Question

我正在eclipse中编写一个简单的kafka - spark流代码，使用spark streaming来消费来自kafka broker的消息。下面是代码，当我尝试从eclipse运行代码时收到错误。

我还确保依赖jar已经到位，请帮助摆脱这个错误

对象spark_kafka_streaming {

def main(args: Array[String]) {

val conf = new SparkConf()
  .setAppName("The swankiest Spark app ever")
  .setMaster("local[*]")

val ssc = new StreamingContext(conf, Seconds(60))
ssc.checkpoint("C:\\keerthi\\software\\eclipse-jee-mars-2-win32-  x86_64\\eclipse")

    println("Parameters:" + "zkorum:" + "group:" + "topicMap:"+"number of threads:")

val zk = "xxxxxxxx:2181"
val group = "test-consumer-group"
val topics = "my-replicated-topic"
val numThreads = 2

val topicMap =  topics.split(",").map((_,numThreads.toInt)).toMap

val lines = KafkaUtils.createStream(ssc,zk,group,topicMap).map(_._2)
val words = lines.flatMap(_.split(" "))
val wordCounts = words.map(x => (x,1L)).count()

println("wordCounts:"+wordCounts)

//wordCounts.print
  }
}

例外：

线程中的异常＆＃34; main＆＃34; java.lang.NoClassDefFoundError：org / apache / spark / streaming / kafka / KafkaUtils $ 在org.firststream.spark_kakfa.spark_kafka_streaming $ .main（spark_kafka_streaming.scala：30）在org.firststream.spark_kakfa.spark_kafka_streaming.main（spark_kafka_streaming.scala）引起：java.lang.ClassNotFoundException：org.apache.spark.streaming.kafka.KafkaUtils $ at java.net.URLClassLoader.findClass（Unknown Source） at java.lang.ClassLoader.loadClass（Unknown Source） at sun.misc.Launcher $ AppClassLoader.loadClass（Unknown Source） at java.lang.ClassLoader.loadClass（Unknown Source） ......还有2个

依赖关系：

   <dependency>
      <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.10</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>

<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.8.2.0</version>
</dependency>

<dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-streaming-kafka_2.10</artifactId>
    <version>1.2.0</version>
</dependency>

<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.10</artifactId>      
<version>1.2.0</version>
</dependency>

Answer 1

我评论了以下依赖项。添加了spark-streaming-kafka_2.10，并通过点击buildpath直接将kafka_2.10-0.8.1.1 jar添加到eclpise中的引用库中 - ＆gt;配置构建路径 - ＆gt;外部罐子。这解决了这个问题。

<!-- dependency>
  <groupId>org.apache.kafka</groupId>
  <artifactId>kafka_2.10</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> -->

 <!--<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.8.2.0</version>
</dependency>-->

<!-- <dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-streaming-kafka_2.10</artifactId>
    <version>1.2.0</version>
</dependency>-->

spark kafka streaming Error - ＆＃34; java.lang.NoClassDefFoundError：org / apache / spark / streaming / kafka / KafkaUtils

1 个答案: