util.Properties;
import java.util.Scanner;
public class Consumer {
private static Scanner in;
public static void main(String[] argv)throws Exception{
if (argv.length != 2) {
System.err.printf("Usage: %s <topicName> <groupId>\n",
Consumer.class.getSimpleName());
System.exit(-1);
}
in = new Scanner(System.in);
String topicName = argv[0];
String groupId = argv[1];
ConsumerThread consumerRunnable = new ConsumerThread(topicName,groupId);
consumerRunnable.start();
String line = "";
while (!line.equals("exit")) {
line = in.next();
}
consumerRunnable.getKafkaConsumer().wakeup();
System.out.println("Stopping consumer .....");
consumerRunnable.join();
}
private static class ConsumerThread extends Thread{
private String topicName;
private String groupId;
private KafkaConsumer<String,String> kafkaConsumer;
public ConsumerThread(String topicName, String groupId){
this.topicName = topicName;
this.groupId = groupId;
}
public void run() {
Properties configProperties = new Properties();
configProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
configProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.ByteArrayDeserializer");
configProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
configProperties.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
configProperties.put(ConsumerConfig.CLIENT_ID_CONFIG, "simple");
//Figure out where to start processing messages from
kafkaConsumer = new KafkaConsumer<String, String>(configProperties);
kafkaConsumer.subscribe(Arrays.asList(topicName));
//Start processing messages
try {
while (true) {
ConsumerRecords<String, String> records = kafkaConsumer.poll(100);
for (ConsumerRecord<String, String> record : records)
System.out.println(record.value());
}
}catch(WakeupException ex){
System.out.println("Exception caught " + ex.getMessage());
}finally{
kafkaConsumer.close();
System.out.println("After closing KafkaConsumer");
}
}
public KafkaConsumer<String,String> getKafkaConsumer(){
return this.kafkaConsumer;
}
}
}
Ruining using command :
使用命令破坏：
java -cp .:/home/osboxes/Kafka/kafka_2.10-0.10.1.1/libs/*:/home/osboxes/Kafka/kafka_2.10-0.10.1.1/libs/KafkaAPIClient-1.0-SNAPSHOT.jar com.spnotes.kafka.simple.Consumer test group1
Error :
错误 ：
Exception in thread "Thread-0" java.lang.NoSuchMethodError: org.apache.kafka.clients.consumer.KafkaConsumer.subscribe(Ljava/util/List;)V
at com.spnotes.kafka.simple.Consumer$ConsumerThread.run(Consumer.java:59)
回答by vaquar khan
I was using wrong API thanks for amethystic . After adding new client version it's start working
感谢 amethystic，我使用了错误的 API。添加新的客户端版本后，它开始工作
Old API was in POM
旧 API 在 POM 中
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.9.0.0</version>
</dependency>
Added new API in POM
在 POM 中添加了新的 API
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.10.0.0</version>
</dependency>
No backward compatibility between Kafka API old and new version
Kafka API 新旧版本之间没有向后兼容性
