Class WordCount$MyMapper not found

17/04/18 14:40:49 WARN mapreduce.JobResourceUploader: No job jar file set.  User classes may not be found. See Job or Job#setJar(String).

Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class WordCount$MyMapper not found

 

 

解决办法：

job.setJarByClass(WordCount.class);