We proxied Springsource EBR in our own Nexus put a p2 capability on it so that we could use it in our p2 target platforms. Now since Springsource EBR is down the proxy doesn't work anymore. Now I got some questions:
Well... Eclipse initiated its own EBR project, which should be a clone and continuation of the former springsource EBR. Unluckily, this project seems to be dead :(
http://www.eclipse.org/ebr/
https://www.eclipse.org/forums/index.php/f/261/
As an alternative, you can try to use the Dependencies from the Apache Servicemix project, which are available at http://search.maven.org/#search|ga|1|g%3Aorg.apache.servicemix.bundles