As promised in this thread I would like to share my MipmapBloomFilter with you.
I would like to invite you to test it. It works fine for me under JME 3.1, however there is a problem with JME 3.0 and with anti aliasing, that I am unable to reproduce. Tell me if it works for you and feel free to make your suggestions, especially if it does not work as expected. Have a nice day!