Question

我试图将Storm与Kafka整合在一起。我使用KafkaSpout运行Storm拓扑。这是基本的字数统计拓扑。我使用Apache Kafka作为处理数据的源和风暴。在提交拓扑时，我正面临着这些问题。我是卡夫卡和风暴的新手。请在以下代码中向我建议我需要做的更改。

这是我的代码：

public class TopologyMain {

private static final String SENTENCE_SPOUT_ID = "kafka-sentence-spout";
  private static final String WORD_NORMALIZER = "word-normalizer";
  private static final String WORD_COUNTER = "word-counter";
  private static final String TOPOLOGY_NAME = "kafka-word-count-topology";  


  public static void main(String[] args) throws InterruptedException, AlreadyAliveException, InvalidTopologyException {

      int numSpoutExecutors = 1;

      KafkaSpout kspout = buildKafkaSentenceSpout();
        WordNormalizer normalizeBolt = new WordNormalizer();
        WordCounter countBolt = new WordCounter();



    //Topology definition
    TopologyBuilder builder = new TopologyBuilder();

    builder.setSpout(SENTENCE_SPOUT_ID, kspout, numSpoutExecutors);
    builder.setBolt(WORD_NORMALIZER, new WordNormalizer()).shuffleGrouping(SENTENCE_SPOUT_ID);
    builder.setBolt(WORD_COUNTER, new WordCounter(),1).fieldsGrouping(WORD_NORMALIZER, new Fields("word"));

    //Configuration
    Config conf = new Config();
    //System.setProperty("storm.jar", "/home/raremile/.m2/repository/org/apache/storm/storm-core/0.9.3/storm-core-0.9.3.jar");
    StormSubmitter.submitTopology(TOPOLOGY_NAME, conf, builder.createTopology());
    conf.setDebug(false);

}

  private static KafkaSpout buildKafkaSentenceSpout() {
        String zkHostPort = "localhost:2181";
        String topic = "sentences";

        String zkRoot = "/acking-kafka-sentence-spout";
        String zkSpoutId = "acking-sentence-spout";
        ZkHosts zkHosts = new ZkHosts(zkHostPort);

        SpoutConfig spoutCfg = new SpoutConfig(zkHosts, topic, zkRoot, zkSpoutId);
        KafkaSpout kafkaSpout = new KafkaSpout(spoutCfg);
        return kafkaSpout;
      }
}

这是我得到的错误：

 Exception in thread "main" java.lang.NoClassDefFoundError: backtype/storm/spout/MultiScheme
at TopologyMain.buildKafkaSentenceSpout(TopologyMain.java:57)
at TopologyMain.main(TopologyMain.java:28)
Caused by: java.lang.ClassNotFoundException: backtype.storm.spout.MultiScheme
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 2 more

Answer 1

看起来你错过了类路径中的storm-core jar。下载并添加它。

线程“main”中的异常java.lang.NoClassDefFoundError：backtype / storm / spout / MultiScheme

1 个答案: