asm 3 generates java 7 incompatible classes. We need to upgrade to asm 4 to be able to support running on java 7. There are a few simple code changes needed in the proxy module, and a couple nasty workarounds for newly final methods and private fields. There is also a lot of work in integration tests and pom versions to make everything else work.
I plan to add patches here as I proceed and when everything works I'll think about committing.