There are several "subpolicies" in Debian. They all want to make the Debian Policy more precise when it comes to a specific subject. See the Emacs subpolicy in package emacsen-common for instance. As far as I know, the only subpolicy for a programming language, is that of Perl.
Feel free to report comments, suggestions and/or disagreements to the
java-common package (
or the Debian Java mailing list
<firstname.lastname@example.org>. Change requests should be
sent as a bug to the java-common package.