You would need data mapper runtimes also on the container you're running application in. Data mapper
uses Clover engine
runtimes. Mule EE
container is equipped with it.
As, Data Mapper is an enterprise only feature and you'd have Mulesoft support if you're planning to use it, its best to log a ticket with them. In my experience you won't be able to successfully deploy application in tomcat for data mapper feature without add-ons