Add the following fragment to your pom file to execute the aid plugin as part of the "generate-sources" phase.
<project> ... <build> <plugins> <plugin> <groupId>org.freehep</groupId> <artifactId>freehep-aid-plugin</artifactId> <version>2.0-SNAPSHOT</version> <executions> <execution> <goals> <goal>generate</goal> </goals> <configuration> <targetDirectory>${basedir}/src/main/java</targetDirectory> <timestampDirectory>${project.build.directory}/generated-sources/aid</timestampDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build> ... </project>