Well, you can create javadoc out of simply the declarations
found in .class files, as with javap. Javadoc does not normally allow that,
but there may be some programs out there that do it.
Due to the following bug, Javadoc 1.4.0 actually does do that if you
put the .class files on -classpath and pass the package names in
with no source files. Let us know if it works.
http://developer.java.sun.com/developer/bugParade/bugs/4548768.html
-Doug Kramer
Javadoc team