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From imcaptor <imcap...@gmail.com>
Subject Re: Hadoop0.20 - Class Not Found exception
Date Sat, 27 Jun 2009 01:58:25 GMT
I meet the question also, resolved by transfer a class name to JobConf
constructor.

If you new the

*JobConf,you must transfer a class name to it.*


2009/6/27 Amandeep Khurana <amansk@gmail.com>

> I'm getting the following error while starting a MR job:
>
> Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException:
> oracle.jdbc.driver.OracleDriver
>    at
>
> org.apache.hadoop.mapred.lib.db.DBInputFormat.configure(DBInputFormat.java:297)
>    ... 21 more
> Caused by: java.lang.ClassNotFoundException:
> oracle.jdbc.driver.OracleDriver
>    at java.net.URLClassLoader$1.run(Unknown Source)
>    at java.security.AccessController.doPrivileged(Native Method)
>    at java.net.URLClassLoader.findClass(Unknown Source)
>    at java.lang.ClassLoader.loadClass(Unknown Source)
>    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
>    at java.lang.ClassLoader.loadClass(Unknown Source)
>    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
>    at java.lang.Class.forName0(Native Method)
>    at java.lang.Class.forName(Unknown Source)
>    at
>
> org.apache.hadoop.mapred.lib.db.DBConfiguration.getConnection(DBConfiguration.java:123)
>    at
>
> org.apache.hadoop.mapred.lib.db.DBInputFormat.configure(DBInputFormat.java:292)
>    ... 21 more
>
> Interestingly, the relevant jar is bundled into the MR job jar and its also
> there in the $HADOOP_HOME/lib directory.
>
> Exactly same thing worked with 0.19.. Not sure what could have changed or I
> broke to cause this error...
>
> Amandeep
>
>
> Amandeep Khurana
> Computer Science Graduate Student
> University of California, Santa Cruz
>

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