Jacoco Maven multi module project coverage

Question

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

Answer 1

One problem in multimodule projects is caused, if the aggregator pom is used as parent pom for the modules either, like it is the case in the above example:

- parentAggregator pom
---sub module A pom.xml -> parentAggregator pom
---sub module B pom.xml -> parentAggregator pom
---sub module C pom.xml -> parentAggregator pom

In this case, the build order is:

- parentAggregator
- sub module A
- sub module B
- sub module C

which means, that the parent aggregator can not collect complete information. In my case a transfer of data into sonarQube by mvn sonar:sonar resulted in unexpected and uncomplete results.

Changing the module structure to:

- aggregator pom
-- parent pom
---sub module A pom.xml -> parent pom
---sub module B pom.xml -> parent pom
---sub module C pom.xml -> parent pom

will change the build order to:

- parent
- sub module A
- sub module B
- sub module C
- aggregator

In this case aggregator will be the last one and work with the results of the modules. In my case the results in SonarQube were like expected.