mapreduce - MapReduce Java Program Error: java.lang.RuntimeException

Question

I have run a MapReduce java program and run in Hadoop. I have not set some configuration right and I don't get my error. I tried with various workarounds but I get similar errors repeatedly.

Answer 1

你必须让你的映射器和减速器public：

public static class AnnualTaxCalculaterMapper
public static class AnnualTaxCalculaterReducer

Hadoop API 无法访问package-private类。