java - 运行就绪代码期间出现异常

Question

当我使用 Eclipse 导入编写的代码并将其作为 java 应用程序运行时，在运行就绪代码期间出现异常

这是错误...

Exception in thread "main" java.lang.NoSuchMethodError: backtype.storm.topology.TopologyBuilder.setBolt(Ljava/lang/String;Lbacktype/storm/    topology/IBasicBolt;Ljava/lang/Integer;)Lbacktype/storm/topology/BoltDeclarer; 
at TopologyMain.main(TopologyMain.java:18)

代码是

import spouts.WordReader; 
import backtype.storm.Config; 
import backtype.storm.LocalCluster;
import backtype.storm.topology.TopologyBuilder; 
import backtype.storm.tuple.Fields; 
import bolts.WordCounter; import bolts.WordNormalizer;

public class TopologyMain { public static void main(String[] args) throws InterruptedException { 
  //Topology definition 
  TopologyBuilder builder = new TopologyBuilder(); 
  builder.setSpout("word-reader",new WordReader());
  builder.setBolt("word-normalizer", new WordNormalizer()).shuffleGrouping("word-reader");
  builder.setBolt("word-counter", new WordCounter(),1).fieldsGrouping("word- normalizer", new Fields("word"));

  //Configuration 
  Config conf = new Config();
  conf.put("wordsFile",  args[0]);  onf.setDebug(false);

  //Topology run 
  conf.put(Config.TOPOLOGY_MAX_SPOUT_PENDING, 1);

  LocalCluster cluster = new LocalCluster(); 
  cluster.submitTopology("Getting-Started-Toplogie", conf,  builder.createTopology());

  Thread.sleep(1000); cluster.shutdown(); 
  }
}

Answer 1

您可能已经修改了 TopologyBuilder 类或具有该类的 JAR。因为这种错误意味着类的编译时版本和运行时版本不相同，即 .class 在编译程序后已被某种方式修改。特别是，程序是使用 setBolt() 方法编译的，之后该方法在 .class 中被删除、重命名或修改