Classes in src/main not analyzed

[hackklotz]

Plugin works, but adds only classes included from dependencies to the diagram. Java classes, which are not imported via dependencies and reside in src/main folder are missing.
I thought following setting should enable expected behavior:
true
Do I also have to set another property to get it run?
Thanks a lot!

Full configuration:
<plugin> <groupId>com.iluwatar.urm</groupId> <artifactId>urm-maven-plugin</artifactId> <version>2.1.1</version> <configuration> <outputDirectory>${project.basedir}/target/urm</outputDirectory> <packages> <param>de.company</param> </packages> <includeMainDirectory>true</includeMainDirectory> <includeTestDirectory>false</includeTestDirectory> <presenter>graphviz</presenter> </configuration> <executions> <execution> <phase>process-classes</phase> <goals> <goal>map</goal> </goals> </execution> </executions> </plugin>