You can find XDoclet at
http://xdoclet.sourceforge.net Maybe this question should belong to the
ANT forum since XDoclet
is really an ANT task.
Anyhow, XDoclet is primarily used to generate "boiler-plate" code.
It does this by scanning through your source for metadata information in the form of @tags (similiar to javadocs).
If this is what you are looking for, their web site can tell you more about it.
Hope this helps.