本文介绍了Kafka Producer - 找不到 org.apache.kafka.common.serialization.StringSerializer的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我创建了一个简单的 Kafka Producer &消费者.我正在使用 kafka_2.11-0.9.0.0.这是我的生产者代码.
I have creating a simple Kafka Producer & Consumer.I am using kafka_2.11-0.9.0.0. Here is my Producer code.
public class KafkaProducerTest {
public static String topicName = "test-topic-2";
public static void main(String[] args) {
// TODO Auto-generated method stub
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer",
StringSerializer.class.getName());
props.put("value.serializer",
StringSerializer.class.getName());
Producer<String, String> producer = new KafkaProducer(props);
for (int i = 0; i < 100; i++) {
ProducerRecord<String, String> producerRecord = new ProducerRecord<String, String>(
topicName, Integer.toString(i), Integer.toString(i));
System.out.println(producerRecord);
producer.send(producerRecord);
}
producer.close();
}
}
在启动捆绑包时，我面临以下错误:
While starting the bundle I a facing the below error:
2016-05-20 09:44:57,792 | ERROR | nsole user karaf | ShellUtil | 44 - org.apache.karaf.shell.core - 4.0.3 | Exception caught while executing command
org.apache.karaf.shell.support.MultiException: Error executing command on bundles:
Error starting bundle162: Activator start error in bundle NewKafkaArtifact [162].
at org.apache.karaf.shell.support.MultiException.throwIf(MultiException.java:61)
at org.apache.karaf.bundle.command.BundlesCommand.doExecute(BundlesCommand.java:69)[24:org.apache.karaf.bundle.core:4.0.3]
at org.apache.karaf.bundle.command.BundlesCommand.execute(BundlesCommand.java:54)[24:org.apache.karaf.bundle.core:4.0.3]
at org.apache.karaf.shell.impl.action.command.ActionCommand.execute(ActionCommand.java:83)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:67)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:87)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)[44:org.apache.karaf.shell.core:4.0.3]
at org.apache.karaf.shell.impl.console.ConsoleSessionImpl.run(ConsoleSessionImpl.java:270)[44:org.apache.karaf.shell.core:4.0.3]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_66]
Caused by: java.lang.Exception: Error starting bundle162: Activator start error in bundle NewKafkaArtifact [162].
at org.apache.karaf.bundle.command.BundlesCommand.doExecute(BundlesCommand.java:66)[24:org.apache.karaf.bundle.core:4.0.3]
... 12 more
Caused by: org.osgi.framework.BundleException: Activator start error in bundle NewKafkaArtifact [162].
at org.apache.felix.framework.Felix.activateBundle(Felix.java:2276)[org.apache.felix.framework-5.4.0.jar:]
at org.apache.felix.framework.Felix.startBundle(Felix.java:2144)[org.apache.felix.framework-5.4.0.jar:]
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998)[org.apache.felix.framework-5.4.0.jar:]
at org.apache.karaf.bundle.command.Start.executeOnBundle(Start.java:38)[24:org.apache.karaf.bundle.core:4.0.3]
at org.apache.karaf.bundle.command.BundlesCommand.doExecute(BundlesCommand.java:64)[24:org.apache.karaf.bundle.core:4.0.3]
... 12 more
Caused by: org.apache.kafka.common.config.ConfigException: Invalid value org.apache.kafka.common.serialization.StringSerializer for configuration key.serializer: Class org.apache.kafka.common.serialization.StringSerializer could not be found.
at org.apache.kafka.common.config.ConfigDef.parseType(ConfigDef.java:255)[141:kafka-examples:1.0.0.SNAPSHOT-jar-with-dependencies]
at org.apache.kafka.common.config.ConfigDef.parse(ConfigDef.java:145)[141:kafka-examples:1.0.0.SNAPSHOT-jar-with-dependencies]
at org.apache.kafka.common.config.AbstractConfig.<init>(AbstractConfig.java:49)[141:kafka-examples:1.0.0.SNAPSHOT-jar-with-dependencies]
at org.apache.kafka.common.config.AbstractConfig.<init>(AbstractConfig.java:56)[141:kafka-examples:1.0.0.SNAPSHOT-jar-with-dependencies]
at org.apache.kafka.clients.producer.ProducerConfig.<init>(ProducerConfig.java:317)[141:kafka-examples:1.0.0.SNAPSHOT-jar-with-dependencies]
at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:181)[141:kafka-examples:1.0.0.SNAPSHOT-jar-with-dependencies]
at com.NewKafka.NewKafkaArtifact.KafkaProducerTest.main(KafkaProducerTest.java:25)[162:NewKafkaArtifact:0.0.1.SNAPSHOT]
at com.NewKafka.NewKafkaArtifact.StartKafka.start(StartKafka.java:11)[162:NewKafkaArtifact:0.0.1.SNAPSHOT]
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697)[org.apache.felix.framework-5.4.0.jar:]
at org.apache.felix.framework.Felix.activateBundle(Felix.java:2226)[org.apache.felix.framework-5.4.0.jar:]
... 16 more
我尝试设置 key.serializer 和 value.serializer 如下:
I have tried setting the key.serializer and value.serializer like below:
props.put("key.serializer",StringSerializer.class.getName());
props.put("value.serializer",StringSerializer.class.getName());
也一样，但还是出现同样的错误.我在这里做错了什么.
Also like, But still getting the same error. What is I am doing wrong here.
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
推荐答案
它与您使用的版本有关.也有人建议使用 0.8.2.2_1 版本.建议您调整您使用的kafka版本并尝试.在代码方面，我交叉检查了 kafka 开发列表中的许多代码示例，似乎您的编写方式正确.
Its issue with the version you are using.It was also suggested to version 0.8.2.2_1.Suggest you to adjust the version of kafka you are using and give a try.code wise, I cross checked many code samples in kafka dev list and seems like you have written in right way.
即Thread.currentThread().setContextClassLoader(null);
这篇关于Kafka Producer - 找不到 org.apache.kafka.common.serialization.StringSerializer的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！