The dom4j website currently shows links to 1.6.1, 2.0.3 and 2.1.4 releases. There are also no javadocs for 2.1.5 nor 2.2.0 in the documentation area.
I found the issue when I attempted to update the javadoc links in my DOM benchmarks page.
Incidentally, dom4j 2.2.0 performs a lot better in the benchmarks than previous versions used to, and even leads some of those related to the processing of small files.
Old elementIterator() processing a 38kB file

New elementIterator()

Old nodeIterator() processing a 38kB file

New nodeIterator()

It is still lagging behind the other implementations in the processing of larger files, but the improvement was important.