I was using Ubuntu 12.04 on VMware which I did eventually get to work. I also received a new mac os and got it running on that as well. Here are my findings:
1. I needed to use the downgraded version of maven on Ubuntu (3.0.5). I forgot to do this with my Mac installation but it just worked.
2. Instead of example.zip, use extension.zip, located in: jive-sdk-java-jersey/jive-addon/src/main/webapp/extension.zip
3. On Ubuntu you have to use cd jive-addon; mvn -DclientUrl=http://your.resolvable.host.name -Dport=8090 jetty:run without clean. Otherwise you get a huge nasty orange exception screen.