We've merged a bundled Tor client to git master, what will become bitcoinj 0.12. If you are a wallet author please help us test it out:
https://groups.google.com/forum/#!topic/bitcoinj/XlL5jJs9ur8
Enabling it is a singe line of code for most apps, but we need to find performance and correctness bugs and squash them before it can be rolled out to a large number of users.