using maven exec to run a class in a multi module maven setup

Developer from somewhere

Had the following structure:

project/
  tests/
    pom.xml
    integration-tests/
      pom.xml
      src
        test
          java
            Potato.java
...

and I wanted to run the Potato class using maven exec. The following command did the trick:

mvn -Dexec.mainClass="my.pkg.Potato" -Dexec.classpathScope=test exec:java -pl tests/integration-tests