Upgrading JDBC driver in Fusion Middleware 11g stack

1. Download the latest version of the JDBC drivers [ojdbc6.jar and orai18n.jar ]from OTN

2. Replace the following directories with the latest ojdbc6.jar
FMW_HOME/Oracle_SOA1/inventory/Scripts/ext/jlib/ojdbc6.jar
FMW_HOME/oracle_common/inventory/Scripts/ext/jlib/ojdbc6.jar
FMW_HOME/wlserver_10.3/server/lib/ojdbc6.jar
FMW_HOME/wlserver_10.3/server/adr/ojdbc6.jar

Make sure you take a backup of ojdbc6.jar from any one of the directories above

3. Replace the following directories with the latest orai18n.jar
FMW_HOME/oracle_common/modules/oracle.nlsrtl_11.1.0/orai18n.jar
FMW_HOME/wlserver_10.3/server/ext/jdbc/oracle/11g/orai18n.jar

Make sure you take a backup of orai18n.jar from any one of the directories above

4. Restart WebLogic Server and test your data source.

Note: 
a. The above change was tested on Fusion Middleware 11g ps5
b. FMW_HOME as defined in Fusion Middleware Directory Structure