I think I found the answer myself. As I see, not a native maven is used, its a custom implementation called guvnor-project. Checking the source code of that project, I found that it just uses the pom.xml to parse the necessary information from it, and it builds the kjar itself, without calling any maven goal. So no plugins are running.
I solved my problem by defining a job in our Jenkins, which really builds the kjar by maven and I stop using the Build & Deploy function on the UI.