Google AdWords API advisor writes at Google Groups that the Java client library (version 2.0.0) has been released at http://code.google.com/p/google-api-adwords-java/.
Version 2.0.0 has some major fixes. It removes support from v11 and updates the default version to v12, and there's also a document fix to remove the reference to "clientEmail" from AdWordsUser.
If you encounter any issues, you can always make updates to the list here.
Forum discussion continues at Google Groups.
