Seems like there are couple of questions, which are quite old and things changed from Java 8 support of Jacoco.
My Project contains following structure
Copy the code end of article at https://dzone.com/articles/jacoco-maven-multi-module and put it in .... works for me. Just add as many modules as you would like to report on. Also I needed to change antrun from 1.7 to 1.8 for the ant tasks to run.