Add the following fragment to your pom file to execute the one plugin as part of the "generate-resources" phase.
<project> ... <build> <plugins> <plugin> <groupId>org.freehep</groupId> <artifactId>freehep-one-plugin</artifactId> <executions> <execution> <goals> <goal>generate-dependencies</goal> </goals> </execution> </executions> </plugin> </plugins> </build> ... </project>