I created a web application with ojdbc14.jar in lib folder.
However, when I start my tomcat I get an error:
Caused by: java.lang.ClassNotFoundExcepti
Are you sure it exists inside webapps/yourapp/WEB-INF/lib folder? It is bound to throw that exception if it can't be seen in that specific directory.
How do you deploy out of eclipse? Do you export a WAR file and deploy? Verify that your WAR file contains ojdbc14.jar in the specified location.