Refrence to the previously asked question Oozie + Sqoop: JDBC Driver Jar Location 1 but not able to find jar in HDFS /user/oozie/share/lib/sqoop location.
I have also tried to put driver jars at my workFlow app Lib. Still Drivers not found error occure.
You need to add all lib files like jdbc drivers, etc in the oozie share lib folder inside sqoop folder .
This should resolve your issue.
To check the library files invoked/used by the job , go to the job tracker for the corresponding job and in syslogs you will see which all jars has been used.