Coverage Confusion

Got it
use the following line:
- 'python /opt/cover2cover.py target/site/jacoco/jacoco.xml $CI_PROJECT_DIR/src/main/java/ > target/site/coverage.xml'

The important part is adding $CI_PROJECT_DIR/ in front of src/main/java .
This is because gitlab expects source tags like this:

And the sources from Cobertura XML with paths in the format of <CI_BUILDS_DIR>/<PROJECT_FULL_PATH>/... :

See Draft: fix: wip (!69) · Merge requests · Hannes Rosenögger / libsass-maven-plugin · GitLab for a working example.

I’ll update the documentation accordingly.