Sunday, June 26, 2011

java.lang.ClassNotFoundException: WordCount$Map

Today I was trying to run mapreduce wordcount code on my eclipse, I copied code from here http://wiki.apache.org/hadoop/WordCount
but with this I was getting following error,
java.lang.RuntimeException: java.lang.ClassNotFoundException: WordCount$Map

after bit of googling I found
add the commented line below
Job job = new Job(conf, "wordcount");
//job.setJarByClass(WordCount.class);

Now its working :)
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11 comments:

  1. AlexDecember 20, 2011 at 6:41 AM

    I added it and still have this issue .... :\

    ReplyDelete
  2. Sagar SugandhiMarch 17, 2012 at 11:22 AM

    Thanks, this solved the problem.

    ReplyDelete
    Replies
    1. chunApril 4, 2012 at 10:42 AM

      This comment has been removed by the author.

      Delete
  3. kkara353September 10, 2012 at 12:20 AM

    Thanks.It worked for me.

    ReplyDelete
  4. BezgoanJanuary 16, 2013 at 3:47 PM

    voila...it works!!!. Not sure why there is no documentation on this in WC pgm.

    ReplyDelete
  5. SkandyMarch 20, 2013 at 6:33 AM

    Thanks !
    It worked.

    ReplyDelete
  6. UnknownMay 26, 2013 at 1:53 AM

    Thanks after a horrible sunday morning debuging the things finally it worked !!

    ReplyDelete
  7. Kamal SharmaJuly 2, 2013 at 11:09 AM

    still not working

    ReplyDelete
  8. SaurabhJuly 15, 2013 at 12:11 AM


    Job job = new Job(conf, "wordcount");
    job.setJarByClass(WordCount.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);



    Added the above snip and worked for me!
    Thanks

    ReplyDelete
  9. talakhanoomSeptember 24, 2013 at 12:47 PM

    Thanks for your post. For those who say does not work, do not forget to compile your java file again and build your jar again :)

    ReplyDelete
  10. UnknownJanuary 26, 2015 at 11:40 PM

    even i tried with job.setJarByClass(PdfInputDriver.class); method but it didn't worked

    MyPdfProject.jar jar exported from eclipse,its working perfect in eclipse.

    Error:-
    java.lang.RuntimeException: java.lang.ClassNotFoundException: WordCountMapperr


    terminal:-

    export LIBJARS=/home/devendar/Desktop/pdf external jars/fontbox-1.3.1.jar,/home/devendar/Desktop/pdf external jars/pdfbox-1.2.0.jar;

    export HADOOP_CLASSPATH=/home/devendar/Desktop/pdfexternaljars/fontbox-1.3.1.jar:/home/devendar/Desktop/pdfexternaljars/pdfbox-1.2.0.jar;

    hadoop jar MyPdfProject.jar -libjars ${LIBJARS} /usr/data/Input/DCPD-201400050.pdf /usr/data/output/outppput



    please help me in solving this issue

    ReplyDelete

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