kafka 生产者示例 - 找不到类异常

Question

I'm trying to run the kafka producer example as described on the kafka docs ( found here ).

However, when I try to run the producer I get a class not found exception:

Exception in thread "main" java.lang.NoClassDefFoundError: kafka/producer/ProducerConfig at com.t4g.app.RandomProducer.main(TestProducer.java:20) Caused by: java.lang.ClassNotFoundException: kafka.producer.ProducerConfig

Here is my dependency file:

<dependency>
  <groupId>org.apache.kafka</groupId>
  <artifactId>kafka_2.9.2</artifactId>
  <version>0.8.1.1</version>
  <scope>compile</scope>
  <exclusions>
    <exclusion>
      <artifactId>jmxri</artifactId>
      <groupId>com.sun.jmx</groupId>
    </exclusion>
    <exclusion>
      <artifactId>jms</artifactId>
      <groupId>javax.jms</groupId>
    </exclusion>
    <exclusion>
      <artifactId>jmxtools</artifactId>
      <groupId>com.sun.jdmk</groupId>
    </exclusion>
  </exclusions>
</dependency>

Answer 1

I am able to run the code using your pom.xml. Are you able to see ProducerConfig class in Maven dependencies?

Try a clean build or delete the existing Kafka package [kafka_2.9.2-0.8.1.1.jar] from Maven repository, update project to download the package again and see if it works for you.

Answer 2

Add the following in your pom.xml. It will fix your issue.