you should publish an old artifact (org.torquebox.mojo) with relocation information
The new location is
<extensions>
<extension> <!-- this allows us to download gems -->
<groupId>org.jruby.maven</groupId>
<artifactId>mavengem-wagon</artifactId>
<version>2.0.2</version>
</extension>
</extensions>
you should publish an old artifact (org.torquebox.mojo) with relocation information
The new location is