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From "Mikko Lahti" <mikko.la...@pp1.inet.fi>
Subject Re: Trouble with tutorial
Date Thu, 03 Dec 2009 12:31:29 GMT
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 
  To: common-user@hadoop.apache.org ; Mikko Lahti 
  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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