java.lang.RuntimeException: java.lang.NoSuchMethodException: com.google.hadoop.examples.Simple$MyMapper.()

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Root Cause Analysis

  1. java.lang.NoSuchMethodException

    com.google.hadoop.examples.Simple$MyMapper.()

    at java.lang.Class.getConstructor0()
  2. Java RT
    Class.getDeclaredConstructor
    1. java.lang.Class.getConstructor0(Class.java:2705)
    2. java.lang.Class.getDeclaredConstructor(Class.java:1984)
    2 frames
  3. Hadoop
    ReflectionUtils.newInstance
    1. org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:41)
    1 frame
  4. Hadoop
    MapRunner.configure
    1. org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:32)
    1 frame
  5. Hadoop
    ReflectionUtils.newInstance
    1. org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:53)
    1 frame
  6. Hadoop
    TaskTracker$Child.main
    1. org.apache.hadoop.mapred.MapTask.run(MapTask.java:209)
    2. org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1210)
    2 frames