spark kafka streaming Error - " java.lang.NoClassDefFoundError: org/apache/spark/streaming/kafka/KafkaUtils

Question

我正在 eclipse 中编写一个简单的 kafka - spark 流代码，以使用 spark 流处理来自 kafka 代理的消息。下面是代码，当我尝试运行来自 eclipse 的代码时收到错误。

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
  }
}

异常：

线程异常 "main" java.lang.NoClassDefFoundError: org/apache/spark/streaming/kafka/KafkaUtils$ 在 org.firststream.spark_kakfa.spark_kafka_streaming$.main(spark_kafka_streaming.scala:30) 在 org.firststream.spark_kakfa.spark_kafka_streaming.main(spark_kafka_streaming.scala) 原因：java.lang.ClassNotFoundException：org.apache.spark.streaming.kafka.KafkaUtils$ 在 java.net.URLClassLoader.findClass（来源不明）在 java.lang.ClassLoader.loadClass（来源不明）在 sun.misc.Launcher$AppClassLoader.loadClass（未知来源）在 java.lang.ClassLoader.loadClass（来源不明） ... 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 spark-streaming-kafka_2.10 并添加 kafka_2.10-0.8.1.1 jar 到 eclpise 中的引用库，方法是直接单击构建路径 -> 配置构建路径 -> 外部 Jars。这解决了问题。

<!-- 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 - " java.lang.NoClassDefFoundError: org/apache/spark/streaming/kafka/KafkaUtils

spark kafka streaming Error - " java.lang.NoClassDefFoundError: org/apache/spark/streaming/kafka/KafkaUtils

streaming

apache-kafka

apache-spark

spark-streaming-kafka