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 <ama...@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 >
