Run a non-default main function from jar file

#insight

# java -cp your-jar.jar full-class-path
java -cp multifleet-planner-1.0-SNAPSHOT.jar com.greyorange.multifleetplanner.JsonTest

mvn -pl multifleet-planner exec:java -Dexec.mainClass="com.greyorange.multifleetplanner.JsonTest" -Dexec.args="true"