apache/hadoop · error · RuntimeException

{classpathFile} not found on CLASSPATH

Error message

{classpathFile} not found on CLASSPATH

What it means

Error "{classpathFile} not found on CLASSPATH" thrown in apache/hadoop.

Source

Thrown at hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JobClient.java:911

  ) throws IOException, InterruptedException {
    return ((NetworkedJob)job).monitorAndPrintJob();
  }

  static String getTaskLogURL(TaskAttemptID taskId, String baseUrl) {
    return (baseUrl + "/tasklog?plaintext=true&attemptid=" + taskId); 
  }
  
  static Configuration getConfiguration(String jobTrackerSpec)
  {
    Configuration conf = new Configuration();
    if (jobTrackerSpec != null) {        
      if (jobTrackerSpec.indexOf(":") >= 0) {
        conf.set("mapred.job.tracker", jobTrackerSpec);
      } else {
        String classpathFile = "hadoop-" + jobTrackerSpec + ".xml";
        URL validate = conf.getResource(classpathFile);
        if (validate == null) {
          throw new RuntimeException(classpathFile + " not found on CLASSPATH");
        }
        conf.addResource(classpathFile);
      }
    }
    return conf;
  }

  /**
   * Sets the output filter for tasks. only those tasks are printed whose
   * output matches the filter. 
   * @param newValue task filter.
   */
  @Deprecated
  public void setTaskOutputFilter(TaskStatusFilter newValue){
    this.taskOutputFilter = newValue;
  }
    
  /**

View on GitHub (pinned to 2add963021)

Solutions

1. Add the reported jar/resource to the CLASSPATH used to launch the Hadoop command, or correct the classpath entry path.

When it happens

Trigger: Thrown at hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JobClient.java:911 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/984280a9aae6b1b0. Report an issue: GitHub.