How to combine JaCoCo reports from multiple sub projects

Question

I have a working setup for a simple SBT build but now I am dealing with a multi project build. At the moment SBT jacoco:cover produces reports inside each sub project but I would like to have an aggregate at the root level /target/scala-2.xx/jacoco.

Answer 1

Jacoco has jacoco:merge ant target which you can integrate with SBT to merge reports from subprojects.

<jacoco:merge destfile="merged.exec">
    <fileset dir="dir_common_location" includes="*.exec"/>
</jacoco:merge>

• Put individual report from each project in a common location.
• Merge those report to a single merged.exec