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Probably eclim

But eclim lets you get Eclipse features in vim, not vice versa... is there something I'm missing here?

It also allows you to use vim in eclipse when editing a file.

I use and recommend vrapper

I use http://www.viplugin.com/index.htm . It costs 19$ and it is worth it. When it lacks some vim feature -- there is an easy way to invoke the real vim, do some editing there, and then swith to eclipse back.

I tried eclim but it lacked too many eclipse features. It is maybe that I didn't try it enough, but I was (and still am) happy with viplugin to really try something else.