Java team tool for semi-automatic creation of ebuilds from pom.xml.
Java-ebuilder is available in gentoo as app-portage/java-ebuilder.
emerge app-portage/java-ebuilder
Edit /etc/java-ebuilder.conf to add the artifact you want to MAVEN_ARTS, separated by space.
Run movl build
To start over, run movl clean
first.