Excuse me for going into your thread but I have observed serious faults on Z6000 using Jikes. Most specially when compiling quite big applications that use a lot of numbers, "double numbers".
It is simply totally faulty. On the contrary, with jdk1.1.8 from blackdown everything runs smoothly with exactly the same results, up to five digits, than in a "big" desktop and running Java5.
Perhaps I am doing something stupid with Jikes, but I've tried many times, compiling and/or downloading it. :-(
Smuelas