I have just uploaded version 0.02 of java2perl6 to CPAN (the dist is called Java::Javap in honor of the Java deparser).
The new version has one important bug fix (qualified module names are now qualified for Perl instead of java in generated perl code). But, mostly it has a working java2perl6 command line tool. The only flag not implemented is --recurse which will eventually recursively visit class files discovered in the class you specify on the command line (and the ones it finds in those...).
I also added a check to the tests so they won't run if javap is not in the installing user's path. Surprisingly enough many of the CPAN testers don't have Java development kits installed.
Update: Corrected spelling of missing flag name (nest already works, recurse is not in yet).