This library implements BIP 120 (https://github.com/bitcoin/bips/blob/master/bip-0120.mediawiki) and BIP 121 (https://github.com/bitcoin/bips/blob/master/bip-0121.mediawiki). It depends on bitcoinj, but with scope provided, so that it's not interfering with the users' version of bitcoinj.
It's been tested so far with bitcoinj 0.13.3.