I am running the 3.1.1 version of eclipse with the wtp all-in-one release. The hibernate plugin is 3.1.0.beta2.
I was playing with the xdoclet support and trying to play with the code completion. It shows me the code complete options for the various hibernate tags (e.g.: I get a dropdown list for completions of "hibernate.i" showing both "id" and "index-many-to-many"). However, unlike every other code assist in eclipse, if I select one, it does nothing. If I complete "id" manually, I can then do another code-complete, and it shows several options. I choose "generator-class" and it gives me: generator-class = "" and places the cursor between the quotes. I request code-assist and it gives me options. I choose "native", but as with "id", it won't fill it in. So I can see my options, but I sometimes have to type them in by hand. Is this just not working yet, or am I doing something wrong?

hibernate tools does not provide any code completion for xdoclet.

jbosside does though.