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From Todd Lipcon <t...@cloudera.com>
Subject Re: Trouble with tutorial
Date Thu, 03 Dec 2009 15:33:58 GMT
It looks like org.myorg.Wordcount isn't compiled into that jar.

I'm surmising that you might be pretty new to Java. If so, you may want to
start with Hadoop using Hadoop Streaming, which lets you write jobs using
various scripting languages.

Thanks
-Todd

On Thu, Dec 3, 2009 at 4:31 AM, Mikko Lahti <mikko.lahti@pp1.inet.fi> wrote:

>  Hey,
>
> This was indeed the case (javac was wrong version), but now i ran into
> another problem.
>
> When running the program with the line:
> bin/hadoop jar usr/joe/wordcount.jar org.myorg.WordCount
> usr/joe/wordcount/input usr/joe/wordcount/output
> the result is:
>
> Exception in thread "main" java.lang.ClassNotFoundException:
> org.myorg.WordCount
>  at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
>  at java.security.AccessController.doPrivileged(Native Method)
>  at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>  at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
>  at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>  at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
>  at java.lang.Class.forName0(Native Method)
>  at java.lang.Class.forName(Class.java:247)
>  at org.apache.hadoop.util.RunJar.main(RunJar.java:149)
>
> I'm guessing this is a classpath issue, so I tried adding the path where
> the .jar file is to the system env classpath variable, but this didn't
> help.  I also overheard that there should be a temporary classes dir in
> hadoop home, i created this and added to classpath, but this didn't work
> either.
>
> Anyone seen something similar / possible fixes?
>
> Thanks again
>
> - Mikko
>
>
> ----- Original Message -----
>  *From:* Todd Lipcon <todd@cloudera.com>
> *To:* common-user@hadoop.apache.org ; Mikko Lahti<mikko.lahti@pp1.inet.fi>
> *Sent:* Wednesday, December 02, 2009 9:03 PM
> *Subject:* Re: Trouble with tutorial
>
> Make sure you're using Java6. Hadoop is compiled with Java6, and it smells
> like you're using an earlier JDK.
>
> -Todd
>
> On Wed, Dec 2, 2009 at 11:01 AM, Mikko Lahti <mikko.lahti@pp1.inet.fi>wrote:
>
>> Hi,
>>
>> I'm trying to run the map/reduce tutorials with windows XP and cygwin.
>>
>> In the 2nd step:  javac -classpath
>> ${HADOOP_HOME}/hadoop-${HADOOP_VERSION}-core.jar -d wordcount_classes
>> WordCount.java ,  I get the following error:
>>
>> WordCount.java:6: cannot access org.apache.hadoop.fs.Path
>> bad class file: hadoop-0.19.2-core.jar(org/apache/hadoop/fs/Path.class)
>> class file has wrong version 50.0, should be 49.0
>> Please remove or make sure it appears in the correct subdirectory of the
>> classpath.
>>  import org.apache.hadoop.fs.Path;
>>                                   ^
>> 1 error
>>
>> I'm using the command:
>> javac -classpath hadoop-0.19.2-core.jar -d wordcount_classes
>> Wordcount.java
>> This is done at the root directory of Hadoop.
>>
>>
>> I also used the command with -verbose, this gets:
>>
>> [parsing started WordCount.java]
>> [parsing completed 47ms]
>> [search path for source files: [hadoop-0.19.2-core.jar]]
>> [search path for class files: [c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\rt.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\jsse.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\jce.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\charsets.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\ext\dnsns.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\ext\jmf.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\ext\localedata.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\ext\sound.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\ext\sunjce_provider.jar, c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\ext\sunpkcs11.jar, hadoop-0.19.2-core.jar]]
>> [loading c:\Program
>> Files\Java\jdk1.5.0_09\jre\lib\rt.jar(java/io/IOException.class)]
>> [loading hadoop-0.19.2-core.jar(org/apache/hadoop/fs/Path.class)]
>> WordCount.java:6: cannot access org.apache.hadoop.fs.Path
>> bad class file: hadoop-0.19.2-core.jar(org/apache/hadoop/fs/Path.class)
>> class file has wrong version 50.0, should be 49.0
>> Please remove or make sure it appears in the correct subdirectory of the
>> classpath.
>>  import org.apache.hadoop.fs.Path;
>>                                   ^
>> [total 453ms]
>> 1 error
>>
>> Running the latest stable 0.20.1 makes no difference.
>>
>> What could be wrong?
>>
>> - Mikko
>>
>>
>>
>>
>>
>

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