There are a couple of broken links on the hosted/published single html page version.

From this page:
http://jboss.org/file-access/default/members/resteasy/freezone/docs/1.1.GA/userguide/html/index.html you are shown a link to http://jboss.org/file-access/default/members/resteasy/freezone/docs/1.1.GA/userguide/html/Using__Path_and__GET___POST__etc..html

This http server barfs at this, presumably because the file extension is "..html" (note the double dot).

Taking a quick look at the source code, it seems that the file docbook\reference\en\modules\Using_Path.xml contains a chapter reference that ends with a "." (Full stop). When docbook builds, the result is the poorly named HTML file.