To build vfs-maven-plugin following repository has to be defined in your Maven settings.xml
<repository>
<id>maven-vfs-plugin-github</id>
<url>https://comundus.github.io/maven2-repository</url>
</repository>
This other one is possibly not needed anymore
<repository>
<id>maven2-repository.dev.java.net</id>
<name>Java.net Repository for Maven</name>
<url>http://download.java.net/maven/2/</url>
<layout>default</layout>
</repository>