To use the Flex Maven Reports in your application you need to add this plugin repository in your pom.xml :

<pluginRepository>
                        <id>flex-mvn-report-repository</id>
                        <url>http://flex-mvn-report.sourceforge.net</url>
                        <releases>
                                <enabled>false</enabled>
                        </releases>
                        <snapshots>
                                <enabled>true</enabled>
                        </snapshots>
</pluginRepository>