No such method exception Hadoop

Question

When I am running a Hadoop .jar file from the command prompt, it throws an exception saying no such method StockKey method.

StockKey is my custom class defined for m

Answer 1

Make sure you have the default constructor, but I also had to add the static keyword to my class declaration. That is,

public class SecondarySort {
  public static void main(String[] args) {...}

  public static class StockKey extends ... {}
}