Pentaho Common Errors : Driver class 'oracle.jdbc.driver.OracleDriver' could not be found

Error Message

Error connecting to database [ORA_TEST_JDBC] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Driver class 'oracle.jdbc.driver.OracleDriver' could not be found, make sure the 'Oracle' driver (jar file) is installed.
oracle.jdbc.driver.OracleDriver

org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Driver class 'oracle.jdbc.driver.OracleDriver' could not be found, make sure the 'Oracle' driver (jar file) is installed.
oracle.jdbc.driver.OracleDriver
Caused by: java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
 at java.net.URLClassLoader$1.run(Unknown Source)
 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 java.lang.ClassLoader.loadClass(Unknown Source)
 at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:467)

Resolution

1) Download latest oracle jdbc driver.

http://www.oracle.com/technetwork/database/enterprise-edition/jdbc-112010-090769.html
ojdbc6 used here for demo purpose.

2) Copy "ojdbc6.jar" to folder
    /pentaho/server/data-integration-server/tomcat/webapps/pentaho-di/WEB-INF/lib/

3) Copy "ojdbc6.jar" to folder
    /pentaho/design-tools/data-integration/lib

4) Restart Spoon.