A few days ago I 'finished' the proper rhug integration of Ant and the java bytecode compiler hidden within Eclipse. When built with gcj, I believe we end up with the absolute fastest java bytecode compiler in the world (yes, faster than jikes). gary was speechless.
Unfortunately, it requires a little tweak to GCC. If you're tenacious, or jh-build enabled, then you should be able to enjoy ecj yourself.
