The kie-maven-plugin fails to build a KieBase when it uses a custom operator defined in the projects' kmodule.xml.

As far as I can tell, it seems like the kie-maven-plugin is not even using the project's kmodule.xml but it is using a predefined one.

The same project works when using Drools 6.5.

I'm attaching a simple project showing this problem. The project won't build when using version 7.9 but it will work fine then using version 6.5. Just unzip the .zip file and run mvn clean package