I don't quite understand how you came to rely on these artifacts.
They do not belong to Alfresco, and I don't think they were supposed to be served by us on the first place.
Do some Alfresco artifacts depend on them?
I can indeed find some traces of them on our Nexus server, for instance here:
But this is just a SHA1 and MD5 – we don't even have this artifact any more.
However, I can find the artifact you're looking for at SpringSource :
I think what happened is the following: we used to proxy (i.e. mirror) quite a few SpringSource Maven repositories on Nexus, for some historical reasons.
I put these proxies out of service one year ago – so they were not available through our servers any more.
Finally, I deleted these proxies 2 months ago (BDE-1050), which means we don't have the artifacts any more.
Since I'm an organised person I wrote down the URLs we were proxying. Hopefully, you'll be able to find these artifacts you need in one of them:
Hope this helps