[MAPREDUCE-6187] DBInputFormat can't pick driver class from *-job.jar/lib - ASF JIRA

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Assume package structure:

myprocess-job.jar
 /mypackage/MyProcess.class
 /lib/ojdbc.jar

Where:
MyProcess.class sets up DbInputFormat.

If I call:

hadoop jar myprocess-job.jar mypackage.MyProcess.class

I will get ClassNotFoundException when DBConfiguration does

Class.forName(conf.get(DBConfiguration.DRIVER_CLASS_PROPERTY))

The fix may be:

conf.getClassByName(conf.get(DBConfiguration.DRIVER_CLASS_PROPERTY));