Hi @hockleya,
I assume you want to run your process on a constainer managed engine installed on a tomcat server: https://docs.camunda.org/manual/7.8/introduction/architecture/#shared-container-managed-process-engine
For this you have to seperate the process implementation from the incident handling. The process application should be packaged as a war file, the process engine plugin should be packaged as a jar file.
In Tomcat you have to deploy the process application as a normal war file. To run the process engine plugin you should copy the jar file into tomcat/lib folder and adjust the bpm-config.xml as you did it already.
Hope this helps,
Ingo