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From Hemanth Yamijala <yhema...@thoughtworks.com>
Subject Re: ClassNotFoundException in Main
Date Tue, 19 Feb 2013 16:40:03 GMT
I am not sure if that will actually work, because the class is defined to
be in the org.myorg package. I suggest you repackage to reflect the right
package structure.

Also, the error you are getting seems to indicate that you aphave compiled
using Jdk 7. Note that some versions of Hadoop are supported only on Jdk 6.
Which version of Hadoop are you using.

Thanks
Hemanth

On Tuesday, February 19, 2013, Fatih Haltas wrote:

> Thank you very much.
> When i tried with wordcount_classes.org.myorg.WordCount, I am getting the
> following error:
>
> [hadoop@ADUAE042-LAP-V project]$ hadoop jar wordcount_19_02.jar
> wordcount_classes.org.myorg.WordCount
> /home/hadoop/project/hadoop-data/NetFlow 19_02_wordcount.out
> Warning: $HADOOP_HOME is deprecated.
>
> Exception in thread "main" java.lang.UnsupportedClassVersionError:
> wordcount_classes/org/myorg/WordCount : Unsupported major.minor version 51.0
>         at java.lang.ClassLoader.defineClass1(Native Method)
>         at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
>         at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
>         at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
>         at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
>         at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
>         at java.lang.Class.forName0(Native Method)
>         at java.lang.Class.forName(Class.java:266)
>         at org.apache.hadoop.util.RunJar.main(RunJar.java:149)
>
>
>
> On Tue, Feb 19, 2013 at 8:10 PM, Hemanth Yamijala <
> yhemanth@thoughtworks.com> wrote:
>
> Sorry. I did not read the mail correctly. I think the error is in how the
> jar has been created. The classes start with root as wordcount_classes,
> instead of org.
>
> Thanks
> Hemanth
>
>
> On Tuesday, February 19, 2013, Hemanth Yamijala wrote:
>
> Have you used the Api setJarByClass in your main program?
>
>
> http://hadoop.apache.org/docs/r1.0.4/api/org/apache/hadoop/mapreduce/Job.html#setJarByClass(java.lang.Class)
>
> On Tuesday, February 19, 2013, Fatih Haltas wrote:
>
> Hi everyone,
>
> I know this is the common mistake to not specify the class adress while
> trying to run a jar, however,
> although I specified, I am still getting the ClassNotFound exception.
>
> What may be the reason for it? I have been struggling for this problem
> more than a 2 days.
> I just wrote different MapReduce application for some anlaysis. I got this
> problem.
>
> To check, is there something wrong with my system, i tried to run
> WordCount example.
> When I just run hadoop-examples wordcount, it is working fine.
>
> But when I add just "package org.myorg;" command at the beginning, it
> doesnot work.
>
> Here is what I have done so far
> *************************************************************************
> 1. I just copied wordcount code from the apaches own examples source code
> and I just changed package decleration as "package org.myorg;"
> **************************************************************************
> 2. Then I tried to run that command:
>  *************************************************************************
> "hadoop jar wordcount_19_02.jar org.myorg.WordCount
> /home/hadoop/project/hadoop-data/NetFlow 19_02_wordcount.output"
> *************************************************************************
> 3. I got following error:
> **************************************************************************
> [hadoop@ADUAE042-LAP-V project]$ hadoop jar wordcount_19_02.jar
> org.myorg.WordCount /home/hadoop/project/hadoop-data/NetFlow
> 19_02_wordcount.output
> Warning: $HADOOP_HOME is deprecated.
>
> Exception in thread "main" java.lang.ClassNotFoundException:
> org.myorg.WordCount
>         at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
>         at java.lang.Class.forName0(Native Method)
>         at java.lang.Class.forName(Class.java:266)
>         at org.apache.hadoop.util.RunJar.main(RunJar.java:149)
>
> **************************************************************************
> 4. This is the content of my .jar file:
> ****************************************************
> [hadoop@ADUAE042-LAP-V project]$ jar tf wordcount_19_02.jar
> META-INF/
> META-INF/MANIFEST.MF
> wordcount_classes/
> wordcount_classes/org/
> wordcount_classes/org/myorg/
> wordcount_classes/org/myorg/WordCount.class
> wordcount_classes/org/myorg/WordCount$TokenizerMapper.class
> wordcount_classes/org/myorg/WordCount$IntSumReducer.class
> **********************************************************
> 5. This is the 'ls' output of my working directory:
> *******************************************************
>
>

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