The Tomcat JDBC pool was introduced in Tomcat 7.0.19.
In case of Tomcat installation outside from Eclipse, the tomcat-jdbc.jar will missing when:
use of Tomcat Debian packages
use of Tomcat version before the 7.0.19.
In these case, add Kiwa/resources/extra-jars/tomcat-jdbc.jar in the lib folder of your already installed Tomcat.

The file name is strange, tomcat-7.0.41-jdbc.jar means it is a copy of tomcat-jdbc.jar from Tomcat 7.0.41.