我正在尝试将Storm与Kafka集成。我正在使用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，我面临这些问题。我对Kafka和Storm非常陌生。请建议我在以下代码中进行的更改。
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
最佳答案
似乎您错过了类路径中的storm-core jar。下载并添加。
关于java - 线程“main”中的异常java.lang.NoClassDefFoundError:backtype/storm/spout/MultiScheme，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30366277/