This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
In the case of the Oracle driver, you're missing the class in your classpath, as was suggested before. In the case of the JDBC/ODBC bridge, it sounds like the URL you're using to access the DB is incorrect.