Mapreduce job failing even the required class is present - hadoop

Question

Hi my job is failing due to runtime exception, saying, mapper class not found.
Below is the exception:
14/06/16 05:52:56 INFO mapred.JobClient: Task Id : attempt_201406071432_1142_m_000028_0, Status : FAILED
java.lang.RuntimeException: java.lang.ClassNotFoundException: Class com.cloudera.sa.omniture.mr.OmnitureRawDataMapper not found
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1774)
at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:191)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:631)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)
at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408)
at org.apache.hadoop.mapred.Child.main(Child.java:262)
Caused by: java.lang.ClassNotFoundException: Class com.cloudera.sa.omniture.mr.OmnitureRawDataMapper not found
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1680)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1772)
... 8 more
But in my jar i used to run the job had the Mapper class present, still i am facing the issue. pls guide.
Below info. on my jar file confirms the presence of Mapper class in jar file.
[svtdphpd#d-hcr75y1 testJARs]$ jar tvf MalformedAnalysis.jar | grep Omniture
1405 Mon Jun 16 15:59:34 CDT 2014 com/cloudera/sa/omniture/mr/OmnitureRawDataMapper$HITDATA_PROBLEM.class
3728 Mon Jun 16 15:59:34 CDT 2014 com/cloudera/sa/omniture/mr/OmnitureRawDataMapper.class
5280 Mon Jun 16 16:00:46 CDT 2014 com/cloudera/sa/omniture/mr/OmnitureToRCFileJob.class
6436 Mon Jun 16 16:03:34 CDT 2014 com/cloudera/sa/omniture/mr/OmnitureDataFileRecordReader.class
3642 Mon Jun 16 16:00:16 CDT 2014 com/cloudera/sa/omniture/mr/OmnitureRawDataReducer.class
1792 Mon Jun 16 15:59:34 CDT 2014 com/cloudera/sa/omniture/mr/OmnitureDataFileInputFormat.class
Below is the Job configuration:
// Create job
Job job = Job.getInstance(config, "LoadOmnitureData");
job.setJarByClass(OmnitureToRCFileJob.class);
// Add named output for malformed records
MultipleOutputs.addNamedOutput(job, "Malformed",
TextOutputFormat.class, NullWritable.class, Text.class);
FileInputFormat.addInputPath(job, new Path(inputPath));
job.setInputFormatClass(OmnitureDataFileInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
job.setOutputKeyClass(NullWritable.class);
job.setOutputValueClass(Text.class);
job.setReducerClass(OmnitureRawDataReducer.class);
job.setMapperClass(OmnitureRawDataMapper.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
TextOutputFormat.setOutputPath(job, new Path(outputPath));
job.setNumReduceTasks(numReduceTasks);