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java.lang.ClassNotFoundException: Class com.hadoop.keyword.count.ItemMapper not found	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2101)	at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2193)	at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:186)	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:745)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:415)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)