Recursive Target directories are created in tutorial sub modules

The first time I run "mvn" in tutorial/domain, the target directory gets created.

The second time I execute "mvn" a new target directory gets created within target/classes.

For each subsequent execution of "mvn" a new target directory gets created in the deepest classes directory.

I have detected the same behavior in some other modules of tutorial as well (e.g., assets and store-merger). Therefore, I guess all the tutorial modules have the same bug.